6 - mepcon

Transcription

6 - mepcon

Conference Program, MEPCON'14, Cairo, Egypt.
December 23-25, 2014
MEPCON’2014 FINAL PROGRAM
December 23-25, 2014, Cairo, Egypt
Tuesday, December 23, 2014
Time
Activity
Title
Hall
08:00– 09:00 am
Registration
09:00– 09:30 am
Opening Ceremony
Donia
09:30– 10:15 am
Keynote Lecture I
Donia
10:15– 10:30 am
Coffee Break
Farah
10:30– 11:15 am
Keynote Lecture II
Donia
11:15– 12:15 pm
Industry Co. Session
Donia
12:15– 12:45 pm
Coffee Break
Farah
12:45– 14:30 pm
Session M1
Synchronous Machines
Bern
12:45– 14:30 pm
Session PE1
Wind/Wave Energy Conversion Systems
Basel
12:45– 14:30 pm
Session HV1
Insulators Performance
Zurich_1
12:45– 14:30 pm
Session PS1
Power System Planning
Zurich_2
14:30– 15:45 pm
Lunch
15:45– 17:30 pm
Session M2
Induction Machines
Bern
15:45– 17:30 pm
Session PE2
Photovoltaic Interface Systems
Basel
15:45– 17:30 pm
Session HV2
Corona& Partial Discharge
Zurich_1
15:45– 17:30 pm
Session PS2
Power System Operation
Zurich_2
Wednesday, December 24, 2014
09:00– 11:00 am
Session M3
Special Machines
Bern
09:00– 11:00 am
Session PE3
DC/AC& DC/DC Conver ter s
Basel
09:00– 11:00 am
Session HV3
EM Fields& Envir onment
Zurich_1
09:00– 11:00 am
Session PS3
Load Fr equency Contr ol
Zurich_2
11:00– 11:30 am
Coffee Br eak
11:30– 13:30 pm
Session M4
Electr ical Dr ives
Bern
11:30– 13:30 pm
Session PE4
Matr ix Co nver ter s
Basel
11:30– 13:30 pm
Tutor ial
Smar t Gr id
Zurich_1
11:30– 13:30 pm
Session PS4
Power System Dynamics and Stability
Zurich_2
13:30– 15:15 pm
Lunch
15:15– 17:15 pm
Session RE1
Photovoltaic System
Bern
15:15– 17:15 pm
Session PE5
Applications of Power Electr onics
Basel
15:15– 17:15 pm
Session PR1
Line Fault Locator s
Zurich_1
15:15– 17:15 pm
Session PS5
Power Quality
Zurich_2
Farah
Electrical Power& Machines Dept., Ain Shams Univ.
| page 10
Thur sday, December 25, 2014
09:00– 11:00 am
Session RE2
Wind Systems Integr ation
Bern
09:00– 11:00 am
Session DS1
Distr ibuted Gener ation Planning
Basel
09:00– 11:00 am
Session PR2
Fault Detection & Line Pr otection
Zurich_1
09:00– 11:00 am
Session PS6
FACTS Planning & Control
Zurich_2
11:00– 11:30 am
Coffee Br eak
11:30– 13:30 pm
Session RE3
Hybr id Renewable Ener gy Systems
Bern
11:30– 13:30 pm
Session DS2
Analysis of Distr ibution System
Basel
11:30– 13:30 pm
Session PR3
Adaptive Protection
Zurich_1
11:30– 13:30 pm
Session PS7
FACTS & Stability Enhancement
Zurich_2
13:30– 15:15 pm
Lunch
15:15– 17:00 pm
Panel Discussion
Energy Status: Challenges& Per spectives
Donia
17:00 – 17:15 pm
Closing Cer emony
Farah
Donia
| page 11
9:30-10:15 am
Donia Hall
Keynote Lecture I
Chairmen:
Prof. Dr. Aly Kamel El Kharashi
Prof. Dr. M. Abdel-Latif Badr
Ain Shams University
“Solar Thermal Power Stations as a promising substitute to fossil
fuel for electricity supply security in Egypt”
Dr.-Ing. Hani El Nokraschy
Nokraschy Engineering GmbH
An de Masch 24 D-25488 Holm (Hamburg)
Keynote Lecture I
ABSTRACT
The current electricity crisis in Egypt caused mainly by shortage of fuel must
be seen as a part of the challenges facing Egypt in the near future. Another
equally severe challenge is the shortage of water, mainly for food production.
Population growth forces the people, especially those living outside the large
cities to build homes on the fertile land, thus increasing the damage imposed
on the land and gradually reducing the available fertile area for food
cultivation. A global solution can be reached when new settlements are built
outside the Nile valley, for example beside the sea shore. These settlements
shall be powered by air cooled solar thermal power stations and use their
waste heat for seawater desalination.
Egypt has a unique advantage of sunshine nearly all the year with direct
sunrays. Solar thermal power stations concentrate the direct sunrays on a
focus to get a high temperature for heating water to have steam for driving a
conventional steam turbine. In contrast to photovoltaic, this technology
allows to store a share of the heat collected during the day to use it in the
night, thus assuring day and night operation and supply of electricity on
demand. A special feature is hybridization to bridge 2-4 days of sand storms
at minimal costs. A standard Egyptian design shall allow mass production of
small units, 20 and 50 MW, to be manufactured in Egypt using air cooled
condensers to minimize water use and simultaneously allow seawater
desalination with the waste heat at minimal costs.
| page 12
10:30-11:15 am
Donia Hall
Keynote Lecture II
Chairman:
Prof. Dr. Soliman M. El-Debeiky
“Holistic Understanding of Electric Grid Performance”
Abdel-Aty Edris
Sr. Manager at Exponent, Inc. in Menlo Park, California, USA
CONTENTS
Keynote Lecture II
 Electric Grid Complexity
• Smart Grid: Key Characteristics, Driving Factors and Influences, Key
Considerations, etc
• Integration of Renewable energy Resources
• Energy Storage
• Find the Right Transmission Technologies, Dynamic Thermal Circuit
Ratings, Flexible AC Transmission System (FACTS), High Voltage Direct
Current (HVDC) Transmission Technologies, Line Commutated
and Voltage Sourced Converter based Technologies
• Wide Area Monitoring Protection and Control, from SCADA to
Synchrophasor technologies
| page 13
11:15-12:15 am
Donia Hall
Industry Firms Session
Chairman:
Prof. Dr. Ahmed Rizk Abul'Wafa
11:15- 11:30
Industry Firms Session
Elswedey Electric Presentation
11:30- 11:45
SEGA. M Presentation
11:45- 12:00
ABB Presentation
12:00- 12:15
Schneider Electric Presentation
| page 14
12:45 pm – 14:30 pm
Bern Hall
Session M1: Synchronous Machines
Chairmen:
Prof. Dr. Farouk Ismail
Prof. Dr. M. Abdel-Latif Badr
Prof. Dr. Hussein F. Soliman
Cairo University
M1: Synchronous Machines
1/6
(#018) Effect of Rotation Speed on the Cooling of Starter Alternator Machine
Hamdy HASSAN
Souad HARMAND
Assiut University, Egypt
Université Lille Nord de France, France
ABSTRACT
This paper presents a study on the effect of rotation speed on the temperature distribution
of starter alternator machine. The effect of the outer conditions of the machine on its
temperature is also studied. The numerical solution of the thermal model of the machine is
solved using a nodal approach during a numerical code (SAME) established at our laboratory
and is written by MATLAB. The results show that when the rotation speed of the machine
increases, the temperature of the machine increases. They also show that increase the
rotation speed of the machine more than five times, increase the power loss from the
machine three times and the maximum temperature difference of the machine by about
40%.
(#54)
1B
Cost Effective Real Time Embedded Control System for Interior
Permanent Magnet Synchronous Motors
Ahmed M. Omara, Mohamed K. El-Nemr, and Essam M. Rashad
Department of Electrical Power& Machines Engineering, Tanta University, Egypt
2/6
54B
ABSTRACT
82B
In this paper, a low cost experimental implementation of a real time speed control system
for interior permanent magnet synchronous motor (IPMSM) is presented. Such control
system requires fast response and suitable digital features of microcontroller unit (MCU).
Moreover, it necessitates the intrinsic computationally powerful abilities of a digital signal
processor (DSP). Therefore a creative solution is needed in order to minimize cost.
Accordingly, a proper digital signal controller (DSC) has been selected. It is a microcontroller
with DSP engine that enhances computational abilities. The firmware is developed in C
programming language integrated with assembly mnemonics. It is optimized to have a good
utilization of the DSC resources with reasonable CPU load. Due to its digital nature, space
vector pulse width modulation (SVPWM) technique has been adopted and implemented to
get variable voltage and frequency according to scalar control (constant V/f) algorithm.
Motor parameters are experimentally determined for modeling and performance analysis.
The experimental results show that the proposed drive system has a worthy dynamic
response and well tracking of the speed trajectory in a wide speed range and in both
directions of rotation.
| page 15
(#057) Analysis
of Wind Turbine Driven Permanent Magnet
Synchronous Generator under Different Loading Conditions
3/6
Gaber El-Saady,
El-Nobi A.Ibrahim, Hamdy Ziedan and
Mohammed M. Soliman
Electrical Engineering Department, Assiut University, Egypt
5B
ABSTRACT
This paper proposes the configuration of a wind turbine generating system
equipped with permanent magnet synchronous generator (PMSG). There are
different types of synchronous generators, but the PMSG is chosen in order to
obtain its model. It offers better performance due to higher efficiency and less
maintenance since it does not have rotor current and can be used without a
gearbox, which also implies a reduction of the weight of the nacelle and a
reduction of costs. Wind turbine and drive train have been modelled and the
equations that explain their behaviour have been introduced. The generator
model is established in the dq – synchronous rotating reference frame. The
PMSG is operating in stand-alone which is loaded with different types of loads.
The proposed system has been implemented in MATLAB/SIMULINK software.
83B
(#170) Control
3B
Scheme of Five-Phase PMSG Based Wind Turbine
for Utility Network Connection
Abdel-Raheem Youssef, M.N. Abdel-Wahab, and F.A.khalifa
Suez Canal University, Egypt
4/6
56B
Mahmoud A. Sayed
29B
South Valley University, Egypt
57B
ABSTRACT
The power electronics plays an important role in the reliable operation of a
modern wind energy conversion system (WECS). This study aims at the grid
interconnection of a multi-phase permanent magnet synchronous generator
PMSG based variable speed wind turbine. The proposed system consists of two
back-to-back connected converters with a common dc-link. The generator side
converter is used to achieve maximum power point tracking (MPPT). The grid
side converter regulate dc-link voltage, its actively controlled to feed generated
power, thus enabling the grid to supply only sinusoidal current at unity power
factor (UPF). A model of directly driven five-phase PMSG- based variable speed
WECS is developed and simulated in MATLAB/SIMULINK environment. The
effectiveness of proposed control approach is validated through extensive
simulation results.
84B
| page 16
(#259) DSP-Based
Implementation of Permanent Magnet Synchronous
Motor Drives for EV/HEV Applications
5/6
Abdelsalam Ahmed1, 2, An Quntao1
1
Harbin Institute of Technology, China
2
and Sun Li1
Tanta University, Egypt
ABSTRACT
Four-quadrant operation and extending driving over the base speed of motor
drives are from the most crucial features of drivetrain of Electric and Hybrid Electric
Vehicles (EVs/HEVs) system. This paper presents an experimental implementation
of a high performance speed control strategy for a Permanent Magnet
Synchronous Machine (PMSM) for EVs/HEVs applications. The control strategy
guarantees a robust matching for the command speed within the constraints of the
drive system. The control and drive system is implemented by a TMS320F2812
Digital Signal Processor (DSP). To confirm the effectiveness of the proposed control
system, an experimental system included by PMSM, DSP control board, IPM
inverter module and interface circuits have been set up. The presented control
strategy is validated by the experimental results that depict the precisely operation
of the PMSMS in the four-quadrant circumstances and also in constant power
operation mode.
(#261) Speed
Control of High Performance IPMSM Drives Using
Feedforward Load Torque Compensator
6/6
Mohamed S. Zaky, Mahmoud A. Hassanien,
and Skokry S. Shokralla
Minoufiya University, Egypt
59B
ABSTRACT
Conventional PI controller generally gives unsatisfactory performance and it is
inherently incapable of simultaneously meeting good step reference tracking and
good load torque disturbance rejection. This paper presents a PI speed controller
with feedforward load torque compensator (FLTC) for high performance interior
permanent magnet synchronous motor (IPMSM) drives. The proposed FLTC is used
to estimate the load torque and provide a feedforward value in the speed
controller in order to decouple the load torque from the speed control. Therefore,
it can improve both the reference tracking and load torque rejection properties of
the IPMSM drive. The validity and usefulness of the proposed control scheme are
verified using simulation and experimental results. It ensures a significant dynamic
performance in comparison to the conventional PI one, particularly during load
torque disturbances and parameters variation.
86B
| page 17
12:45 pm – 14:30 pm
Basel Hall
Session PE1: Wind/Wave Energy Conversion Systems
PE1: Wind/Wave Energy Conversion Systems
2/6
1/6
Chairmen:
Prof. Dr. Hamdy S.K. El-Gohary
Prof. Dr. Hussein M.A. Mashaly
(#063) Improved
Fault Ride Through Capability for DFIG Wind
Turbines
M. M. Gamaci, T. A. Kawady, N. I. Elkalashy and Abdel-Maksoud I. Taalab
ABSTRACT
The control complexities and the unique dynamic characteristics of the doubly fed
induction generator (DFIG) raise different problems during fault conditions. Fault Ride
through (FRT) scenarios are utilized with such generators for supporting the power
systems during grid faults in order to inject reactive power into the grid for some certain
time. These times are typically adjusted according to known grid codes. This paper
explores the configuration of the FRT mechanism and improves its profile by modifying the
control of the rotor side converter (RSC) with voltage oriented vector control. Accordingly,
the reactive power can be injected with the desired amount satisfying the grid
requirements. For investigation purposes, a detailed simulation study is conducted using
Matlab/Simulink in order to corroborate the performance of the introduced methodology.
(#180) A
Speed-Sensorless Optimal Control Approach for LPMSG
Based WECS
Mostafa I. Marei, Mohamed Mokhtar, and Ahmed A. El-Sattar
Ain Shams University, Egypt
ABSTRACT
One of the attractive direct-drive Wave Energy Conversion Systems (WECS) is the
Archimedes Wave Swing (AWS) coupled to a Linear Permanent Magnet Synchronous
Generator (LPMSG). This paper presents an integrated control approach for the back-toback converter interfacing the LPMSG with the grid to extract the maximum power from
the wave. The proposed Maximum Power Point Tracking (MPPT) technique is based on
sensorless-speed control of the LPMSG to follow the wave. The Extended Kalman Filter
(EKF) is adopted to estimate the speed of the translator. The optimal speed of the LPMSG
is obtained from the instantaneous active power at the generator terminals. Numerical
simulations of the proposed WECS are conducted to show the high accuracy and fast
dynamic performance of this novel control algorithm.
| page 18
Mitigation and Maximum Power Point Tracking of
Variable-speed Grid-connected Wind Turbine
3/6
(#074) Harmonic
G. El-Saady, El-Nobi A.Ibrahim, and Mahmoud Gelany
62B
ABSTRACT
89B
This article presents a method for harmonic mitigation and maximum power point tracking
for a variable-speed grid-connected wind turbine. The wind energy conversion system
consists of a permanent magnet synchronous generator driven by variable-speed wind
turbine. The output of the permanent magnet synchronous generator is connected to a
single-switch three-phase boost rectifier to generate DC voltage, which feeds a currentcontrolled inverter to interface the system with the electric utility. The single-switch threephase boost rectifier is an active power factor correction technique to maintain the power
factor at the permanent magnet synchronous generator side to nearly unity and mitigate the
permanent magnet synchronous generator current harmonics. To mitigate inverter output
current and voltage harmonics, an LCL filter has been used. A complete analysis of the
harmonic content has been done everywhere in the system. The results show that the
proposed maximum power point tracking control strategy succeeded to track the maximum
wind power irrespective of the wind speed. This strategy in presence of an LCL filter
achieved harmonic mitigation at the permanent magnet synchronous generator and inverter
output sides.
(#222) Direct
9B
Power Control of Rotor and Grid Side Converters of
DFIGs Connected to Harmonically Distorted Grids
4/6
E. G. Shehata
Minia University, Egypt
63B
ABSTRACT
90B
This paper presents an improved direct power control (DPC) strategy of a wind turbine driven
doubly fed induction generators (DFIGs) connected to distorted grid voltage conditions. A
coordinated control strategy of the grid side converter (GSC) and rotor side converter (RSC)
of the DFIG is designed based on DPC to improve the overall scheme performance. The RSC is
controlled to eliminate the electromagnetic torque and stator reactive power oscillations,
meanwhile, the total active and reactive power oscillations are compensated by the GSC
controller to achieve constant active and reactive powers from the overall DFIG system. The
proposed control scheme removes control loops and decomposition processes of both the
rotor and GSC currents. Neither proportional-integral controller nor resonant compensator is
required for RSC or GSC control. Moreover, the proposed scheme preserves the simplicity
and fast response of the classical DPC. The feasibility of the proposed DPC scheme is
validated by simulation studies on a 1.5 MW wind power generation system under
harmonically distorted grid voltage conditions. To illustrate its effectiveness, the
performance of the proposed and conventional DPC schemes is compared under the same
operating conditions. The proposed scheme results show significant improvements in the
overall scheme performance.
| page 19
5/6
(#204) Modelling
and Analysis of Wind Turbine Based DFIG
Hamdy S. K. El-Goharey, Mostafa I. Marei and Mohamed G. S. Zaghloul
64B
ABSTRACT
This Paper develops an electromechanical dynamic model of a wind turbine based
doubly fed induction generator. Different control and protection schemes are
incorporated. This includes controller for the grid-side that is responsible for
maintaining the DC link voltage constant regardless of the power flow between the
rotor and the grid. A field orientation control with the d-axis aligned with the stator
flux is applied for the rotor side converter that is responsible to control the active
and reactive powers independently. Pitch angle controller, and protection schemes
against over current and over voltage are developed. The model is simulated using
PSCAD/EMTDC software, and simulation results are presented when the wind
turbine is subjected to different wind speeds. The results demonstrate the validity
of the developed model.
91B
(#240) Solid
State Transformer Based Wind Energy System with
Integrated Functions of Active Power Transfer, Reactive Power
Compensation, and Voltage Conversion
1B
6/6
R. G. Said, A. S. Abdel-Khalik, , and Amr El Zawawi
University of Alexandria, Egypt
M.S. Hamad
AASTMT, Alexandria, Egypt
65B
ABSTRACT
As the power of wind energy system considerably proliferates in many states
worldwide, the control of their activeand reactive power, power quality, the
efficiency improvement, and the reduction of system embodiment (volume and
weight) become increasingly more important. This paper proposes a solid state
transformer (SST) based wind energy systems with integrated functions of active
power transfer, reactive power compensation, power factor correction (PFC), and
voltage conversion, in addition to a concrete reduction in system volume and
weight. The proposed wind energy systems use three stagesSST that can
effectively suppress the voltage fluctuation caused by the transient nature of wind
energy, control active and reactive power flow, improve power quality, enhance
the overall system performance, and have the effective ability to enable the large
proliferation of wind farm (WF) into the power grid. A simulation study is
presented to show the response of the proposed system during different load
conditions. The results verify the effectiveness of the proposed system to carry out
the tasks needed to interface wind generators (WGs) to the grid, consequently,
the WG system was rendered free of power transformer and mandatory passive
and active static power compensators.
92B
| page 20
12:45 pm – 14:30 pm
Zurich_1 Hall
Session HV1: Simulation, Analysis and performance of
Insulators
Prof. Dr. Ahmed A. Hossam Eldin
Prof. Dr. Mohamed Izzularab
of Overhead Transmission Line Insulators
(porcelain and composite types) under Desert Environments
Osama E. Gouda
Adel Z. El Dein
Cairo University, Egypt
Insulators
2/6
HV1: Simulation, Analysis and Performance of Insulators
Alexandria University
Menofia University
(#001) Simulation
1/6
HV1: Simulation, Analysis and Performance of
Chairmen:
Aswan University, Egypt
ABSTRACT
This paper deals with the calculations of the electric field and the potential
distributions within and around the polluted insulators, when they are stressed by
power frequency voltage. Two types of the insulators of the OHTL are studied in this
paper; they are porcelain insulator and composite insulator. The aim of this paper is
to investigate the effect of the polluted layer thickness and conductivity on the
electric field and the potential distributions within and around the polluted insulators.
Finally, the results of the two insulator types are compared together, where the two
insulator types have the same leakage path.
(#219) Experimental
Measurements for HVDC Breakdown Voltage
in Polyvinyl Chloride Insulation Nanocomposite Materials.
O. E. Gouda
A. Thabet
ABSTRACT
Polyvinyl Chloride (PVC) with nanoparticle fillers exhibit enhanced electrical breakdown
strength and voltage endurance compared to their unfilled or micron filled
counterparts. New Polyvinyl Chloride nanocomposites have an enormously large
interfacial surface area between the inorganic particles and Polyvinyl Chloride matrix
into which they are embedded. This paper studied DC dielectric strength for quality of
power cables insulation materials, hence, experimental measurements have been
investigated for DC dielectric breakdown strength of new Polyvinyl Chloride
nanocomposite materials. It has been compared characteristics of electrical breakdown
voltage of new nanocomposites with conventional Polyvinyl Chloride industrial power
cables insulation materials. Nanostructure cost-fewer nanofillers types and their
concentrations have been specified on dielectric breakdown strength of Polyvinyl
Chloride nanocomposite systems.
| page 21
Lightning Shielding Area for Different 500 kV
HVAC Transmission Lines
Mohamed Nayel
Assiut University
ABSTRACT
The lightning shielding area of different 500 kV HVAC-TL high voltage AC
transmission lines was analyzed. The studied transmission lines were horizontal flat
single circuit and double circuit transmission lines. The lightning attractive areas
were drawn around power conductors and shielding wires. To draw the attractive
areas of the high voltage transmission lines, transmission line power conductors,
shielding wires and lightning leader were modeled. Different parameters were
considered such as lightning slope, ground slope and wind on lightning attractive
areas. From the calculated results, the power conductors voltages effects on
attractive areas around power conductors and shielding wires. For negative
lightning leader, the attractive area around the transmission line power conductor
increases around power conductors stressed by positives voltage and decreases
around power conductors stressed by negative voltage. In spite of this, the attractive
area of the transmission line shielding wire increases around the shielding wire
above the power conductor stressed by the positive voltage and decreases around
the shielding wire above the power conductor stressed by negative voltage. The
attractive areas around power conductors and shielding wires are affected by the
surrounding conditions, such as lightning leader slope, ground slope. The AC voltage
of the transmission lines make the shielding areas changing with time.
(#096) Experimental
Study on Behavior of Induction Motor
Insulation
Basem E. Elsaed, Ahmed A.Salem
Suez Canal University, Egypt
Insulators
4/6
HV1: Simulation, Analysis and Performance of
3/6
(#042) Analysis
Sobhy serry
Port said University, Egypt
ABSTRACT
This paper presents and discusses the theoretical and experimental results of the
behavior of the induction motor insulation resistance. These effects are
theoretically studied, in which a model for the induction motor insulation
resistance is developed by mathematical equations. The behavior of the induction
motor insulation is tested experimentally. Experimental results show that the
motor windings temperature increased with the increasing in the applied voltage,
further the insulation resistance increased.
| page 22
(#088) Effect
of Vulcanization Temperature on the Electrical
Characteristics of EPDM Rubber Composite Insulators
L. S. Nasrat
M. A. Mostafa E. L. Fareed
Aswan Univ., Egypt
Standards
Ain shams University, Egypt
A. I. Kandil
National Institution of
ABSTRACT
5/6
This work presents the results of a study carried out to examine the effects of room
temperature vulcanized (RTV) and high temperature vulcanized (HTV) on the electrical
characteristics of EPDM rubber composite insulators. The insulating materials studied
comprised composite disc samples of EPDM rubber and composites containing various
types of inorganic fillers, such as; Kaoline, Feldspar and Quartz powder material. The
dielectric breakdown strength (V/mil) of EPDM rubber samples have been investigated
under different polluted conditions (dry, wet and salt wet). Also, performance of EPDM
rubber and composites under Ultra Violet (UV) exposures has been studied throughout
this work.
of Contamination Constituents on Flashover
Performance of HV Outdoor Insulators in Egypt.
6/6
(#062) Influence
M.A.Abouelsaad M.A. Abouelatta
Benha University, Egypt
B.Arafa
M.E.Ibrahim
Egyptian Electricity Holding Co.
ABSTRACT
Contamination on outdoor insulators enhances the chances of flashover and can lead to
transmission line outages and reduced system reliability. In practice, various
contaminant types, usually classified as soluble and insoluble, settle on outdoor
insulators and increase the possibility of flashover. The paper presents an assessment of
the flashover performance of such insulators in Egypt; in view of the nature and
composition of contaminants accumulated on their surfaces. To quantify these
contaminants, numerous samples are gathered from different regions of the country
and subjected to a comprehensive chemical analysis at the scale analysis laboratory of
the Egyptian Electricity Transmission Company. Measurements of equivalent salt
deposition density (ESDD) surface conductivity (SC), maximum leakage current (MLC)
and flashover voltage (FOV) were conducted and correlated to the contamination
constituents. The study utilized IEC standard cap-pin suspension insulators which were
hanged in regions of different pollution levels and nature. Regression models for
predicting the flashover voltage as related to ESDD and MLC as related to surface
conductivity were developed. The models are validated through statistical analysis as
well as comparison with measured data. The results from this work are useful for
utilities to take adequate measures to improve the efficiency of their transmission
systems through scheduling of their insulator maintenance strategy and selecting the
appropriate insulator design for different system voltages and regions.
| page 23
12:45 pm – 14:30 pm
Zurich_2 Hall
Session PS1: Power System Planning
Chairmen:
Prof. Dr. Mohamed K. El-sherbiny
Prof. Dr. Hesham Temraz
(#149) Institutional
Assiut University
Capacity Building for Energy Auditors
Hafez El Salmawy, Kamelia Youssef, and Dina M. Said
PS1: Power System Planning
1/6
Egyptera, Cairo, Egypt
2/6
JCEE, Prog. Coordinator
ABSTRACT
One of Egypt ERA’s (Electrical Utility and Consumer Protection Regulatory Agency) main
activities is to develop the capacity of energy auditors and energy managers in Egypt. The
capacity building program includes training of energy managers and energy auditors,
energy audits, energy efficiency (EE), feasibility studies and energy efficiency pilot projects
for industrial and commercial buildings. Training for energy managers and energy auditors
is carried out to support EEHC (Egyptian Electrical Holding Company) and EDCs ( Electric
Distribution Companies) on energy conservation and it is designed to train about 90
participants (divided into four groups) from EEHC and EDCs which will qualify them to be
professional Energy Efficiency Consultants for their main customers. The participants will
get trained to implement technical energy audits and offer reports and solutions for
sustainable, reduced energy consumption and reduced overall CO2 emission. During the
program the trainers developed a case study in hotel building. Hotels are large consumers
of electricity and energy. The energy saving potential of hotels is significant, since a large
part of the energy consumption is due to unnecessary loss and wastage. The paper
presents this successful training program and also presents the case study in “XY” hotel
showing how the energy efficiency program affected it.
(#120) A
Andreas Zoellner
Combined Technique for Price Prediction and Critical Peak
Decision
C. N. Younan, R. A. Swief, A. Y. Abdelaziz
ABSTRACT
To implement a good Demand Response (DR) program, a critical peak pricing (CPP) plan as
an active demand response program must be performed. The economic perspective of CPP
plan is the incentive of the plan conductor, or the profit of an energy service provider (ESP).
The technical perspective is a method to maximize the incentive of CPP plan, or an ESP’s
profit. If the electricity market price can be predicted properly, generation companies and
the load service entities as main market participating entities can reduce their risks and
maximize their outcomes further. This will be realized by predicting the market prices then
with the help of the SVM we will predict the overloading conditions to make the critical
peak price decision.
| page 24
(#049) Long-term
Forecasting for Total Electricity Demand in Egypt
Using ANFIS Predictor
Mohamed A. Metwally Mohamed A. Ali, Fahmy M. Bendary
3/6
Suez Canal Authority
4/6
Atomic Energy Authority
Yassin M. Ibrahem
Former chairman of N.P.P.A.
ABSTRACT
Accurate long-term load forecasting is very important for electric utilities in planning new
plants. Also it is very significant for the routine of maintaining, scheduling annually,
electrical generation, and loads. The paper presents the design of three scenarios for
long-term forecasting electricity load till year 2025. The first scenario is for low total
demand forecasting scenario whereas, the second scenario is for medium total demand
forecasting scenario, and finally the third scenario for high total demand forecasting
scenario using Adaptive Neuro-Fuzzy Inference System (ANFIS). The paper defines the
load forecasting types and the summarizes the most important factors affecting the load
forecast in Egyptian electricity network. The research work presents the different analysis
between the three scenarios results. Results and forecasting performance obtained
reveal the effectiveness of the proposed approach and show that it is possible to build a
high accuracy scenario with less historical data using a combination of neural network
and fuzzy logic.
(#019) Digital
University of Benha, Egypt
Said A. Kutb
Redesign of a PI Controller for a Power System Based
on PIM Method
G. Shabib, A. Z. EL Dein, and G. Magdy
ABSTRACT
In this paper, a new algorithm is presented which convert the S-domain model of PI
controller to a Z-domain model to enhance the damping of a single machine power
system. The new method utilizes the Plant Input Mapping (PIM) algorithm. The proposed
method is based on a transfer function from the reference input to the plant input, which
called continuous time plant input transfer function CT-PITF. All the poles of the transfer
function that need to be controlled must appear in the CT-PITF. The results obtained from
the proposed digital PI controller match the CT-PI controller especially for longer
sampling period where Tustin's method is violated. The proposed algorithm is stable for
any sampling rate, as well as it takes the closed loop characteristic into consideration. The
computation algorithm is simple and can be implemented easily. The proposed digital PI
controller is successfully applied to the linearized model of a single machine infinite bus
system and the performance of the analog PI controller, Tustin's controller and the
proposed digital PI controller are compared and their results are presented.
| page 25
5/6
(#176) Impact
of Changing Inter-line Power Flow Controller
Parameters on the Power System
Nabil Hussein, Ayman Eisa, and Safey Shehata
Egyptian Atomic Energy Authority
Essam Eddin Rashad
ABSTRACT
Interline Power Flow Controller (IPFC) is one of the latest flexible AC transmission
systems (FACTS) devices. It is reliable with double line systems and with loads fed from
more than one source. IPFC principle of operation and its mathematical model which is
termed as power injection model (PIM) incorporated in Newton-Raphson (NR) power
flow algorithm are presented in this paper. A software program is developed using
MATLAB package in order to simulate the presented model. Simulation studies are
carried out on a standard IEEE 5-bus system. The impact of changing IPFC parameters
based on numerical results of the proposed model is then discussed.
(#234) Reliability
Improvement of Radial Distribution System with
Different Configurations of Disconnecting Switches
Ahmed R. Abul'Wafa
Ain-Shams University, Egypt
6/6
ABSTRACT
This paper describes the concept and characteristics of disconnect switches
configuration, basic difference between single switch at start of each feeder section of
distribution systems and two switches per section one at start and one at end of the
section, and effect of switch configuration on system reliability. Disconnect switches
used on the feeders are either non-automated or remote operated disconnecting
switches. In normal operation of distribution system, these act as normally closed
switches. Whereas, in faulted conditions, the computer system at the control centre will
sense the fault location through the sensors, digital controls, GIS and will turn off the
automated switches to isolate the fault section and as well as operate other protective
devices to restore the loads in the un-faulted part of the feeder in a forty seconds period
to maintain high reliability of the distribution systems. In this paper, the reliability
indices of a radial distribution system with (i) absence of switches (ii) a switch at
upstream of each feeder section and (iii) a switch at at both downstream and upstream
of each feeder section are calculated and the results are compared. Both nonautomated and automated switches are used in study cases (ii) and (iii). In the
developed generalized analytical reliability assessment procedure, a simple upstream
search algorithm is developed to replace breadth-first and depth-first search algorithms.
| page 26
15:45 pm – 17:30 pm
Bern Hall
Session M2: Induction Machines
Chairmen:
Prof. Dr. Fathy Abd-Elkader
Prof. Dr. M. Abdel Rahim Badr
(#020) Starting
Menofia University
Future University
of Loaded Induction Motors Using VariableFrequency Drives
M2: Induction Machines
1/6
O. E. M. Youssef
A. Shaltout
ABSTRACT
Most of the papers dealing with variable frequency drive (VFD) are concerned with speed
control rather than the starting period. This paper is mainly concerned with the starting
period. The paper presents a proposed control strategy for VFD to enhance the
performance of induction motors during the starting period. The main objective of the
proposed control scheme is to provide high starting torque while the starting current is
maintained within acceptable limits. This is implemented up to the rated speed. Beyond
the rated speed, the objective is to target the steady-state operating point following the
nominal torque-speed characteristic of the motor. The capabilities of the proposed
control scheme in the two regions are examined, and a good performance is confirmed.
This scheme is suitable for motors which need high starting torque and have several
starting times per day.
(#059) A
Proposed Soft Starting Technique for Three-Phase Induction
Motor Using ANN
2/6
Amir Salah, Abd el-rhman Amin
Mansoura University, Egypt
ABSTRACT
In order to mitigate the adverse effects resulting about direct-on-line starting of induction
motors which are concluded in high inrush currents, and large starting torque pulsations,
soft starters are often employed. Soft starter is an ac voltage controller in which the
voltage is adjusted through the setting of the thyristors firing angle (α). Investigation of
optimum soft-starting voltage profile to eliminate the torque pulsations, and keep the line
current constant at any preset value is through the proper choice of the firing angle of
thyristors over the starting period. So, this paper presents a novel strategy based on
Artificial Neural Network (ANN) to achieve this task. The advantages of the technique are
its simplicity and high accuracy compared to conventional mathematical calculation and
trial and error method. Simulation results of line starts and soft starts of induction motor
are implemented in a time-domain to examine the advantage soft starter use with
different loading conditions.
| page 27
(#066) Variable
Structure Control and Direct Torque Control of
Speed Sensorless for FSTPI fed Induction Motor Drives Based
SVPWM
3/6
M. K. Metwally
Menoufiya University, Egypt
ABSTRACT
This paper presents sensorless speed control of induction motor drive using four switch
three phase inverter (FSTPI), in which the principles of variable-structure control and
direct torque control (DTC) are combined to ensure high-performance operation in the
steady state and under transient conditions. The drive employs a torque ﬂux
and
controller, the “linear and variable structure control,” which realizes accurate and robust
control in a wide speed range. The control algorithm is based on using a real time
compensation with space vector modulation (SVPWM) technique when generating
switching control signal by direct calculation of switching times based on four basic space
vectors in FSTPI. To obtain accurate speed and stator resistance estimation, the slidingmode observer (SMO) has been used. The performances of the control method are tested
in Matlab/Simulink. The experimental results ensures the robustness of the used method.
(#109) Minimization
of Self Excited Induction Generator Using
Modified Particle Swarm Technique
M.I. Mosaad
4/6
Higher Technological Institute, Egypt
ABSTRACT
Induction generators are widely used in various applications since they offer distinct
advantages over conventional synchronous machines, resulting in a simplified design,
installation at lower capital cost and substantial savings in operation and maintenance
expenses. The wind turbine induction generator system is proposed to supply isolated
loads under widely varying conditions. These conditions are the wind speed and load
variations. Under these varying conditions, there will be some changes in the terminal
generated voltage. The terminal voltage can be regulated by adapting the value of
excitation capacitance required for the induction generator. This paper presents a
Constrained Particle Swarm Optimization technique for minimizing the power losses of
self excited induction generator with terminal voltage control under operating conditions
by selecting the suitable capacitance required for the generator excitation. Testing of the
proposed technique over conventional Particle Swarm Technique is performed. Results
signify the supremacy of the proposed technique over conventional particle swarm
optimization technique.
| page 28
5/6
(#135) Controller
Fathy A.Elkader
Menoufiya University
Performance of DFIG Based Wind Energy
Conversion System
Fahim .A. Khalifa, Basem E. Elsaid
Suez Canal University
Ahmed E. kalas
Port said Univ., Egypt
ABSTRACT
Due to the growing of electrical energy demand, wind energy is receiving much
interest all over the world. This paper realizes the performance analysis, modeling
and control strategy of DFIG based wind turbines. Comprehensive models of wind
speed, wind turbine, DFIG configuration are implemented in MATLAB/SIMULINK
package. Simulation results show the feasibility and robustness of the presented
control scheme for DFIG based wind turbines.
(#254) An
Improved V/F Control for High Performance Three Phase
Induction Motor Drive
6/6
G.El-Saady, El-Nobi A. Ibrahim, Mohamed Elbesealy
ABSTRACT
The constant v/f control method is one of the most common speed control
methods for Induction motors (IMs). In this paper the performance of constant
v/f control method is improved by full compensation of the stator resistance
voltage drop by the injection of low frequency boost voltage to achieve the
rated torque-speed characteristic at any speed below rated speed. Also simple
frequency compensation based on estimation of air-gap power and a linear
motor torque-speed approximation is introduced. The dynamic performance
of IM for proposed system is studied by MATLAB/SIMULINK under different
load and speed variations. Further the proposed system is compared with the
previous work. The simulation results show that the speed accuracy of the
proposed method is improved effectively, even at low speed.
| page 29
15:45 pm – 17:30 pm
Basel Hall
Session PE2: Photovoltaic Interface Systems
Chairmen:
Prof. Dr. Said Wahsh
Prof. Dr. Somayya Afifi
(#022) A
Electronics Research Institute
proposed technique for bidirectional grid connected PV
system
G.El-Saady, El-Nobi A.Ibrahim, Mohamed EL-Hendawi
PE2: Photovoltaic Interface Sys
2/7
PE2: Photovoltaic Interface Systems
1/7
ABSTRACT
The present paper proposes a novel technique for bidirectional grid connected
PV system. The analysis and implementation of a series connected PV system for
grid-connection are developed. The objective of the gateway DC-AC conversion
system is to develop a low-cost conversion system for clean residential
electricity. The proposed grid connected PV system prototype has a combination
of DC-DC, DC-AC and/or AC-DC converters for the flexible and uninterruptible
energy utilization. A buck converter is used for the maximum power point
tracking (MPPT) implementation and also it presents the functions of battery
charger and step-down converter. Further the DC-DC converter realizes phase
shifting to control power flow through a transformer with a MOSFET full bridge
on the low voltage side (LVS). In addition, a voltage doubler on the high voltage
side (HVS) is installed to achieve enough high voltage to run the inverter. The
inverter is connected to the utility grid through the LC filter. The inverter
operates as a current-controlled source to generate an output current based on
a reference current signal. The operation principle, theoretical analysis and
simulation results are presented .The digital simulation results prove the
effectiveness of the proposed PV system in terms of fast response ,high
efficiency and best waveforms of output voltage and current.
(#067) Analysis
and Control of Standalone PV/Battery Generation
System
Gaber El Saady ,El Noby Ahmed and Samy Faddel
ABSTRACT
This paper presents modeling of standalone PV/Battery hybrid generation
system in MATLAB/Simulink software. Maximum power point tracking technique
were applied to extract the maximum power and a battery energy storage can
be charged and discharged to balance the power flow between the PV
generation and the load. Two control methods for the control of the load
voltage are compared. Simulation results presented here validate the
component models and the chosen control schemes.
| page 30
3/7
(#048) Modeling
and Maximum Power Point Tracking with Ripple
Control of Photovoltaic System
G.El-Saady, El-Nobi A.Ibrahim
and
Mostafa Ahmed
ABSTRACT
This paper presents parameters determination of photovoltaic (PV) module
based on data-sheet parameters using Newton-Raphson iterative method. The
characteristic of photovoltaic module are drawn based on the extracted
parameters. Simulation and maximum power point tracking (MPPT) are
developed using Matlab/Simulink. Incremental conductance (INC) method for
MPPT is used to control a dc-dc boost converter with resistive load. Parameters
of boost converter are designed to operate in continuous conduction mode
.State- space averaging technique is used to control stand-alone PV module and
obtain inductance value for certain amount of ripple in boost inductor current at
different temperature and irradiance conditions.
(#064) A
Practical and Low Cost Experimental Implementation of
Photovoltaic Array Emulator
M. S. Abbas, N. I. Elkalashy, H. Z. Azazi, T. A. Kawady, A. I. Taalab
4/7
ABSTRACT
In this paper, an experimental emulator is proposed and constructed for the
photovoltaic (PV) array. The proposed model is derived from the basic
equivalent circuit of a photovoltaic cell, which is basically represented as a
current source in parallel with a series array of diodes. The series array of diodes
is implemented by a diode and zener diode connected in the reverse direction
for providing the module voltage. The series and parallel resistances are
considered to finally attain the practical nonlinear I-V characteristic. The model
parameters are estimated from the manufacture data of a photovoltaic module
and also from a real photovoltaic panel of 20W. Comparing the characteristics of
the constructed emulator with the ones of field measurements and the
corresponding manufacture data validates the successful profiling of the
photovoltaic module. This model reduces the size and cost of the photovoltaic
laboratory prototype and consequently facilitates conducting advanced research
efforts for solar energy system ap-plications without reliance on a real
photovoltaic system.
| page 31
5/7
(#155) A
Case Study of a Desalination Plant in Sinai Desert Using
Stand-alone PV System.
Khaled Abo Sair
Company for Water
6/7
Ahmd Kalas, Medhat Elfar
Port Said University
Soliman Sharaf
Helwan University
ABSTRACT
The application of photovoltaic system with reverse osmosis (RO) desalination
plant is considered to be one of the most promising solutions, especially, in
remote regions to have pure water. This paper focuses on the estimation of
energy and water production from stand-alone PV system driven reverse
osmosis desalination unit in Sinai desert, Egypt. This generated energy and water
production for each month of the stand-alone PV system is presented, changes
energy. According to climate conditions in Nikhil region in Egypt, it was selected
as brackish feed water. Also, Sizing the components of PV Generator, the battery
and system configuration for RO desalination unit used in this plant, which using
membrane techniques, are based on the RO unit spiral modules with
desalination plant connected PV system.
(#169) Numerical
Modeling and Integration of a PV System Using
Finite Element Method
I.M. Mahmoud, S. O.Abdellatif, T. S.Abdelsalam
The British University, Egypt
O. E. Abdellatif
Banha Univ., Egypt
ABSTRACT
This paper presents a new approach in modeling the photovoltaicbehaviour
numerically using both ComsolMultiphysics and MATLAB simulation tools. The IV/P-V characteristic curves are simulated and the device electrical parameters
(open circuit voltage, short circuit current, fill factor and conversion efficiency)
are calculated. In addition to that, PV system integration takes place in this work
through modeling a DC/DC buck converter, lead acid battery and DC/AC inverter.
The DC/DC buck converter is converting the output PV panel voltage to a fixed dc
voltage (12V) to charge the lead acid battery. In stand- alone system the inverter
should be small, reliable and inexpensive so using the buck boost inverter is
chosen. The DC/DC converter, battery and inverter are simulated using
MATLAB/SIMULINK.
| page 32
(#056) Module
Integrated Converter for Photovoltaic Applications
With Different Control Strategies
M.A.Bakkar
7/7
Alexandria University, Egypt
M.A.El-Geliel
AASTMT, Alex
ABSTRACT
This paper presents the analysis of a multifunctional single phase multi stage
grid connected photovoltaic system. Concentrates on the topology study of the
photovoltaic (PV) Module integrated converter (MIC) in the power range below
500 W. MIC technology has become a global trend in grid interactive PV
applications and may assist in driving down the balance of system costs to
secure an improved total system cost.
In this paper, a simple control method for two-stage utility grid-connected
photovoltaic power conditioning systems (PCS) is proposed. This approach
enables maximum power point tracking (MPPT) control with post-stage inverter
current information instead of calculating solar array power although no
information is needed on PV array, which significantly simplifies the controller
and the sensing part.
In addition fuzzy logic control (FLC) method is presented and show difference
between this method and other methods to control the PV power. MPPT using
FLC has advantages of better performance, robust and simple design. In
addition, this technique does not require the knowledge of the exact model of
system and it can handle the nonlinearity. Modelling, controller design,
simulation study of a grid connected PV system, and the overall configuration of
the grid connected PV system is present.
| page 33
15:45 pm – 17:30 pm
Zurich_1 Hall
Session HV2: Corona & Partial Discharge
Chairmen:
Prof. Dr. Roshdy M. Radwan
Prof. Dr. Mazen M. Abdel-Salam
Cairo University
Assiut Shams University
current-voltage characteristics of wire-duct
precipitators with grading of wire-to-wire spacing and wire radius
HV2: Corona & Partial Discharge
1/6
(#168) Corona
Abou Hashema M. El-Sayed
2/6
ABSTRACT
This paper aims to investigate experimentally how the characteristics of the corona currentvoltage in wire-duct electrostatic precipitators (ESP) are influenced by grading of wire-to-wire
spacing only and with grading of wire radius. The grading is made to counterbalance the
shielding effect of outer wires on the central ones. The measurements have been made using a
laboratory model of precipitators with and without grading of wire radius. The effect of
grading of wire-to-wire spacing only has been studied. Also the effect of grading of both wireto-wire spacing and wire radius on current-voltage characteristics of wire-duct precipitator has
been explored. A comparison is made between precipitator currents with grading against
those currents measured using constant wire-to-wire spacing and constant radius at the same
applied voltage. The grading is made to counterbalance the shielding effect of outer wires on
the central ones. This is achieved by decreasing the wire-to-wire spacing and increasing the
wire radius in the direction from the center to the ends of the precipitator. Grading of both
wire-to-wire spacing and wire radius tend to improve the collection efficiency more than the
grading of wire-to-wire spacing only or grading of wire radius only.
(#192) Onset
Hamdy Ziedan
voltage of negative corona in wire-meshed cylinder
configurations
Soliman El-Debeiky, Salem El-Khodary, May M. Ali
Mazen Abdel-Salam
Assiut Univ., Egypt
ABSTRACT
This paper is aimed at evaluating the electric field, the negative corona onset voltage and the
corona current in wire-solid cylinder and wire-meshed cylinder configurations. Charge
simulation technique is used for calculating the electric field between the wire and the outer
cylinder. The onset voltage is calculated based on the calculated field and the criterion for selfrecurring single electron-avalanches in the ionization-zone around the wire surface. The corona
current–voltage characteristics are measured for the configurations with different wire radii.
The calculated corona onset voltage values agreed reasonably with those measured
experimentally. The corona currents with wire-meshed cylinder are lower than those with a
wire-solid cylinder; even the corona onset voltage for the wire-meshed cylinder is lower than
that for wire-solid cylinder.
| page 34
Onset, Electric field and Ion Current density of a TriElectrode System for Electrostatic Separation Processes
3/6
(#224) Corona
Mohamed M. Abouelsaad, Mohamed A. Abouelatta, Abd-Elhadi R. Salama
ABSTRACT
The paper presents a detailed experimental and numerical analysis of the corona
characteristics of a proposed "Tri- electrode system"; consisting of an ionizing wire, an
adjustable auxiliary wire and a non-ionizing cylinder, for electrostatic separation
applications. The three electrodes have the same voltage and placed parallel above a
grounded plate. A computational scheme coupling the method of characteristics and the
charge simulation method is developed to solve the corona governing equations and to
compute spatial distributions of the electric field and current density of the system. An
experimental setup is constructed to model the electrodes arrangement. Dependence of
the distributions of the electric field and current density on the system's geometrical
characteristics is established and assessed both numerically and experimentally. The
configuration offers a more controlled and efficient charging process and separation when
compared to earlier separators' designs. The computed results compared favorably well
with experiments.
(#226) Addressing
Uncertainties for Accurate Determination of
Corona Power Loss of HVDC Power Lines
M.A. Abouelatta
4/6
ABSTRACT
Accurate determination of corona power loss on HVDC power lines usually represents a
difficult problem for utilities. This is due to the numerous uncertainties associated with the
corona phenomena. Such uncertainties may include line clearances values, conductor surface
coefficient and atmospheric conditions. Interval mathematics provides a tool for the practical
implementation and extension of the “Unknown but Bounded” concept. The paper presents
the application of Interval Mathematics to, rigorously, address uncertainties associated with
corona losses. While several methods exist to determine corona power loss, these methods
usually require data which may be uncertain in nature. To account for such uncertainties, the
interval mathematics is developed with the integration of input parameters’ uncertainties, in
interval format, into the governing expressions earlier by several electric utilities. The effects
of uncertain inputs within the proposed model are examined for various assumed levels of
overall uncertainties. To assess the relative contribution of each uncertain input, an interval
sensitivity analysis is carried out. Electric field upon the conductor surface, corona current and
corona power loss values are calculated using the traditional single point numbers as well as
interval numbers. The values from the two methods are compared to prove the validity of
interval analysis to, practically, model uncertainties associated with HVDC transmission lines
corona loss analysis. Successful implementation of the proposed method is described for two
geometries; monopolar and bipolar dc lines.
| page 35
(#232) Partial
Discharge Measurements with Internal Artificial
Cavities Defects for Underground Cables
5/6
Adel El-Faraskoury
Ossama Gouda
Extra High Voltage Research Center, Egypt
ABSTRACT
Power cables are of great importance in power transmission and distribution systems. Power
cable system basically consists of cables themselves and their accessories. Cable accessories
consist of joint and termination. Joint is special connection component which used to join two
cable ends together while termination is special component to provide the end of a cable.
Internal cavity frequently occurs in the form of spherical or elliptical gas-filled cavity. If the
voltage is applied to the insulation system, the electric field in the cavity will be higher than the
surrounding insulation medium due to the lower dielectric constant of the gas inside the cavity
than the dielectric constant of the insulation medium. Partial discharge (PD) occurs often
within gas filled voids in solid or impregnated insulation or from sharp protrusions which result
in a field enhancement in gaseous, liquid or solid insulation systems of high voltage
equipment. If the local field exceeds a certain limit determining the onset voltage and a
seeding electron are present, and then an electron avalanche will result. This paper is an
overview covering best practices for cable testing using different artificial cavities, and applying
predictive diagnostic programs to aging cable systems.
(#257) Detection
of Partial Discharge Locations in Power Transformer
Based on the Winding Terminals Current
6/6
Helwan University, Egypt
El-Sayed M. El-Refaie, El- Sayed H. Shehab, Mohamed K. Abd El-Rahman,
Omar A. Helaly
Techniques for locating partial discharge (PD) sources are of major importance during
manufacturing stages especially in case of innovating new transformer ratings as well as during
repairing power transformer before occurring total insulation breakdown. This paper presents
an approach to identify PD locations in the transformer windings based on the peak value of
the currents which are resulted from PD injection at different locations inside the winding of
transformers. These currents are measured at both ends of the winding. High frequency
transformer model is employed in ATP draw to investigate the response of the transformer
windings to the PD pulses. Different reduced models are studied to determine the most
reduced efficient transformer model for the purpose of locating PD sources. Pulses with
different front and tail times are injected in different locations. The first peak value of the
produced current in both sides of the windings is extracted as a characterized feature. These
features are used in the training of neural network to differentiate between PD locations. The
used neural network for training, validation and testing of different patterns is back
propagation neural network according to Levenberg Marquardt algorithm optimization. The
proposed feature precisely locates PD sources in different discs of the transformer winding.
Reduced transformer models can be used with the same accuracy.
ABSTRACT
| page 36
15:45 pm – 17:30 pm
Zurich_2 Hall
Session PS2: Power System Operation
Chairmen:
Prof. Dr. Omar Hanafy A.
Prof. Dr. Ahmed R. Abdelaziz
Helwan University
Placement of Phasor Measurement Units for Power
System Observability Using Ant Colony Optimization Algorithm
PS2: Power System Operation
1/6
(#036) Optimal
A. A. Abou El-Ela, A. M. Kinawy, M. T. Mouwafi
2/6
Kafrelsehiekh University, Egypt
ABSTRACT
This paper presents an optimal phasor measurement units (PMUs) placement (OPP) for
complete system observability with maximizing the measurement redundancy under
normal condition, as well as any single line outage or any single PMU loss conditions. The
ant colony optimization (ACO) algorithm is used to determine the minimum number of
PMUs by compromising the best of PMUs required to make the overall system complete
observability with and without considering zero injection buses (ZIBs). The ACO algorithm is
applied to the IEEE standard 14-bus, 24-bus and 30-bus. Moreover, an application of the
proposed algorithm to a real power system at the west delta network (WDN) as a part of
the Unified Egyptian Network (UEN) is introduced. The results obtained are compared with
those obtained using other techniques. Simulation results show that the proposed ACO
algorithm for the optimal locations of PMUs is more accurate and efficient, especially with
increasing the system size.
(#147) Particle
R. A. El-Sehiemy
Swarm Optimization Algorithm for Unit Commitment
Problem in Deregulated Environment
Sahar. S.Kaddah
Ragab. A. Elsehiemy, Alaa Ahmed Zaky
Kafr elshiekh University, Egypt
ABSTRACT
An important criterion in power system operation is to meet the power demand at
minimum fuel cost using an optimal mix of different power plants. Moreover, in order to
supply electric power to customers in a secured and economic manner, thermal unit
commitment is considered to be one of the best available options. The unit commitment
has been identified for this paper work. The complexity of the UC problems grows
exponentially to the number of generating units especially by applying the deregulated
rules in power system. Where in this environment the objective function is maximizing the
profit while satisfying the regular unit commitment constrains with addition of new
constrains such as bilateral and multilateral contracts. The formulation of unit
commitment in regulated and deregulated will be discussed and the solution is obtained
by an algorithm based on Particle Swarm Optimization technique the proposed algorithm
is implemented in MATLAB environment.
| page 37
(#041) Future
of Smart Grid with the Development in Nanotechnology:
An Overview
Hany A. Abdelsalam
Almoataz Y. Abdelaziz
3/6
Kafr Elsheikh University, Egypt
4/6
ABSTRACT
Smart power grid is the future transformation of the current power systems into controlled
two-way power flow networks. Smart grid allows the interactive service between customers
and grid operators and permits fully integration of distributed and renewable energy
resources into the electrical power system. The main objectives of the smart grid are to
increase the efficiency, reliability and optimal use of renewable energy. Smart grid rate of
implementation is beginning to accelerate with the rapid progress in the related
technologies. At the top of these technologies is the nanotechnology. Nanotechnology is the
science of changing and improvement of materials’ structures and characteristics in the
nano-scale (nanometer is one billionth of a meter). With this nano-scale size, materials are
expected to have unique properties. This paper presents a description for the applications
and necessity of nanotechnology in the smart power grid devices and components.
Improvements in the quality of smart power grid parts are based on its nano-structures’
modifications. This paper specifically overviews the possible applications and benefits of
nanotechnology in the photovoltaic (PV) cells, wind turbines (WT), fuel cells, storage energy
devices and smart sensors. Also the use of nanotechnology in the smart grid power
electronics, computing and communications is summarized. This overview gives a simple
frame for the future of smart grid.
(#045) Static
Security Enhancement and Loss Minimization Using A
Simulated Annealing Based Approach
S. F. Mekhamer, A. Y. Abdelaziz, M. A. L. Badr
H. M. Khattab
ENPPI -Cairo, Egypt
ABSTRACT
A developed algorithm for optimal placement and sizing of thyristor controlled series
capacitors (TCSC’s) for enhancing the static security of power system and minimizing the
overall power system loss is presented in this paper. A procedure to determine the optimal
locations and sizes of the thyristor controlled series capacitors is illustrated and presented.
The locations are determined by evaluating contingency sensitivity index (CSI) for a given
power system branch for a given number of contingencies. Optimal sizes of TCSC’s are
determined by the optimization technique of simulated annealing (SA), where TCSC’s settings
are chosen to minimize the overall power system losses. The developed methodology target is
to enhance power system static security by alleviating overloads on the power system
transmission lines and maintaining the voltages at all load buses within their specified limits.
The proposed developed algorithm is tested using different IEEE standard test systems to
show its effectiveness in enhancing the power system static security and minimizing the
system losses.
| page 38
(#084) Optimal
Economic/Emission Dispatch using λ-Based Analytical
and GA Methods
Ahmed R. Abul'Wafa , A.T.M. Taha
5/6
ABSTRACT
The economic/emission dispatch (EED) assumes a lot of significance to meet the
clean energy requirements of the society, while at the same time minimizing the
cost of generation. The search based EED approaches are computationally
inefficient particularly for problems with large number of decision variables. This
paper attempts to develop an analytical and a GA based modified approaches with
a single decision variable to solve the EED problem. The philosophy involves the
introduction of a new decision variable through a prudent mathematical
transformation of the relation between the decision variable and the optimal
generations. It thus yields a reduction in the number of problem variables and
contributes to realistically enhance the performance of the existing heuristic
strategies. The objective function is thus obtained by blending the emission cost
function with the fuel cost function through the use of a price penalty factor and
the constrained optimization problem is formulated for both approaches. The
feasibility of the proposed approaches is evaluated through a six generators system
and the results are compared with the available methods to highlight its suitability
for online applications.
Modified PMUs Placement Algorithm With Limited
Channels For Bad Data Detection Enhancement
6/6
(#100) A
Ahmed H. Kassem , Nabil H. Abassy , Emtethal N. Abdallah
ABSTRACT
Phasor measurement units have increased the ability of monitoring electrical
power systems in real time. In this paper two proposed algorithms where with
few extra measurement devices (PMUs) all critical measurements present in the
system can be converted into redundant ones. In the first placement algorithm
the number of channels in a PMU is limited i.e. A PMU placed at a certain bus can
measure some of the branch currents originating or terminating at that bus. The
second algorithm also introduces the limit of the number of channels present in a
PMU but we want to install only PMUs for the system to be completely
observable i.e. no conventional measurements will be installed in the system.
Then showing the difference between these two algorithms in the number of
used PMUs and the buses at which these PMUs will be placed. The proposed
algorithms are applied to IEEE 57 and 118 test bus systems and the results show
the effectiveness of the algorithms.
| page 39
9:00 am – 11:00 am
Bern Hall
Session M3: Special Machines
Chairmen:
Prof. Dr. Ibrahim Abdel-Moneim
Prof. Dr. Adel Y. Hannalla
Benha University
(#153) Investigation of the Transformer Magnetizing Inrush
Current with Different Calculation Approaches
M3: Special Machines (1/6)
Nadia Abd Elfattah, Ali H. Kasem Alaboudy, and Hossam E. Mostafa Attia
Faculty of Industrial Education, Suez University, Suez, Egypt
ABSTRACT
Un-controlled energization of transformers produces high inrush currents, which can
reduce the transformers’ life span due to the high mechanical stresses involved, and can
also lead to the unexpected operation of protective relays and other power-quality
issues. In this paper, four different inrush current numerical computation approaches
have been conducted. Further, a comprehensive study on the parameters affecting the
inrush current calculated with different techniques. The parameters affecting the
generation of inrush current in a transformer are number of phases, switching-on angle
α, residual flux, 𝛷r, material used for core, short circuit ratio (SCR), grid impedance X/R
ratio, and winding connection in case of three-phase transformers. Single- and threephase power transformers are considered. The numerical calculation methods are
developed in MATLAB Environment. Simulation results have demonstrated that the
connection of / draws the highest inrush current values.Therefore, this paper will
discuss the impact of different parameters on this transformer winding connection.
(#164) Horizontal Axis Wind Turbines Modeling
Adel El Shahat
Suez University, Egypt
ABSTRACT
It is necessary to design, simulate and test the renewable energy systems. The
Horizontal Axis Wind Turbine (HWT) is an affirmative part of renewable energy and
smart grid systems. The HWT is modeled by the use of actual data. Artificial Neural
Network (ANN) numerical technique is used to simulate and evaluate the designed
proposed work. The implemented work may help the designer and/or investor in order
to elect a specified HWT according to the demanded power load. The results show a
very good matching with the actual commercial data points of the HWT systems. ANN
models are created with suitable numbers of layers and neurons, with their GUI which
trained, simulated, checked and their algebraic equations are concluded accurately with
excellent regression constant.
| page 40
(#244) Comparative Study of Five-Phase Permanent Magnet Vernier
Machines with Different Rotor Poles
Maie Wefky, A. S. Abdel Khalik, and I. F. El Arabawy
ABSTRACT
Recently, electric vehicles (EVs) have met a great interest as environmental friendly
technology instead of conventional vehicles with internal combustion engines (ICEs).
Among different machine types, permanent magnet (PM) brushless motor is the most
commonly employed motor type for this technology. High power density, high efficiency,
and higher fault tolerant capability at low speed can be achieved by emerging a coaxial
magnetic gear (MG) into a PM brushless machine resulting in a Permanent magnet
vernier (PMV) machine. The performance of a fault-tolerant PMV machine depends on
the proper selection of slots/poles combination which offer low speed/high torque
operation and eliminate the effect of low order harmonics in the stator magneto motive
force and hence reduces the vibration and stray loss. In this paper, three external rotor
five-phase machines with the same dimensions and different slots/poles combinations
are designed. A simulation study is carried out using Finite element method (FEM) to
compare the performance of the three machines at rated condition.
(#154) Mathematical Analysis of the Turbine Coefficient of
Performance for Tidal Stream Turbines
Shady H. E. Abdel Aleem
Ahmed F. Zobaa
15th May Higher Institute of Eng., Egypt
Brunel Univ., Uxbridge
Ahmed M. Ibrahim
Cairo Univ., Egypt
ABSTRACT
Unregulated water currents such as tides and ocean currents include energy that could be
utilized for electricity production. These currents can be seen as dead bodies of water
with potential energy, driven by gravity or alive moving with a kinetic energy (KE). Tidal
stream turbines are a relatively new technology for extracting KE from tidal currents,
which is currently in progress from development stage to industrial execution. One of the
most important factors in tidal power analysis is the rotor efficiency coefficient or turbine
coefficient of performance (λ). It depends on the rotor blade geometry and water
velocity. This article presents a mathematical description of good interpolating functions
which describe this coefficient analytically, for tidal stream turbines. Nonlinear curvefitting solver in least-squares sense has been used in this study. Various interpolation
functions have been proposed. The proposed mathematical descriptions can be very
helpful for tidal power analysis and output power estimation.
| page 41
(#231) Design and Dynamic Analysis of an Axially-Laminated Self-
Starting Synchronous Reluctance Motor
Said M. Allam
ABSTRACT
This paper presents a proposed design of an axially-laminated self-starting synchronous
reluctance motor. The proposed synchronous reluctance motor has a stator of originally
three-phase squirrel-cage induction motor. The experimental axially-laminated rotor is
made of solid-steel laminations and built with dimensions to fit into a standard stator
frame. The proposed rotor is equipped with a cage winding in order to provide a starting
torque. An accurate analysis with which the dynamic behaviour of the proposed
synchronous reluctance motor can be successfully predicted under different operating
conditions is also presented. The proposed analysis is based on the dynamic qd-axis
model. The qd-axes are attached to rotor and hence, they rotate at the rotor speed, ɷr.
Some comparisons between the simulation and experimental results are illustrated to
demonstrate the accuracy of the proposed design and the developed dynamic model.
High agreement between experimental and simulated results has been observed, which
supports the validity of the proposed design and analysis.
(#252) Cogging Torque Reduction of Axial Magnetic Gearbox Using
Step Skewing Technique
H. Zaytoon, A. S. Abdel-Khalik, and I. El-Arabawy
A. M. Massoud
S. Ahmed
Qatar University,Qatar
Texas A&M University,Qatar
ABSTRACT
Magnetic gearbox (MGB) is one of the promising research topics in mechanical
transmission as it offers significant advantages over its mechanical counterparts such as
contactless power transfer, high gear ratios, inherent overload protection, high torque
density, and maintenance free. However, the main operational problem of any magnetic
system is the cogging torque originated from the interaction with the high strength
permanent magnets (PM). This parasitic phenomenon causes additional vibrations and
acoustic noise. This paper introduces a technique for torque ripple reduction in MGBs
using the step skewing technique, which is one of the torque ripple mitigation techniques
in conventional PM machines in several applications. This technique is applied to a
conventional 16/4 axial MGB, which normally results in a significant cogging torque
magnitude. The 3D finite-element analysis (FEA) confirms the effectiveness of this method
and the optimum skewing angles that optimize the torque profiles for both high and low
speed rotors are determined.
| page 42
9:00 am – 11:00 am
Basel Hall
Session PE3: DC/AC & DC/DC Converters
PE3: DC/AC& DC/DC Converters (1/6)
Chairmen:
Prof. Dr. Sabry Abdel-Latif
Prof. Dr. Ahmed Abdel-Sattar
Menofia University
(#095) Performance Analysis of Z-Source Inverter Considering
Components Non-Idealities
Fatma A. Khera, and Essam Eddin M. Rashad
ABSTRACT
This paper presents mathematical and experimental analysis of Z-source inverters (ZSI)
when feeding inductive loads. A focus has been given to the effect of components nonidealities i.e. inductor resistances, electronic switches internal resistance and diode
forward voltage. A simple mathematical form has been derived to obtain the voltage
transfer ratio (VTR) in terms of inverter and load parameters for different control
techniques. The analysis has been checked experimentally for two control techniques.
The results showed acceptable validity of the theoretical analysis. The obtained analysis
and relations are useful in designing and operating Z-source inverters.
(#143) EMTP theory based modeling of DC-DC boost converter for
Photovoltaic applications
M. S. Rady1, M. Ezzat1, and M. Abdelrahman1
Anis Ammous2
1
2
National School of Eng. of Sfax, Tunesia
ABSTRACT
An important application of a DC-DC boost converter is to maitian the output voltage
constant for grid connected photovoltaic application systems. The boost converter is
designed to step up a fluctuating solar panel voltage to a higher constant DC voltage.
Also, it is able to direct couple with grid-tied inverter for grid connected photovoltaic
system. The real-time simulation of boost converter circuit is challenging for several
reasons. A PC-based simulation can hardly achieve time-steps below 5-10 μs: this yields
a limit on the maximal power electronic switching frequencies that can be accurately
simulated using standard methods. This paper presents simulation methodology based
on EMTP theory that can be used for the hardware implementation of high-performance
FPGA-based aimed for the real-time simulation of power electronic systems. The power
electronic circuits are modeled using the associated discrete circuit technique.
| page 43
(#235) A New Voltage Balancing Technique for Modular
Multilevel Converters with Reduced Number of Sensors: Arm
Voltage Control
Ah. Samir, Ah. Elserougi, Ay. S. Abdel-Khalik, and Ib. El Arabawy
ABSTRACT
Modular multi-level converter (MMC) is one of the possible voltage source converter
(VSC) topologies that offer outstanding merits such as modularity and scalability.
Generally, the main technical challenge of different VSC topologies is the voltage
balancing of the DC-capacitors. Commonly, conventional sensor-based balancing
techniques require a significant number of voltage measurements, 2k (N-1) voltage
sensors, for an N-level and k-phase converter, which increases system complexity. In
this paper, a new balancing technique with a reduced number of voltage sensors is
proposed. In the proposed technique, only one sensor per arm is needed, i.e. 2k
voltage sensors will be needed instead of 2k(N-1). The basic role of the proposed
balancing technique is to control each arm voltage to track its desired instantaneous
voltage level by continuously searching for the appropriate combination from the
available states of different arm sub-modules. A simulation model has been built to
validate the proposed balancing technique.
(#276) Design and Implement of DC/DC Converters for
Photovoltaic Systems
Adel A. Elbaset
Ahmed E.Hussein, and Ramadan M. Mostafa
Beni-Suef University, Egypt
ABSTRACT
The main purpose of this paper is to introduce an approach to design and implement a
DC/DC boost converter to achieve maximum permissible power obtained from PV
system. The boost converter is designed to step up a fluctuating solar panel voltage to
a higher constant DC voltage. Moreover, it is exposed to significant variations which
may take system away from nominal conditions due to changes on the load or on the
line voltage at the input. Design components and experimental work of DC/DC boost
converter were performed to cover the whole range of radiations and temperature.
Experimental works were carried out with the designed boost converter which has a
power rating of 30 W and 24V output voltage operated in continuous conduction
mode at 50 kHz switching frequency. The test results show that the proposed design
exhibits a good performance.
| page 44
(#242) A Fault Ride-Through Implementation Using Dynamic
Voltage Restorers under Different Operating Conditions
H.M. Mahmoud, R.A. Swief, A. Attallah, M.A. Mostafa, and M.A. Badr
ABSTRACT
Renewable energy sources are presented to maintain the power generation and
consumption balance which is necessary to stabilize the functioning of the power
system. Wind turbine based on doubly fed induction generator, variable speed wind
turbine, is the most popular renewable source implemented. Some faults may occur in
the system for short time. According to standards wind turbine must be switched off
during fault. So, it is very important to analyze the power system with respect to faults
and abnormal operation to prevent turbine disconnection. The power converter, which
is the only need to be rated to handle the rotor power, presents a method for
compensating fault ride-through of a wind turbine based on doubly-fed induction
generator by using a dynamic voltage restorer .
(#262) Performance Characteristics and Modelling of Solar
Photovoltaic Energy Conversion System
Mohamed S. Zaky
ABSTRACT
Solar energy becomes a promising alternative energy resource to overcome the
problems of conventional energy resources. It becomes imperative for Egypt to exploit
this important energy resource. However, the performance of a solar photovoltaic (SPV)
energy conversion system is mostly affected by solar irradiance and cell temperature. It
is important to understand the relationship between these effects and the output power
of the SPV array. This paper presents modeling and simulation of SPV module taking in
to account the cell temperature and sun's irradiance. Simulation model of SPV module
with DC/DC converter is built using Matlab/Simulink environment. The SPV module is
modeled and its current-voltage and power-voltage characteristics are simulated. The
effect of temperature and irradiance on the performance characteristics of the SPV
module and its extracted maximum ouput power is investigated. The simuation results
under different operating conditions demonstrate the high nonlinearity of the SPV
characteristics and their dependency on irradiance level as well as the cell temperature.
| page 45
9:00 am –11:00 am
Zurich_1Hall
Session HV3: Electro-Magnetic Fields& Environment
Chairmen:
Prof. Dr. Husssein I. Anis
Prof. Dr. Salem El-Khodary
Cairo University
HV3: EM Fields & Environment (1/6)
(#161) Grounding Pit Design Using Finite Element Method
Nehmdoh A. Sabiha, Mohamed A. Izzularab, and Fathi Abdel-Kader
ABSTRACT
In this paper, a comprehensive approach of grounding pit design is studied considering its
transient performance as well as the DC behavior. This study is carried out using Finite
Element Method (FEM). The voltage-current (V-I) characteristics and frequency response
of transient impedance are investigated under first and subsequent lightning strokes.
These characteristics are evaluated at different soil permittivity for high resistivity
uniform soil with taking the soil nonlinearity and ionizations into account. The behaviors
are investigated for two-layer soil. The effective depth of the electrode for two-layer soil
is estimated using impulse impedance-depth curve. A backfill soil such as bentonite is
used for more reduction of grounding resistance. The bentonite size effect on the
grounding pit resistance is investigated for saving the backfill volume and consequently
reducing the pit cost. Finally, the performance of the grounding pit is evaluated. The
simulated procedure provides facilities for designing grounding electrode with
complicated structure of the soil.
(#175) Assessment of Human Exposure to Electric Fields inside High
HV3: EM Fields& Environment (2/6)
Voltage Substations During Working Conditions
Sayed A. Ward, and Essam M. Shaalan
Shaher. A. Mahmoud
Egyptian Electricity Holding Company, Egypt
ABSTRACT
The minimum health and safety requirements regarding the exposure of workers to the
risk arising from electric fields produced inside high voltage (HV) substations is still
considered as a competitive topic for utility designers, world health organization (WHO)
and biomedical field researchers. Hence, the electric fields levels inside HV substations
and their induced current inside human body should be pre-evaluated as early stage in
the process of substation design. The object of this paper is to present a method for
assessment not only the distribution of power-frequency electric field inside HV
substations and the charge at the surface of a human body underneath high voltage
equipments inside HV substations, but also the induced currents and current densities
along the surface of this body. This method of analysis is based on the charge simulation
technique (CSM). This study will serve to explain the biological studies of possible longterm exposure effects to electric fields.
| page 46
(#007) New Electromagnetic Field Expressions due to Inclined
Lightning Channel
Adel Z. El Dein, G. Shabib, and Said I. Abouzeid
ABSTRACT
Evaluation of electromagnetic fields, which caused by the lightning channel, is an appealing topic
in order to consider the indirect effects of lightning on the power lines. In most computations of
lightning electromagnetic, the return stroke channel is assumed to be straight and vertical.
However, in reality, the lightning channel is most often inclined and has some tortuosity on
scales. This paper provides general expressions for the electric filed and the magnetic flux
density, at any point, that radiated from an inclined lightening channel. These general
expressions are based on the Maxwell's equations. The proposed equations can estimate the
components of the electric filed and the magnetic flux density directly without using any other
method such as finite element method or finite difference time domain method, which consume
time. Also, by using the suggested general expressions, the electromagnetic fields can be
computed in close, medium and far ranges. The proposed expressions support the notion of
vertical lightning channel by assuming the channel angle with respect to Z-axis equals zero. In
this paper, the analysis of the suggested expressions for the electric filed and the magnetic flux
density, at any point, that radiated from an inclined lightening channel, as well as their
verifications, by comparing their results by the results of the others, are achieved. Also, these
suggested expressions are applied to investigate the effect of channel geometry, position of the
observation point with respect to the channel, channel orientations (defined with the azimuth
angle ϕ) and inclination angle θ of the channel on the electromagnetic field distributions.
(#040) Comparative study of the effect of HVTL Electrostatic fields
on gas pipelines using the ATP-LCC& CSM methods
H.M. Ismail, and Salem Alkhoudary
Ahmed M. Amin
EPS Company
ABSTRACT
Overhead transmission lines require strips of land to be designed as right-of way (R.O.W). This
R.O.W can also support other users besides the transmission lines such as pipelines, railways, etc.
Increasing the amount of power transmitted requires higher voltages and currents, and therefore
the transmission corridors are increased and in turn the competition for land and R.O.W
increases. Therefore, analysis of electrical and magnetic interference effects of transmission lines
upon nearby pipelines is very important due to the possible hazards resulting from the influence
of electrical systems on pipelines such as safety of people making contact with the pipeline,
damage to the pipeline and to the cathodic protection equipment. In this paper, induced voltages
on aboveground pipelines sharing the same right-of way (R.O.W) with high voltage transmission
lines due to capacitive coupling were calculated. Two methods for calculations were used; the
first is the ATP-LCC software which considers the sag of the transmission line in calculation, while
the second is the charge simulation method, in which the transmission lines conductors are
represented by infinite line charges. The two methods are applied to different realistic
configurations of HVTL of different voltage levels including pipelines in their R.O.Ws. The effect of
different pipeline design parameters such as pipeline diameter and its height above ground on
the induced voltage is studied. A comparison between the two methods was carried out and the
reason of the difference between the results was clarified. Charging currents per unit length of
the pipeline were calculated using ATP-LCC.
| page 47
(#138) Effect of Nanofiller Type on Breakdown Phenomena in
Transformer Oil
Diaa-Eldin A. Mansour
Ahmed M. Elsaeed
Izzularab
Banha Power Plant, Egypt
Egypt
Mohamed A.
Minoufiya University,
ABSTRACT
Several studies have investigated dielectric properties of transformer oil-based nanofluids.
However, there is a lack in studies describing the nature of breakdown mechanism into
transformer oil-based nanofluids. Accordingly, this paper aims to clarify breakdown mechanisms
in transformer oil based-nanofluids and their dependence on the type of nanoparticles. Three
groups of oil-based nanofluids were prepared with different types of nanoparticles having
different band gaps. These types of nanoparticles are Al2O3, TiO2 and Fe2O3. Transformer oilbased nanofluids were prepared by direct mixing of nanoparticles with the base oil, and then, by
dispersing using magnetic stirrer and ultrasonic homogenizer. For each type of nanoparticles,
the surface was modified using the suitable type of dispersant. Within each group, the weight
percent of nanoparticles was changed and the breakdown strength was measured. Weibull
distribution was used to calculate breakdown probability for all oil samples. Ten breakdowns
were performed for each oil sample and 50% breakdown probability was selected to compare
the results. It is found that Fe3O4 nanoparticles yield the highest enhancement in the
breakdown strength, followed by TiO2 nanoparticles, while Al2O3 nanoparticles give the lowest
enhancement. Based on these results, physical mechanisms were proposed to describe the
breakdown phenomena in nanofluids considering the band gap and electronegativity of
nanoparticles.
(#190) Enhanced Dielectric Strength of Transformer Oil Using
TiO2 Nanoparticles with Surfactant
Eman Atiya1 Diaa-Eldin Mansour1 Ahmed Azmy1 Reham Khattab2
1
2
National Research Centre, Egypt
ABSTRACT
Stable suspension of nanoparticles in transformer oil, which is known as nanofluids, earned a
great interest due to their promising thermal and dielectric properties. However, agglomeration
of nanoparticles limits the beneficial effects that come with nanosize scale. Accordingly, this
study proposes a new type of transformer oil-based nanofluids using TiO2 nanoparticles with
surfactants. The role of surfactants is to hinder the formation of agglomerates, and hence,
enhance the dielectric properties of the resulting nanofluid. Two sets of nanofluid samples were
prepared. In the first set, different amounts of surfactant were used in order to assess their
effect on the dispersion of nanoparticles. The dispersion of nanoparticles was evaluated by
recognizing the particle size using Transmission Electron Microscope (TEM). In addition, zeta
potential measurements were carried out as an indication to the surface charge and the
corresponding repulsion force between nanoparticles. Based on TEM results and zeta potential
measurements, the best amount of surfactant was identified. The second set of nanofluid
samples was prepared with different percentage weights of nanoparticles for the purpose of
breakdown tests. The results showed an increase in the percentage enhancement of breakdown
strength compared to the previous studies. Finally, the physical mechanisms behind the
dispersion behavior and dielectric properties were discussed.
| page 48
9:00 am – 11:00 am
Zurich_2 Hall
Session PS3: Load Frequency Control
Chairmen:
Prof. Dr. Hassen T. Dorrah
Prof. Dr. Hossam Eldin A. Talaat
Cairo University
(#039) Two-Area Load Frequency Controller Based on Fuzzy
PS3: Load Frequency Control (1/7)
18B
Approach with the Effect of Governor Deadzone and GRC NonLinearity
Ali M. Yousef
Ahmed M. Kassem
4B
Bini-Swief University, Egypt
71B
ABSTRACT
97B
The present work investigated the load-frequency control ( LFC) for improving power
system dynamic performance over a wide range of operating conditions. This work
proposed design and application of the fuzzy logic controller on two area load frequency
with the effect of the governor deadzone and generation rate constraint (GRC) nonlinearity. The two area power system used in this study was thermal turbine. To validate
the effectiveness of the proposed controller, a two-area power system was simulated over
a wide range of operating conditions and system parameters change. Further, comparative
studies between the conventional Integral , PID controller and proposed fuzzy logic load
frequency control were evaluated on the simulation results. The proposed fuzzy logic
controller is the best that the conventional integral and PID controller in terms of fast
response and small settling time.
(#225) Artificial Bee Colony Optimization of AGC in a Two-area
19B
Interconnected Power System
M. Elsisi, M. Soliman, and W. Mansour
45B
72B
ABSTRACT
98B
Artificial Bee Colony (ABC) has recently been explored to develop a novel algorithm for
distributed optimization and control. This paper proposes an ABC-based Load Frequency
Control (LFC) design to enhance the damping of oscillations in a two-area power system. A
two-area non-reheat thermal system is considered to be equipped with proportional plus
integral (PI) controllers. The proposed design problem is formulated as an optimization
problem. ABC is utilized to search for optimal controller parameters by minimizing a timedomain based objective function. The performance of the proposed controller has been
evaluated with the performance of the conventional PI controller, and PI controller tuned
by genetic algorithm (GA) in order to demonstrate the superior efficiency of the
proposed ABC in tuning PI controller. Simulation results emphasis on the better
performance of the optimized PI controller based on ABC in compare to optimized PI
controller based on GA and conventional one over wide range of operating conditions, and
system parameters variations.
| page 49
(#050) A new load frequency control approach utlizing electric
vechicles and heat pump water heaters in smart power systems using
coefficient diagram method
Raheel Ali1, Michael Bernad1, Yaser Qudaih1, Yasunori Mitani1 and T. H.
Mohamed2
1
Kyushu Institute of Technology, Japan 2Aswan University, Egypt
ABSTRACT
In recent years, photovoltaic has generation become the most popular renewable energy
based generations. However, this power generation cannot supply constant electric power
output and sometimes cause the imbalance between supply and demand. To alleviate the
mentioned problem, a number of Heat Pump Water Heaters (HPWH) and Electric Vehicles
(EV) are used as new control equipment for Load Frequency Control (LFC) in order to
suppress the frequency fluctuation caused by such a large amount of renewable energy
sources. However, Due to the system uncertainties such as system parameters variation,
the conventional controllers which are designed without taking system uncertainties into
account in the controller design may lose the control effect and fail to damp the frequency
deviation. This will affect the quality of supply and may deteriorate the system stability.
This paper proposes, A New load frequency control (LFC) using the coefficient diagram
method (CDM) technique in the presence of variable solar power & thermal power have
been presented. The CDM technique has been designed such that the effect of the
uncertainty due to governor and turbine parameters variation and variable solar power &
load disturbance is reduced. Digital simulations for a power system are provided to
validate the effectiveness of the proposed scheme. A performance comparison between
the proposed and a conventional integral control scheme is carried out confirming the
superiority of the proposed CDM technique in smart power system.
(#258) Load Frequency Control of a Hybrid Power System Using
21B
Fractional Order PIλDμ Controller
Hady H. Fayek
Helmy. M. El-Zoghby, and A.M. Abdel
Ghany
Heliopolis university, Egypt
74B
ABSTRACT
10B
The objective of this work is to compare between fractional order PIλDμ (FOPID) controller
and conventional controller (PID) in controlling the frequency of a hybrid power system.
The hybrid power system composed of wind turbine unit, hydro unit and diesel unit. The
modern power systems with industrial and commercial loads need to operate at constant
frequency with reliable power. This paper describes the modeling of Load Frequency
Control (LFC) of an isolated wind-diesel and hydro hybrid power system using both FOPID
and PID with different load disturbances. In order to let the simulation of this compensated
system more realistic the influence of the system nonlinearity was taken into account. Also
to increase the validity of this compensated system simulation by using wide range of
parameters. To tune the controller genetic algorithm has been used for both FOPID and
PID controllers. The simulation results show the effectiveness of each controller in the
system response.
| page 50
(#146) Harmonization of Under Frequency Load Shedding Plans in
Oman-UAE Interconnected Power System
O. H. Abdalla
H. Al-Riyami, A. Al-Busaidi, and A. Al-Nadabi
University of Helwan, Egypt
Oman Electricity Transmission Company, Oman
K. Karoui, and S. Wagemans
Tractebel Engineering, Belgium
ABSTRACT
The paper assesses the need to harmonize the Under Frequency Load Shedding (UFLS)
plans of the Oman and United Arab Emirates (UAE) interconnected system. The main
objectives are to fairly share the contribution of each country in UFLS and to improve
frequency stability. A dynamic model of the interconnected system is developed for
simulating system behavior. Simulation results are presented to show comparison of
system performance with the following three UFLS plans: (i) no harmonization, i.e. each
subsystem has its own UFLS plan, (ii) harmonization of Oman and UAE UFLS using the UAE
UFLS plan, and (iii) harmonization of the two systems using the Gulf Cooperation Council
Interconnection Authority (GCCIA) UFLS recommended plan. The results show the
advantages of harmonizing the UFLS plan in both countries.
(#248) A Real Time Simulation Based New Robust Load Frequency
23B
Control System
G. Shabib, Tarek H. Mohamed, and Hossam Ali
Faculty of Energy Engineering Aswan university, , Egypt
7B
ABSTRACT
102B
This paper presents real time simulation to analyze the behavior of discrete controller for
a single area power system. A new load frequency control (LFC) design using the
coefficient diagram method (CDM). The CDM technique has been designed such that the
effect of the uncertainty due to governor and turbine parameters variation and load
disturbance is reduced. A frequency response dynamic model of a single-area power
system is introduced, and physical constraints of the governors and turbines are
considered. The real time simulation provides a quick solution for prototyping new
functions in different types of industrial processes and devices controlled with a complex
distributed control system. Real time simulations for a single area power system are
provided to validate the effectiveness of the proposed scheme. The results show that,
with the proposed CDM technique, the overall closed loop system performance
demonstrated robustness in the face of uncertainties due to governors and turbines
parameters variation and loads disturbances. A performance comparison between the
proposed controller and a classical integral control scheme is carried out confirming the
superiority of the proposed CDM technique.
| page 51
(#118) Ant Colony Optimum Tuning of PID Load Frequency
Controller for the Egyptian Power System
M. A. Abdel Ghany, M. E. Bahgat, W. M. Refaey, and F. N. Hassan
University of Helwan, Egypt
ABSTRACT
The proportional-integral-derivative (PID) controllers are the most popular controllers of
this century because of their remarkable effectiveness, simplicity of implementation and
broad applicability. However, PID controllers are poorly tuned in practice which is mostly
done manually with difficulty and time consuming. This paper presents a novel intelligent
design method for PID controller with optimal tuned parameters based on the Ant Colony
System (ACS) algorithm. A comparative study is presented using three cost functions for
the tuning of ACS-PID controllers for the Egyptian Power System (EPS) load frequency
control as a single area with multi unit power system. The studied power system comprises
three power plants, i.e., non-reheat, reheat, and hydro generation plants. The proposed
ACS-PID controller is designed based on an average point of four loading conditions of the
EPS during summer and winter of 2008. Simulation results using MATLAB/Simulink Toolbox
are carried out with the power system subjected to disturbances variation and parameters
change in the presence of the system inherent nonlinearity. To demonstrate the
effectiveness of the designed ACS-PID controller, a comparison with the PID tuned by the
optimization process via Bacterial Foraging BF-PID is done under different operating
conditions and parameter changes. The results prove that the proposed method is very
useful in tuning the ACS-PID controllers for the load frequency control (LFC) of the Egyptian
Power System.
| page 52
11:30 am – 13:30 pm
Bern Hall
Session M4: Electrical Drives
Chairmen:
Prof. Dr. Yasser G. Desouky
Arab Academy for Science,
Technology & Maritime Transport
Prof. Dr. Mohamed A. ElSayyad
(#009) Designs of Electro-Mechanical Batteries for low earth orbit
satellite
Ahmed M Atallah, M. A. L. Badr and Mahmoud M. Kashef
M4: Electrical Drives (1/6)
ABSTRACT
Chemical batteries have many problems specially when used with satellites. They have
limited life because of fast charge/discharge rate, more size and they need large solar
array for power storage. Electromechanical batteries overcome many of these problems
especially when used in low earth orbit satellites (LEO) due to unlimited
charge/discharge cycle during satellite life time, higher efficiency, and more discharge
depths. This paper presents aspect of the design solution of permanent magnet
synchronous machine (PMSM) with optimal dimension using different methodologies
and selections of material such as carbon AS4C for flywheel which will achieve the
required high energy storage with minimum flywheel diameter and weight compared
with other designs. Electro-Mechanical Battery (EMB) helps to increase time of
operation and minimize the weight of LEO satellite during the eclipse periods. This
paper compare and discusses the difference between the use of four types of PMSM
designs 1) surface permanent magnet machine, 2 ) Inset permanent magnet machine , 3
) Buried permanent magnet machine and 4 ) Halbach array machine.
(#253) Detection and Analysis of Performance of Three Phase
Induction Motor Subjected to Stator Inter-turn fault Motor Drive.
Hanafy Mahmoud, S.M El-Hakim, Adel Shaltout
ABSTRACT
The model of three phase induction motor under inter-turn fault is introduced in ABC
frame to study the steady state and transient performance of the faulty motor. A robust
inter-turn fault detection approach based on the concept of magnetic pendulous
oscillation [1], which occurs in induction motor under fault conditions, is used.
Additionally, an experimental setup is constructed in the laboratory to verify the validity
of the proposed method. The experimental results are close to the mathematical results
for healthy and stator inter-turn fault motor. The possibility of applying this technique
with PWM inverter fed motor is examined and it has been found that it becomes invalid if
the THD exceeds 2%.
| page 53
(#024) Voltage Sensorless PFC of 4-Switch 3-Phase IM Drive with
Sensorless Speed Control for Low Cost Applications
Haitham Z. Azazi
ABSTRACT
This paper presents a simple and novel line voltage sensorless power-factor
correction (PFC) control for sensorless speed controlled four switches three
phase inverter (FSTPI) fed induction motor drive for low cost commercial
applications. The main novelty of the proposed method is that there is no line
voltage sensor, which can help to reduce the total cost. Thus, this technique
reduces the number of sensors required, and achieves the noise isolation
between the power circuit and the controller. Furthermore, the proposed
method is implemented using a zero-crossing processing, which allows a greater
accuracy than other methods. The improved power quality converter makes the
input power factor unity and also reduces the total harmonic distortion (THD) of
input supply current. The Model reference adaptive system (MRAS) is used as a
speed estimator and the motor is fed from an FSTPI instead of a conventional
six-switch three-phase inverter (SSTPI). Experimental studies have been carriedout for verifying the operation performance of the proposed drive system under
different operating conditions using a DSP 1104 evaluation board.
(#029) Open-Circuit Faults Diagnosis in VSI-Fed Three-Phase
Induction Motors
Arafa S. Mohamed, Haitham Z. Azazy and Ashraf S. Zein El Din
ABSTRACT
In this paper, a simple diagnostic and detection method, that allows the realtime detection and localization of single and multiple open-circuit faults in VSI
for a three-phase induction motor drive system using only the motor phase
currents, is presented. An experimental system based on a floating point Digital
Signal Processor (DSP) is established in the laboratory. Several experimental
results under different operating conditions are presented, proving the fault
diagnostic algorithm effectiveness, its relatively fast detection time and its
robustness against false alarms.
| page 54
(#141) Outer Rotor Flux-Switching Permanent Magnet Generator
for Direct Drive Wind Energy Applications
Essam E. M. Mohamed
ABSTRACT
This paper presents the design of flux-switching permanent magnet machines
suitable for wind turbine applications. The design presents an outer rotor fluxswitching generator based on finite element analysis. The key features of the
proposed design are; outer rotor structure and direct driven capability. The
analytical sizing equations are presented, then the finite element analysis is used
to optimize the generator performance. The performance of the generator is
examined when connected to an isolated resistive load and an isolated full-wave
rectifier.
(#239) Real Time Robust Position Controller for a Cart Moved by a
DC Motor through MATLAB
Tarek H. Mohamed, Essam H. Abdelhameed, and Ammar M. Hassan
ABSTRACT
In this paper, a new robust technique has been employed to control the mover
position of a cart driven by an armature controlled DC motor. The proposed
control technique consists of a position velocity (PV) control method cascaded
with a model predictive controller (MPC). The MPC has been designed such that
the effect of load disturbance and the uncertainty due to motor parameters
variation could be reduced. A simplified motor model has been used in the MPC
structure to minimize the computational load. Digital simulations are provided
to validate the effectiveness of the proposed scheme. The performance
characteristics of the proposed scheme are compared to those obtained using
the conventional controller. The results show that the proposed system
possesses good robustness in face of uncertainties and good tracking performance.
| page 55
11:30 am – 13:30 pm
Basel Hall
Session PE4: Matrix Converters
Chairmen:
Prof. Dr. Essam Eldin M. Rashad
Prof. Dr. A. Diaa El-Qushairy
Tanta University
(#052) A Current Controlled High-Frequency AC Link Converter
for PV Interfacing System
PE4: Matrix Converters (1/6)
Nour El-Sayad, Mostafa I. Marei, and Ahmed A. El-Sattar
ABSTRACT
High Frequency AC (HFAC) link converters offer an attractive solution to interface the PV
system because of its compact HF transformer replacing the bulky power transformer.
The paper presents a current controlled HFAC link based on Matrix Converter (MC) to
interface the PV system with the grid. The proposed switching scheme for the MC is
based on the hysteresis current control and the sign of the input voltage waveform. A
strategy for controlling the HFAC link system to extract the maximum power by
regulating the terminal voltage of the PV system is presented. In addition, the voltage
fluctuations at the Point of Common Coupling (PCC), result from the variation of the
extracted active power, are mitigated. Simulation results based on MATLAB/SIMULINK
software are provided to verify the effectiveness and to evaluate the dynamic behavior
of the proposed PV interface system.
(#142) Robust Closed-Loop Current Control of Three-Phase Matrix
Converter Based Space-Vector Modulation
Alaa Eldien M. M. Hassan, Mahmoud A. Sayed, Essam E. M. Mohamed
ABSTRACT
This paper presents a study of matrix converters operating as a controlled voltage
source. Space-vector modulation is applied to make use of its inherent features over
other control techniques. Matrix converter is employed to convert the fixed magnitude
and frequency input voltages which are supplied by the utility grid into controlled
magnitude and frequency output voltages. The AC/AC matrix converter has been chosen
for this process because of its inherent features over traditional converters such as the
reduced harmonics in both output and input sides. The Matlab/SIMULINK platform is
used to simulate and investigate the system performance based on various changes in
the magnitude and frequency of the load current.
| page 56
(#133) A Simple Control System for Sparse Matrix Converter to
Interface PMSG with the Grid
Ahmed Mohy, Mostafa I. Marei, and Ahmed A. El-Sattar
ABSTRACT
This paper presents a simple control system for Sparse Matrix Converter (SMC) to
interface Permanent Magnet Synchronous Generator (PMSG) based wind turbine
unit with the power grid. A carrier based PWM technique is extended and
adopted for the SMC. Details of the proposed switching strategy and derivations
of the modulation functions for both the rectifier and inverter stages of the SMC
are presented. The inverter stage is controlled to regulate the speed of the PMSG
for maximum power extraction. In addition, the rectifier stage of the SMC is
controlled to deliver the generated active power from the PMSG to the grid at the
required power factor to satisfy the reactive power demand. The proposed
control system is capable to manage active and reactive power flow in a
decoupled manner. The injected reactive power to the grid is restricted by the
limit on the power factor angle of the rectifier stage. Numerical simulations are
conducted to investigate the effectiveness and the fast dynamic performance of
the proposed interface system.
(#177) Space Vector PWM Technique for Three- to Seven-Phase
Matrix Converters
Sherif M. Dabour, S. M. Allam and Essam M. Rashad
ABSTRACT
This paper presents Pulse Width Modulation (PWM) control technique for three to
seven-phase matrix converters. These proposed PWM techniques are based on
space vector modulation (SVM). The converter switching states in direct
modulation is presented and organized into groups. However, the fulfilment
technique is based on the indirect equivalent topology, which model the
converter as two independent stages perform rectification and inversion stages.
This technique is called Indirect SVM (ISVM). In this paper, two schemes of ISVM
are proposed. The first scheme maximizes the voltage transfer ratio (VTR) of the
MC but it produces unwanted low order harmonics. The second scheme generates
sinusoidal output voltage waveforms; the cost is a reduction in the VTR of this
configuration in linear mode. The viability of the proposed technique is proved
using experimental results.
| page 57
(#208) Complete Solutions for Stepped SHEPWM Technique
Applied to Multilevel Inverter
Gamal M. Hashem, Mostafa I. Marei & Ramy M. Hossam
ABSTRACT
The Stepped Selective Harmonic Elimination Pulse Width Modulation (SSHEPWM)
technique is widely used in recent years for eliminating preselected lower order
harmonics with controlling the fundamental voltage component for multilevel inverter.
The main difficulty associated with this technique is calculating the switching angles for a
wide range of the modulation index (M). Solution of the problem relies on iteration
methods or optimization techniques are suffering from large computational time,
dependent on equations roots initial values and limited range of M have practical
switching angles solutions. This paper proposes a novel generalized empirical formula for
calculating the initial values of the switching angles at zero M in the case of the
SSHEPWM technique based on the Newton Raphson method. The proposed formula
guarantees solution set at a low computational time for the complete range of M.
Theoretical, simulation and experimental results validated the proposed algorithm.
Selected results are reported.
(#278) Complete Solutions for Selective Harmonic Elimination
PWM Technique Applied to AC/AC Voltage Controller
Gamal M. Hashem
ABSTRACT
Selective Harmonic Elimination Pulse Width Modulation (SHEPWM) technique is widely
used in recent years for eliminating preselected lower order harmonics with controlling
the fundamental voltage component for AC/AC converter output voltage. The main
difficulty associated with this technique is how to calculate the switching angles for a
wide range of the modulation index (M). Solution of the problem relies on iteration
technique such as the Newton Raphson method. To insure convergence for such
method the initial values of the switching angles must be chosen very close to the exact
solution values. This paper proposes a novel generalized initial guessing empirical
formula for calculating the initial values of the switching angles in the case of the
SHEPWM technique based on the Newton Raphson method. The proposed formula
guarantees practical solutions sets with low computational time for the complete range
of M. Theoretical, simulation and experimental results validated the proposed formula.
Selected theoretical, simulated and experimental results were reported.
| page 58
11:30 am – 13:30 pm
Zurich_1 Hall
Tutorial: Smart Grid
Chairmen:
Prof. Mohmed M. Sallam
Prof. Fahmy M. Bendary
Helwan University
Benha University
Smart Grid - Infrastructure and Future Innovation Application in
Power System
Moustafa M. Eissa (Helwan U)
Tutorial : Smart Grid
ABSTRACT
The lecture is a summary for a project established at Faculty of
engineering-Helwan University. The smart grid and the wide area
monitoring system on the Egyptian 220kV/500kV power Zone Grid
are established by deploying many devices from the family of the
PMUs and synchronized with the GPS on the 220kV/500kV
Egyptian Grid by collaboration with the Egyptian Electricity
Company. The system can monitor many parameters such as
(Voltage, Frequency, and Angles) in real time from many devices.
The system is with a good infrastructure for researchers in local
universities
and
institutes
inside
Egypt
and
outside
implementing many power and communication techniques.
for
| page 59
11:30 am – 13:30 pm
Zurich_2 Hall
Session PS4: PS Dynamics & Stability
Chairmen:
Prof. Dr. Nabil Abbasy
Prof. Dr. Rizk Hamouda
(#070) Enhancement Of Power System Performance And Voltage
Stability Using High Side Voltage Controller
PS4 PS Dynamics& Stability (1/7)
H. A. Khattab, A. F. Nasef, G. A. Morsy
Menoufia University, Egypt
ABSTRACT
This paper describes a high side voltage controller (HSVC) construction,
implementation and performance study for a synchronous generating unit
connected to an infinite bus power system via a transformer and a doublecircuit transmission line. In addition to enhance the system performance, the
HSVC can improve power system voltage stability by adding supplemental
control to conventional generator excitation system. The simulation results
using detailed non-linear model for the system with: a conventional automatic
voltage regulator (AVR), power system stabilizer (PSS) and HSVC are obtained.
The performance of the system with various controllers is analyzed using the
concept of damping and synchronizing torques. The effects of system loading,
parameters, controllers gain on these torques are studied. The results illustrate
the superiority of HSVC to enhance the system performance as well as its
voltage stability when subjected to different disturbances.
(#184) Design of PID Controller for Power System Stabilization
Using Ant Colony Optimization Technique.
H. I. Abdul-ghaffar
E. A. Ebrahim
Electronics Research Institute
M. Azzam
ABSTRACT
This paper presents new artificial intelligent technique called ant colony
optimization (ACO) for stability of the power system. It used for tuning the PID
controller parameters. Simulation results are introduced with and without the
proposed controller. Also, a comparison study is introduced when using
classical PID controller and then when using ACO technique. The results show
that using of the PID controller tuned by ACO is capable of guaranteeing the
stability and performance of the power system better than the PID-PSS based
classical PID controller.
| page 60
(#085) Transient Fault Ride-Through of a Multi-Generators Wind
Farm Using a Self-Tuning Fuzzy PID Controller
Helmy. M. El_ Zoghby, A.M. Abdel Ghany, MIEEE
ABSTRACT
This paper presents the design steps and carries a comparative study between a self
tuning fuzzy Proportional-Integral-Derivative (PID) and the classical PID controllers. PID is
considered here because of its wide use in the industry, simple structure and easy
implementation. It is also preferred in plants of higher order that cannot be reduced. The
design procedure is performed through two steps. In the first step, the PID gains are
obtained using MATLAB software tuning option denoted by PID. In the second one, a
fuzzy self tuning is designed to tune such gains. The developed approach is applied to a
wind farm model that includes an active-stall wind turbine with three different types of
generators; these generators are three-phase synchronous generator, three-phase
squirrel-cage induction generator and three-phase doubly-fed induction generator. All
generators are connected in parallel at the point of common coupling (pcc) and
connected to the utility grid. This model is a simple representation of the actual wind
farm of zafarana wind farm , which is the biggest wind farm in Egypt and further to use it
in different kinds of simulations, and display the difference in responses among all
generators in normal and abnormal conditions. Also, this paper describes the simulation
model of a pitch controller or the so called transient fault controller that enables the wind
farm system to ride through transient faults, and allow the turbine to sustain operation in
case of faults. The design of the controller is described and its performance assessed by
simulations. The self-tuning is performed on-line with the system under control to
achieve minimum steady-state error and improve the dynamic behavior (overshoot and
stability). Comparison between the system response before adding a transient fault
controller in case of three-phase short circuit, and after adding the proposed controller
will be done.
(#275) Real-Time Tuning of Power System Stabilizer
Hany A. Abdelsalam
G. Kumar Venayagamoorthy
Kafrelshikh University, Egypt
Clemson University, USA
ABSTRACT
This paper presents a real-time implementation of power system for tuning the power
system stabilizer (PSS) using particle swarm optimization method (PSO). The PSSs
parameters are tuned in the continuous time using the real-time digital simulator (RTDS).
A MATLAB-based PSO algorithm is used and interfaced with the RTDS system. RTDS script
is achieved for the real-time tuning of the PSSs parameters. The two-area power system is
simulated and the best PSSs parameters are obtained in the real-time. The tuned PSSs
parameters are verified by comparing the generators’ speed deviation with that obtained
in literature.
| page 61
(#114) Variation of Power System Equilibria due to Different
Loading Patterns
Mohamed Shaaban
Azza ElDesouky
UniversitiTeknologi Malaysia
Port Said University, Egypt
ABSTRACT
Increased loading of modern power systems are creating unusual operating scenarios
that were not contemplated, at the planning stage. This could push the system
dynamics further to the boundaries jeopardizing its stability. It is therefore important,
to understand the system behavior under various loading conditions. In this paper, the
impact of various loading patterns on equilibrium points of the power system is
investigated. The classical dynamic model of the power system is adopted and an
energy function is constructed to approximate the stability boundary of the system.
The stable equilibrium point (SEP) is computed and the controlling unstable
equilibrium point (UEP) is determined using the BCU method. The proposed algorithm
is applied to the WECC 3-machines, 9-bus system. It is shown that equilibria vary
widely according to load composition and generation dispatch.
(#197) Comparison between Wind Farm Aggregation Techniques
to Analyze Power System Dynamics
Ahmed M. Atallah , Mona A. Bayoumi
Ain-Shames University, Egypt
ABSTRACT
Wind farms begin to influence the power systems with the increasing amount of wind
power penetration. The study of such influence justifies the need of a dynamic wind
farm model comprising a large number of generators, but detail models require high
simulation computation time. Wind farm aggregation technique is required to reduce
the model order while maintaining its accuracy. Different wind farm techniques have
been proposed to simulate and analysis wind farm dynamics. In this paper a
comparison between some of these techniques are presented. Simulation have been
carried out for these techniques and compare them using different effects such as
wind farm power, reactive power and system dynamics, besides the effect of varying
variance on these techniques.
| page 62
(#179) Application of Superconducting Magnetic Energy Storage
(SMES) to Improve Transient Stability of Multi-Machine System
with Wind Power Penetration
Sayed M. Said, Mohamed M. Aly and Mamdouh Abdel-Akher
ABSTRACT
This paper presents the impacts of superconducting magnetic energy storage (SMES) to
improve the transient stability of multi-machine system with wind power penetration.
The wind turbine (WT) used in this paper is of variable speed doubly fed induction
generator (DFIG). SMES system consists of step down transformer, power conditioning
system, DC-DC chopper, and large inductance superconducting coil. The 9-bus IEEE
system was used as the study case. Fuzzy logic controller (FLC) used for DC-DC chopper to
control the power transfer between the grid and SMES coil. The FLC is designed so that
the SMES can absorb/deliver active power from/to the power system. On the other hand,
reactive power can be delivered/absorbed to/from the power system according to the
voltage difference between the SMES voltage and DC link voltage. Two inputs were
applied to the FLC; wind power and SMES current variations. This technique of two inputs
was proved to enhance the control performance. Detailed simulation is carried out using
Matlab/Simulink and Simpowersystem package.
| page 63
15:15 pm – 17:15 pm
Bern Hall
Session RE1: Photovoltaic Systems
Chairmen:
Prof. Dr. Ahmed Bahgat
Prof. Dr. Adel Emara
Cairo University
(#068) Evaluation
RE1: Photovoltaic Systems (1/7)
0B
of 12 Models to Estimate Monthly Mean Daily
Global Solar Radiation on a Horizontal Surface in Alexandria
Ahmed R. Abdelaziz, and Shimaa A. Elagamy
26B
57B
ABSTRACT
8B
Solar radiation data are of great significance for solar energy system design. This study
aims at developing and calibrating new empirical models for estimating monthly mean
daily global solar radiation on a horizontal surface in Alexandria, Egypt. Day length
hours, sun height, day number, and declination angle calculated data are used for this
purpose. A comparison between measured and calculated values of solar radiation is
carried out. It is shown that, all the proposed correlations are able to predict the global
solar radiation with excellent accuracy in Alexandria.
(#073) Sizing
1B
and Economic Analysis of Standalone PV Systems
for Residential Utilization
Sherif M. Imam
Ahmed M. Azmy, and E.
Rashad
Kafrelsheikh University, Egypt
ABSTRACT
89B
This paper presents a methodology to define the best size of a standalone PV system
and analyze the economics of the entire system. Simplified mathematical expressions
are derived for sizing each subsystem in a generic form. The study is based on a 5
kWh/day residential load with a peak power of 1300W. The load peak power was
taken into consideration when sizing the inverter capacity. The relationship between
the depth of discharge (DOD) and the battery life-cycle time is studied to obtain the
optimum battery bank size for minimum cost. The cost of each system component is
analyzed based on international prices and aggregated to obtain the overall cost of
energy (COE). The results of the analysis show that the COE relies heavily on both the
size and the designed voltage of the battery bank, which in turn depends on the
storage hours, charger size and the (DOD) value.
| page 64
New Evolutionary Methodology For Optimizing the
Emergency Photovoltaic System For general surgery New
Building-Zagazig University Hospital
(#105) A
Ahmed Fathy,Mahdi M. El-Arini, and Ahmed M. Othman
University of Zagazig, Egypt
ABSTRACT
In recent years the solar energy plays as one of the most important sources of the
electric energy. It’s vital point to optimize the operation of the Photovoltaic (PV) array
which means maximizing the output power with allowable minimum cost. This paper
presents a new evolutionary technique for optimizing the PV system as an emergency
unit. A constrained objective function for the PV module output power to be maximized
is proposed. A constrained objective function for the PV system Life Cycle Cost (LCC) to
be minimized is also proposed. A new optimization algorithm, Artificial Bee Colony
(ABC), is used for solving the two proposed objective function. Finally an economic
comparison between the proposed emergency PV system and the emergency diesel
generator is performed for general surgery new building - Zagazig university hospital
Load. The obtained results show that the usage of the proposed emergency PV system
instead of the diesel system will save about 13.08673% in Life Cycle Cost and it is more
reliable and healthier than the emergency diesel one.
(#272) Utilizing
the Grid-Connected Photovoltaic System for
Reducing Transformer Inrush Current
Hany A. Abdelsalam
Kafrelshikh University, Egypt
Abdelsalam Ahmed
Abdelaziz
Egypt
Almoataz Y.
Ain Shams University,
ABSTRACT
Integration of photovoltaic (PV) energy into the electrical power system is increasing
with the development in the PV technology. Transformer magnetizing inrush current
problem occurs due to switching the transformer into the service. This paper proposes
an inrush current reduction technique using the PV power. The proposed procedure is
to apply an opposite flux on the transformer using the PV power, then connect the
transformer with the electrical power network at a suitable instant of the grid voltage
waveform. The switching instant depends upon the flux produced in the transformer
primary winding by the PV system. The proposed procedure is applied on a single phase
example and simulated in MATLAB R2012a/SIMULINK. The simulation results illustrate
the suitable instant of switching to reduce the magnetizing inrush current and the
corresponding total harmonic distortion (THD).
| page 65
(#200) Modeling
and Performance Analysis of Photovoltaic Arrays
Under Shading Conditions
Nader Tawfik, Walid A. Omran, Somaya A. Shehata and Hamdy S. ElGoharey
ABSTRACT
Photovoltaic (PV) systems are gaining more attention worldwide. These systems are
relatively expensive, and thus, efficient generation of electricity from these systems is
of great importance. One of the most dominant factors that affect the generation of
electricity from PV systems is the shading of PV arrays. The aim of this paper is to
present the detailed modeling of photovoltaic (PV) cells, modules and arrays. The paper
also presents a comparative study of array configurations under different shading
patterns in order to identify the configuration that is comparatively less susceptible to
shading problems. The PV cell is modeled using the two diode model in the
MATLAB/Simulink environment. The cell model is extended to represent the model of
the PV module and array. Three array configurations are considered for comparisons
under different shading conditions. These configurations are series-parallel (SP), bridgelinked (BL), and total-cross-tied (TCT). It is found that in most cases, the TCT
configuration has a superior performance over the other two configurations in most
shading scenarios especially the complex ones.
(#215) Quantitative
Characterization and Selection of Photovoltaic
Technologies
T. Abdo, and M. EL-Shimy
ABSTRACT
Currently, there are many photovoltaic (PV) technological alternatives and a huge
number of PV modules in each technological class. In addition, the characteristics of
these technologies and modules are significantly different. Consequently, the design
engineer faces a challenge in selecting the best PV technology and module for a given
project. Each project has a specified design criteria and constraints. Therefore, the
selection of an appropriate PV technology/module differs from project to project. This
paper provides a decision aid in this discipline through an in-depth quantitative siteindependent characterization and selection of various PV technologies and modules.
The manuscript provides essential data for designer, researchers, and students.
Significant outcomes and conclusions are presented in the conclusions section.
| page 66
of Weather Temperature on The Performance
Characteristics of Different PV Modules at Different Locations in
Egypt
(#256) Effect
A. Hossam El-din and C. F. Gabra
Ahmed Hamza. H. Ali
Egypt-Japan Univ. of Science and Technology,
Egypt
ABSTRACT
Study of the factors and parameters that affect the performance of photovoltaic (PV)
cells is significantly important to help researchers to understand , design, develop, and
optimize their use .PV module temperature is a function of the incident radiant power
density, the output electrical power and the thermal properties of the semiconductor
material used in the manufacture of the module. Only part of the incident solar
spectrum is converted into electricity, while the rest is diffused as heat. This heat
causes the increase of the module temperature which leads to the decrease of the
module efficiency and output power. This study investigated ,experimentally and
theoretically, the effects of ambient air temperature on the performance of thin film
photovoltaic (PV) panel under real outdoor conditions in humid harsh climate of Borg
Al-Arab-Alex-Egypt. The experimental study investigated the effect of ambient air dry
bulb temperature on performance of PV panel. Theoretical study predicted the
performance of the PV panel at various metrological conditions at different locations
inside Egypt. In addition, the model investigated the characteristics and performance of
the monocrystalline and polycrystalline solar panels by using PSIM simulation package.
| page 67
15:15 pm – 17:15 pm
Basel Hall
Session PE5: Applications of Power Electronics
PE5: Applications of Power Electronics (1/6)
Chairmen:
Prof. Dr. Amr Amin
Prof. Dr. Ahmed M. Assaad
Helwan University
(#249) Modeling
and Simulation of Induction Heating Systems
Based on Pulse Density Modulation Technique
Ahmed Gaber Abdelmonem, Ahmed Elserougi, and Medhat El-Geneidy
ABSTRACT
This paper presents modeling and simulation of an effective control scheme for a
series-resonant voltage-source inverter based on pulse density modulation (PDM)
control strategy for induction heating applications. The proposed control strategy
ensures well regulated output power as well as zero-current (or voltage) switching,
which reduces the switching losses as it mainly depends on switches curents, and
voltages. Power feedback, pulse density modulation control and phase angle feedback
are used in the proposed approach to achieve proper load power regulation and unity
power factor. Simulation models have been built using Matlab/Simulink software
package.
and Reactive Power Control of Micro-Grids with
Multiple Distributed Generation Systems
(#139) Active
Ahmad Eid, and Mamdouh Abdel-Akher
ABSTRACT
This paper presents modeling, control and performance of a DC micro-grid connected
to the utility under variable conditions. This micro-grid consists of 60kW wind turbine
(WT) energy conversion system, 40kW photovoltaic (PV) panel and 40kW fuel cell (FC)
module. The WT energy conversion system is controlled by the indirect field
orientation control (FOC) method to extract maximum power from the wind by
controlling the shaft speed of the squirrel-cage induction generator (SCIG). The PV
module is controlled to generate the available maximum power using Perturb and
Observe (P&O) Maximum Power Point Tracker (MPPT) control considering
environmental conditions. The fuel cell, with a current controlled DC/DC boost
converter, supplies power only when the load demand exceeds the total power of the
WT and PV systems. All the distributed generations (DGs) are connected to a 500V DC
bus. A bidirectional 6-pulse PWM converter connects the micro-grid to utility using
the natural frame control (NFC) technique. The bidirectional converter controls the
DC bus voltage, power and reactive power transfer to/from the utility according to
the available power from the DG units and the total load demand. Different case
studies are simulated to test the performance of the micro-grid in all possible
operating conditions.
| page 68
PE5: Applications of Power El. (3/6)
(#233) Fuel
Cells Power Control with Current Ripple Reduction
Topology
E K Hussain
University of Aswan, Egypt
ABSTRACT
This paper presents a single phase power converter and control topology suitable for
Fuel Cells (FCs) applications. The proposed converter is a two-stage, a dc/dc boost
converter and a dc/ac H-bridge. The main aims of the control topology are
transferring the power from the FCs to the grid, reducing the dc ripple in the FCs
current and avoiding high dc link voltage. Moreover, it studies the effect of the system
cross over frequency on the dc link voltage. The main advantages of the proposed
topology are simple, low dc FCs current ripple, wide range of active and reactive
power control and optimizing the crossover frequency of the system to avoid high dc
link voltage.
(#277) Active
Filters Application For Metro A.C Substations
Ashraf M. Rezkalla
Manager of El Metro transformers substation, Egypt
M.A.L. Badr, Adel Y. Hannalla, M.A. Abdel Rahman, and M. El Shafey
ABSTRACT
In Cairo METRO subway system, diode rectifiers are commonly used in the front end
of a power converter as an interface with the electric utility. Rectifiers are nonlinear
in nature and, consequently, generate harmonic currents into the ac power source.
The nonlinear operation of the diode rectifiers causes highly distorted input current.
The non-sinusoidal shape of the input current drawn by the rectifiers causes a
number of problems in the sensitive electronic equipment and in the power
distribution network. The distorted input current flowing through the system
produces distorted voltages at the point of common coupling (PCC). The
recommended practice, IEEE- 519, and IEC 1000-3 has evolved to maintain utility
power quality at acceptable levels. In order to meet requirements, a cost-effective
and economical solution to mitigate harmonics generated by power electronic
equipment is currently of high interest. One approach is to us 12-pulse converter
configuration using a phase shift power transformer to achieve low harmonics at the
ac line current and low ripple at the dc output voltage. This method is currently used
in Metro system rectifier station to improve system power quality. The proposed
solution for system power quality improvement in this research is to use the usual
12-pulse converter to active harmonic filter by using micro controller model
technique. This system reduce THD in the ac source current from 9% to 3% and lower
ripple in the dc output voltage with the advantage of simple, lower source voltage
THD, size, and cost.
| page 69
(#136) Dynamic
Reactive Compensation Requirements at the
Rectifier End of an LCC HVDC Link Connected to a Weak AC
System
Abosalah ElMehdi
Brian K. Johnson
Azzaytuna University, Libya
University of Idaho, USA
ABSTRACT
Line commutated current source converter-based high voltage direct current (LCC
HVDC) systems are being considered for the transfer of power from remote wind
resources to existing ac transmission systems. The rectifier terminals of these systems
are connected to weak ac systems. High voltage direct current (HVDC) system design
engineers have extensive experience implementing dynamic reactive compensation
solutions when the inverter end of a system is weak, but the guidelines they use for
inverter operation overstate the reactive compensation needed for rectifier
operation. A modified CIGRE (Conseil International des Grands Réseaux Electriques)
HVDC benchmark model implemented in the PSCAD/EMTDC program is used to study
the impact of varying amounts of dynamic reactive compensation on performance
during rectifier operation. Simulation results also compare the effectiveness of
synchronous condensers (SCs) versus fixed capacitors (FCs) in improving the dynamic
performance of an LCC HVDC transmission system when its rectifier terminal is
connected to a weak ac system. After that, recommendations for the amount of
dynamic compensation required to meet performance objectives as a function of
short circuit ratio (SCR) will be discussed. Determination of the amount of dynamic
reactive compensation needed at the rectifier terminal is based on the following
dynamic parameters: the magnitude of the first peak of the temporary overvoltages
(TOVs) of the rectifier ac voltage following disturbance and time for the dc system to
reach 80% of pre-disturbance dc power transfer after the clearing an ac fault. An
effective short circuit ratio (ESCR) for best operation will be calculated based on the
selected value of the dynamic reactive power compensation rating.
(#116) Backstepping
Nonlinear Control Strategy for Dynamic
Voltage Restorer Using Multilevel Inverter
Naggar H. Saad
ABSTRACT
Power quality is one of the major concerns in the power distribution systems. The
problem of voltage dips and swells and its impact on the sensitive loads are well
known and need urgent attention for its mitigation. There are various methods for the
mitigation of the voltage dips and swells. One of the most popular methods for this
mitigation is the Dynamic Voltage Restore (DVR), which is considered fast, flexible and
efficient method. This paper proposes nonlinear backstepping control method using
voltage and current control strategies for the DVR. Different Multi Level Inverters
(MLI) with different switching frequencies are used with DVR to minimize error and
reduce harmonics content generated by the DVR. The performance of the proposed
controller has been verified using MATLB/SIMULINK software and the results proved
the efficiency of the suggested DVR control algorithm for different voltage dips.
| page 70
15:15 pm – 17:15 pm
Zurich_1 Hall
Session PR1: Line Fault Locators
Chairmen:
Prof. Dr. Ibrahim A. Megahed
Prof. Dr. Hanafy M. Ismail
(#030) Comprehensive
Fault Location Scheme for Power Transmission
lines
Doaa Khalil Ibrahim, and Essam El-Din Abo El-Zahab
PR1: Line Fault Locators (1/6)
Ahmed Galal Ahmed
Egyptian Electric Transmission Company, Egypt
ABSTRACT
A comprehensive two-terminal impedance based fault-location scheme is presented
in this paper which takes into account the distributed parameter line model. The
scheme utilizes unsynchronized measurements of voltages and currents from the two
ends of a line. The synchronization angle is calculated using symmetrical components
transformation theory. The proposed scheme integrates several fault location
algorithms. In one of them, Takagi method is used taking into account the effect of
distributed capacitance when the communication link between sending end and
receiving end fails. Another algorithm is embedded in the proposed scheme to
accurately locate ground and phase nonlinear high impedance faults using zero and
negative sequence currents gathered from the two terminals within a maximum time
of 2 cycles. The proposed fault-location scheme has been thoroughly tested using ATP
versatile simulations of faults on transmission lines. The presented evaluation shows
the validity of the developed fault-location scheme and its accepted accuracy.
(#144) Distance Protection
of AC Feeding System for Electrified
Railways
M. Ezzat1, H. E. A. Talaat1, and M. Abdelrahman1
1
2
M. Gehad2
Alstom Transport Company, Egypt
ABSTRACT
The function of an AC traction system is to deliver power to the locomotives, the 25
kV, 50 Hz AC electrification system has been developed specifically for railway
traction purposes. Traction network protection, both at the substation and along the
track, is necessary to prevent injury to personnel and to limit equipment damage
after faults and overloads. This paper presents a model of a 25 kV, 50 Hz AC traction
system using simulink software package. The simulation includes a protection system
using distance relays. The model introduces a proper setting value for the distance
relay. Hence, it has the ability to detect different fault conditions.
| page 71
(#195) Wavelet
Based Analysis for Transmission Line Fault
Location
Mazen Abdel-Salam, Adel Ahmed, and Wael Ahmed
Assuit University, Egypt
ABSTRACT
This paper presents wavelet based analysis for transmission line fault location. Faults in
power transmission lines cause transients that travel at a speed close to the speed of
light and propagate along the line as traveling waves (TWs). Traveling wave theory is
utilized in capturing the travel time of the transients along the monitored lines between
the fault point and the protective relay. This will help in proposing an accurate fault
location technique based on high frequency components of fault current. Time
resolution for these components is provided by the wavelet transform. This approach
has the advantages of being independent of the fault impedance and fault inception
angle. The application of the proposed technique for typical faults is illustrated using
transient simulations obtained by MATLAB Simulink program.
(#065) Earth
Fault Location in Medium Voltage Networks
considering Possible Load Transformer Connections
Mahmoud El-Sad, Nagy Elkalashy, Tamer Kawady, and Abdel-Maksoud
Taalab
ABSTRACT
In this paper, an earth fault location algorithm is proposed using single end
measurements. The possible varieties of the load transformer connectivity are studied
due to their remarkable influences on the earth fault current direction in the network.
The proposed algorithm depends on equating the computed sequence current
components at the fault point to deduce the earth fault location function. This results in
an accurate fault location computation that is not affected by the fault impedance. The
performance evaluation is carried out considering a 11kV overhead feeder simulated by
the ATP/EMTP program. Case studies considering different fault conditions as variations
of fault distances, fault inception angles, fault resistive/impedance values and
resistive/arcing faults are considered. Moreover, different system configurations such
as different load levels and various transformer connections are considered. The results
provide evidences of the efficacy of proposed earth fault locator.
| page 72
(#072) Sequence
Components-Based Fault Location Technique for
Distribution Systems Considering Time Varying Loads
F. M. Abo-Shady, M. A. Alaam, and Ahmed M. Azmy
ABSTRACT
This paper presents a sequence components-based analytical technique for fault
location in distribution systems. The technique considers different distribution
system characteristics including non homogeneity in feeder sections, load distribution
along the feeder, laterals are tapped at various nodes and load variation. The
proposed technique depends on sequence components and uses a power flow
analysis based on ladder technique for compensating the load variation. To evaluate
this technique, it is implemented on 11 kV feeder using ATP/EMTP package. Singleline-to-ground and three phase faults with various fault resistance values are
simulated. To examine the technique accuracy with load variation, four loading cases
are included. The results achieved ensure the validity and ability of the proposed
technique to reduce the error in determining fault location.
(#178) An
Improved PMU-Based Fault Locator Coupled with
Robust Fault Classifier for Three-Terminal Transmission Lines
Bassam A. Hemade, Ali H. Kasem Alaboudy, Hossam El-Edin M. Attia
Suez University, Egypt
Mohamed M. Mansour
ABSTRACT
In this paper, a fault locator algorithm equipped with an enhanced robust fault
classifier technique is developed to identify the location and type of faults in threeterminal transmission lines. The algorithm is based on distributed transmission line
parameters and synchronized phasor measurement units (PMUs). The fault classifier
and phase selection scheme, based only on current magnitudes, is proposed to
enable circuit breaker single-pole tripping. The proposed algorithm is examined on a
345 KV transmission line. PSCAD and MATLAB environments are used for system
simulation. The given results ensure the robustness and correctness of the developed
algorithm under various fault types, locations, and fault path resistances.
| page 73
15:15 pm – 17:15 pm
Zurich_2 Hall
Session PS5: Power Quality
Chairmen:
Prof. Dr. Mohamed Tantawy
Prof. Dr. Hassan Eltamaly
Mansoura University
Minia University
(#077) Harmonics
Mitigation of Industrial Distributed Networks
Using Harmonic Blocking Compensators
19B
PS5: Power Quality (1/7)
Shady Hossam E. Abdel Aleem
15th May Higher Institute of Engineering, Egypt
79B
Brunel University, U.K.
Ahmed Mohamed Ibrahim
49B
80B
ABSTRACT
107B
This paper presents a passive harmonic blocking compensator (PHBC) for harmonic
suppression and reactive power compensation in distribution systems. PHBC composed
of a line series filter tuned to the fundamental frequency and a shunt passive filter.
FORTRAN Feasible Sequential Quadratic Programming (FFSQP) is used as an
optimization tool to find the proper sizing of parameters of the suggested filter for
minimizing the supply current total demand distortion (TDD), where maintaining a given
power factor at a specified range is desired. The optimal design of the PHBC, the
contribution of the newly developed method and its feasibility are presented in two
study cases.
(#160) Mitigation
20B
of Harmonic Distortion in VFD-based Industrial
Distribution System with PFC
Abdullah Elsawalhy
Sayed Nagy
South Delta Elect. Dist.Co, Egypt
Mansoura University, Egypt Al-Azhar
University, Egypt
50B
Ahmed Faheem Zobaa
Ebrahim A. Badran
81B
ABSTRACT
108B
Industry developments may cause problems for the electrical power systems. The nonlinear loads are considered the main reason of these problems. Harmonics are the
major power quality problems in industrial and commercial power systems. This paper
presents the harmonic problem in a petrochemical plant in Egypt. This industrial
distribution system contains variable frequency drive (VFD) loads. The impact of power
factor correction (PFC) capacitors on the harmonic distortion and system resonance is
studied. The reduction of the harmonic distortion via multi-stages single tuned filter
design is proposed. ETAP is used for the simulation of the investigated test system. The
results show a highly reduction in 5th and 7th harmonic orders and the total harmonic
distortion. Also, the resonance is eliminated.
| page 74
(#130) Dynamic
Voltage Restorer for Deep Voltage Sags and
Harmonics Mitigation in Industrial Plant with Sensitive Loads
Doaa Khalil Ibrahim, and Ahmed Ibrahim
Ihab Hussein Ammar
El Araby Company for Lighting Technology, Egypt
ABSTRACT
Dynamic Voltage Restorer (DVR) is a fast, flexible and efficient solution for voltage
sag problem. Itisa power electronic based device that used to compensate voltage
sags and harmonics. The DVR has different system topologies for compensation by
using battery as an energy storage unit or by using shunt and series converters. In
this paper, the DC-DC boost converter is used to connect between shunt and series
converters, which allows the DVR to compensate deep sags for long durations. A
real case study of Egyptian industrial plant includesa lamp factory as a sensitive load
ismodeled and simulated using MATLAB/SIMULINK environment to test the
effectiveness of using different system topologies of DVR: a battery, shunt and series
converters, and finally shunt and series converters with boost converter.
Satisfactory performance is achieved using the topology of using shunt and series
converters with boost converter for compensating deep voltage sags and harmonics.
The financial assessment of using DVR is also investigated.
(#183) A
new Approach for Defining Three -Phase Power
Components based on the Instantaneous Power Theory: Part 1Analytical Study
2B
Hossam K. Youssef
Ayman Eisa, A. Elbahrawy, ,and Omar Fathy
Egyptian Atomic Energy Authority, Egypt
ABSTRACT
10B
This paper proposes a new approach for definition of power components in threephase four-wire balanced system under sinusoidal and non-sinusoidal condition.
This new instantaneous power approach for the calculation of power components
extends and adapts, for three-phase conditions, the procedure applied by Ref. [1]
for the quantification of power components in single-phase two-wire systems. In
this study, a new approach which based on the analysis of three-phase
instantaneous power flows of both fundamental and all harmonics of signals is
proposed.
| page 75
(#185) A
new Approach for Defining Three -Phase Power
Components based on the Instantaneous Power Theory: Part 2- A
case Study of sharing the harmonic Distortion Responsibility
23B
Hossam K. Youssef
Egyptian Atomic Energy Authority, Egypt
ABSTRACT
The aim of this paper is to present a method for determining the contribution of
harmonic distortions at the Point of Common Coupling (PCC) between the utility and
the customer in power distribution systems. This method is based on new definitions of
power components suggested by the same authors in [1]. By using this approach, not
only the sharing of harmonic responsibility can be distinguished, but also the quantity
and direction of power for each harmonic order can be determined. A case study
involving theoretical model at the IEEE Std. 1459-2000 [2] has been analyzed to verify
the accuracy of the proposed method. By finding the supply and load harmonic
contributions, it is possible to achieve fairer cost sharing through rate structure and
penalties, etc.
(#016) Voltage
24B
and Current Harmonic Suppression by Unified
Active Filter with New Control Strategy
Gaber El-Saady Ahmed
5B
86B
Ashraf Mohamed Hemeida
M. Nasrallah
ABSTRACT
12B
This paper proposes the unified active filter with specific control strategy for
suppression terminal voltage harmonic and current source harmonic. The effectiveness
and viability of the unified active filter has been verified by theoretical analysis and
simulation results.
(#134) Optimal
25B
Ayman A. Eisa, A. H. Elbahrawy ,and Omar Fathy
Allocation of Power Quality Monitors Considering
Voltage Sag Constraints
Asmaa A. Elsakaan
A. I. Elmitwally, and M. E. Elsaid
KafrelshiekhUniversity, Egypt
MansouraUniversity, Egypt
87B
ABSTRACT
13B
This paper addresses the problem of identifying the optimal locations for power quality
monitors (PQMs). A proposed approach is based on integer linear programming (ILP) to
solve PQMs problem. It gives the minimum number of PQMs and their locations at
variable voltage threshold values. The proposed method solves the PQMs problem for
different network configuration that ensures all fault positions are captured.
Performance characteristics prove that the proposed method is a competitive one
compared to other methods in the literature and guarantee complete observability
requirements of the whole power system. The method is efficiently applied to IEEE 30bus network.
| page 76
Thursday, December 25, 2014
9:00 am – 11:00 am
Bern Hall
Session RE2: Wind Systems Integration
Chairmen:
Prof. Dr. Ahmed R. Abul' Wafa
Prof. Dr. Adel Abu-Elela
RE2: Wind Systems Integration (1/7)
(#099) Improved
Menofia University
Modeling and Analysis of DFIG Loading
Capability Limits
M. Ahmed, M. EL-Shimy
M. A. Badr
Future University, Egypt
ABSTRACT
This paper presents a detailed mathematical model for accurately determining the
loading capability limits of doubly-fed induction-generators (DFIGs). Unlike the
previous models, this model takes into consideration the effect of losses, rotor power
flow, and power factor settings of the grid-side converter (GSC). The impact of various
variables and parameters on the loading capability is determined through parametric
analysis of the resulting limits. Simulation results show that DFIGs can provide a
continuous controllable reactive power support to electrical grids. In addition, the
results set also rules for enhancing the reactive power capability of DFIGs based on its
sensitivity to the various parameters and variables of the machine and its controls.
(#106) Consistence
of Wind Power Technologies with the Fault
Ride-through Capability Requirements
Nesma Ghaly
Mohamed EL-Shimy, Mahmoud Abdelhamed
Arab Contractors Company
ABSTRACT
This paper provides an overview of the requirements imposed by international
grid-codes for connecting large amounts of wind power to various electric power
systems. The main concern here is the fault ride-through (FRT) capability
requirements. The consistency of popular wind power technologies with the FRT
requirements is evaluated considering the German E.ON Netz code. This is
achieved through appropriate modeling and simulation of grid-connected fixedspeed and variable-speed wind power technologies. Two methods of evaluation
are presented in the paper. The results show some exceptional characteristics of
the doubly-fed induction-generator (DFIG) in comparison with the squirrel-cage
induction-generator (SCIG).
| page 77
The Ability of Mixed Wind Farm to Fulfill The
Requirements of Low Voltage Ride Through
(#126) Investigating
Ahmed. M. M. Rashad
Omar Noureldeen
Upper Egypt Electricity Distribution Comp.
ABSTRACT
Due to the increase in penetration of wind farms into electric grids, the ability of these
wind farms to fulfil the grid code requirements is required especially the capability of
wind farms to fulfil the low voltage ride through (LVRT) requirements. This paper
studies the impact of two limit curves of voltage pattern for fault events according to
the German grid code on three types of wind farm. The first wind farm consists of
double fed induction generator (DFIG) wind turbines only and the second wind farm
consists of squirrel cage induction generator (SCIG) only with STATCOM for reactive
power compensation while the third one is a mixed wind farm (MWF) consists of an
equal number of DFIG and SCIG without using STATCOM for reactive power
compensation. The simulation results of the three wind farms have been compared in
order to stand out or discover the ability of mixed wind farm to fulfill the requirements
of LVRT according to the Germany grid code.
(#148) Voltage
Stability Investigation of the Egyptian Grid with
High Penetration Level of Wind Energy
Hamdy S. K. El-Goharey, Walid A. Omran, Adel T. M. Taha
Ain-Shams University, Cairo, Egypt
Salwa M. El-Samanoudy
Egyptian Electricity Holding Company (EEHC), Egypt
ABSTRACT
There has been a rapid increase in wind turbine connection to distribution and
transmission networks in recent years. With individual wind turbines approaching the
multi - MW and the wind plants, as a result, approaching the output rating of
conventional power plants, a deeper under-standing of their potential impacts on
interactions with the bulk electric power system is needed. The increased penetration
makes the power network more dependent on, and susceptible to, the wind energy
production. As the wind power penetration into the grid increases rapidly, the influence
of wind turbines on the power quality and voltage stability is becoming more and more
important. The main objective of this study is to analyze the voltage stability of the
Egyptian Electrical Network with large scale wind power under normal operation and
under single contingency (N-1). The single contingency is defined as the loss of any
transmission line, transformer, or generator. In addition, the paper determines the size
of reactive power compensation devices (capacitors or STATCOM) that should be
installed at weak buses to prevent the voltage collapse.
| page 78
(#182) Effect
of Power System Parameters on The Temporary
Overvoltages in Grid-Connected Off-Shore Wind Farms
Eman A. Awad, Ebrahim A. Badran, Member, Fathi M. H. Youssef
ABSTRACT
This paper presents the effect of the power system parameters on the temporary
overvoltages (TOVs) in grid-connected off-shore wind farms. The dominant
parameters include; the cable length, the circuit breaker parameters such as the
poles closing span and the switching angle, and the source parameters such as the
system short circuit level and the system size. Alternating Transient Program
(ATP) is used in this study for simulating the test power system and the connected
off-shore wind farm. The results show the relation between the TOV magnitude
and the power system parameters.
of Large Penetration of Wind Energy on the
Performance of Electric Power Systems
(#187) Impact
A.S. Zalhaf1, Ayman hoballah and Ahmed M. Azmy
ABSTRACT
Wind energy represents one of the most important renewable energy resources
that can support electrical power systems. The behaviour of wind turbines
following contingencies may affect system stability. This requires an extensive
analysis of the possible effect of wind energy on the entire power system
performance. This paper investigates the overall effect of wind energy on power
system including the dynamic response. This is achieved by replacing
conventional generators gradually by wind turbine (WT). Also, the optimal
location of WT has been determined by checking the influence of wind energy on
steady state operation. In addition, the effect on total fuel cost is considered to
determine the optimal location of WT. The IEEE 30-bus system is used to carry out
the investigation study. The results indicate that the system stability is enhanced
in most cases with integrating wind energy into power system. The results can
provide a scope for future planning and expansion of electric power systems.
| page 79
(#279) Reliability
Worth Assessment of Distribution System with
Wind Turbine Generation
Ahmed R. Abul'Wafa1 Loai M. Qasem2, Aboul’Fotouh El’Garabl2
A.T.M. Taha1,
1
2
and
El’Shorouk Academy, Egypt
ABSTRACT
With recent advances in technology, utilities expect to see increasing amounts of
distributed generation (DG) on the distribution systems. Reliability worth is very
important in power system planning and operation. Having a DG ensures reliability
improvement and may be used to increase the reliability worth. This research paper
presents the study of a radial distribution system and the impact of placing DG in
order to increase the reliability worth. The aim is to perform and assess of size and
location a DG. The reliability improvement is measured by different reliability
indices that include SAIFI, SAIDI, CAIDI, ASAI, ASUI, EENS, AENS and ECOTS. In
addition, the impact of adding one DG to each feeder of the system, as well as the
size of DG installed is presented. The research also pretends to recall the impotence
of understanding of power system reliability from an investment view for
distribution companies in order to enhance the DG installation to costumer. The
studies performed are supported with the Power Management System software
ETAP and Power System Analysis and Engineering software NEPLAN.
| page 80
9:00 am – 11:00 am
Basel Hall
Session DS1: Distributed Generation Planning
Chairmen:
Prof. Dr. Fayek Farid
Prof. Dr. Soliman Eldebeiky
Placement and Sizing of DG and Capacitor for the
Loss Reduction in Distribution Systems using Analytical/Fuzzy
Technique
DS1: DG Planning (1/7)
(#158) Optimal
Ahmed R. Abul'Wafa
Gamal . A . Haggag
Ministry of Electricity, Egypt
ABSTRACT
This paper proposes a fuzzy expert system to identify the optimum location and an
effective generalized analytical methodology to find the corresponding optimal size for
capacitor/DG placement for minimizing the power losses in primary distribution
systems. The proposed methodology was tested and validated in three distribution test
systems with varying size and complexity. Results obtained from the proposed
methodology are compared with that in literature. Results show the higher
effectiveness and faster speed of the method. Also, DG improves loss reduction and
voltage profile much better than the capacitor and is more effective.
(#174) Distributed
Generation Allocation Using Analytical Power
Loss Expressions and Optimal Power-Flow
Karar Mahmoud, Ahmad Eid and Mamdouh Abdel-Akher
ABSTRACT
This paper presents a method for defining the optimal size and location of the
distributed generation (DG) units subject to minimum power losses of the studied
distribution networks. The proposed method is based on a combined analytical
technique and a computational method using optimization solvers. The proposed
method uses two sequential steps. Firstly, the optimal DG location is determined
based on the analytical technique. Secondly, the optimal DG size is calculated using
optimization techniques available in the widely adopted optimization AMPL package.
This method is validated and compared with the traditional techniques published in
the literature. The 33 bus and 69 bus distribution test feeders are studied. The
proposed allocation method is applied on single and multiple distribution generators.
The calculated results are compared favourably with the simulation results of NEPLAN
commercial software for both the distribution test feeders. The calculated simulation
results show that the proposed method is fast, accurate, and reliable.
| page 81
(#211) Technical,
Economical, and Environmental Evaluation for
Sizing and Siting of Distributed Generation in Electric Power
Networks
Mariam A. Sameh
Future University, Egypt
Walid El-Khattam, Mahmoud A. Mostafa, Mohamed A. L. Badr
ABSTRACT
Distributed Generations (DGs) have spread widely in electric distribution systems due
to their positive impacts on the system. One of the main benefits is using DGs as an
alternative element in electric distribution expansion planning. Thus, this paper
investigates the optimal solution of sizing and siting of DG units in electric distribution
system using the Particle Swarm Optimization (PSO) technique. It takes into
consideration minimizing the distribution network losses, improving the voltage
profile, and improving economic and environmental aspects. Two electric distribution
systems are used to evaluate the proposed PSO technique. The first system is used to
verify the proposed PSO technique by comparing the obtained results with a previously
studied Numerical technique. The second system is a practical distribution system
(Borg El-Arab substation; a part of the Egyptian National Electricity network) where the
proposed PSO technique is implemented. The obtained results are evaluated and
discussed. Finally, conclusions are reported.
(#269) Impact
of DGs on Protection Coordination and Reassessment
for its Optimum Siting and Sizing
M. F. Kotb
ABSTRACT
This paper presents the impact of preselected optimum locations and sizes of
distributed generation (DGs) on the Protection Device Coordination study (PDC) in the
distribution system. PDC has been investigated for the proposed network with and
without DGs. The best locations and sizes of DGs by different methods have previously
been identified are applied to the PDC and analysed for various scenarios. Different
expected severe fault locations are considered in the PDC for all cases to effectively
evaluate thier impacts. DGs Circuit Breaker’s overcurrent relays are considered in the
studies. The concluded results are utilized to reassess the optimal DGs allocation after
taking the PDC effect into considerations. Solutions to the raised PDC problems are
proposed. This study has been implemented on a 69-node radial distribution network
using ETAP Power Station.
| page 82
(#214) Distributed
Generators Allocation in Distribution Networks
Using Backtracking Search Optimization Algorithm
Attia El-Fergany
Zagazig University, Egypt
ABSTRACT
The article applies a very recently swarm optimization technique namely backtracking
search algorithm to allocate the distributed generators along the distribution
networks. One of the main features of the backtracking search strategy is a single
control parameter and not over sensitive to the initial value of this factor. The
objective function is adapted to minimize the network real power technical losses and
to enhance the bus voltage profile in order to improve system operating performance.
Loss sensitivity factors and bus voltages are utilized for the initial identification of
locations to reduce the search space. However, this method proves less satisfactory to
identify the optimum locations for distributed generators placement. Due to
aforementioned, the proposed approach is attuned to tackle this shortfall and to
optimally select the final placement within a pre-set search space. Two types of the
distributed generators have been studied and investigated. The combined power
factor and reduction in reactive power loss are observed and reported. The proposed
approach has been applied to many radial distribution networks with different sizes
and complexities to validate its viability. The proposed method generates high-quality
solutions securely and comparable to other methods in the literature with smooth
coveregence characteristics.
(#218) Reliability
Evaluation of Distribution Systems under Microgrid-tied and islanded Micro-grid modes Using Monte Carlo
Simulation
Ahmed R. Abul'Wafa
ABSTRACT
Reliability evaluation of distribution networks under grid-tied and islanded µgrid
modes is presented. Time sequential Monte Carlo simulation (MCS) algorithm is
applied to a modified RBTS Bus 2 distribution network. The network includes three
types of distributed energy resources, namely, solar photovoltaic (PV), wind turbine
(WT), and diesel turbine generator (DTG). These distributed generators contribute to
supply part of the load during grid-connected mode, but supply 100% of the load in the
islanded µgrid mode. A storage system is included to decrease the peak load since the
peak of the output power of the PV's and the peak load do not occur at the same time
in most load profiles. The impact of implementing renewable distributed generation,
storage systems, and conventional generation on the reliability of distribution network
is studied. This study shows that the implementation of distributed generations can
improve the reliability indices of the distribution network.
| page 83
(#247) Technical
and Economic Assessment of Allocating
Distributed Generation Resources on Electric Power System
Performance
A. S. Hassan
A. H. younes
Egyptian Electricity Holding Company, Egypt
PGESCo Company, Egypt
M. Abou El Saad, F. Bendary
ABSTRACT
The paper describes a technical and economic study, when installing one or more
distributed generation (DG) units, with the aim of reducing the total active power
loss and enhancing voltage magnitudes within DG units constraints. An IEEE 9-Bus
system is used for the study. A financial model, based on Build, Own &Operate
(BOO), is presented for budgeting the distributed generation within the electric
network including the energy cost and capacity price to calculate the expected
tariff. The method would enable operation engineers to prepare a reliable and
efficient plan to integrate DGs into their networks. The main objective of this paper
is to determine the optimal locations, optimal sizes, and identifying the financial
feasibility of DGs penetration through its internal rate of return (IRR) and assess its
profitability.
| page 84
9:00 am – 11:00 am
Zurich_1 Hall
Session PR2: Fault Detection & Line Protection
PR2: Fault Detection & Line Protection (1/7)
Chairmen:
Prof. Dr. Abdelmaksoud Taalab
Prof. Dr. Almoataz Y. Abdelaziz
(#023) Modern
Approaches for Protection of Transmission Line
Compensated With UPFC
A.M. Ibrahim, H.E. Talaat, N.M. Bastawy
ABSTRACT
Comparison of Artificial Neural Network (ANN) and Gaussian Process (GP) for
protection of transmission lines compensated with Flexible AC Transmission
Systems (FACTS) is presented in this paper. Among different FACTS devices,
Unified Power Flow Controller (UPFC) is regarded as the most generalized version
since it serves to control line impedance, voltage and phase angle at the same time.
The measured voltage and current signals are pre-processed first and then
decomposed using Discrete Wavelet Transform (DWT) to obtain the high
frequency details and low frequency approximations. The patterns formed based
on high frequency signal components are arranged as inputs of ANN and GP for
detecting and classifying different fault conditions.
(#028) Islanding
Menofia University
Detection Using Negative and Zero Sequence
Voltages
Ahmad G. Abdelkader, Dalia F.Allam, El Sayed Tag Eldin
ABSTRACT
this paper proposes a passive islanding detection method for wind turbines. The
proposed method is based on voltage measurements and processing of this voltage
to find the negative and zero sequence voltages at the point of common coupling
(PCC). The rms values of the negative and zero sequence voltages are calculated
over a running average window of one cycle of the specified fundamental
frequency then compared to threshold values to judge if there is an islanding
operation at the PCC. The proposed method is simulated and tested in various
operation conditions. Simulation results presented in this paper show that the
proposed islanding detection method succeeds in detecting islanding operation
with high confidence. The abnormal operating conditions under study are load
switching, capacitor bank switching, voltage dip, voltage swell and islanding
operation. Matlab Simulink was employed for this purpose.
| page 85
(#037) Fault
Detection Technique of High Impedance Faults in
EHV Transmission Lines Using Combined Wavelet Transform
and Prony’s Method
Saber Mohamed Saleh
Fayoum University, Egypt
ABSTRACT
High impedance faults (HIFs) are difficult to detect by conventional protection devices
such as distance and overcurrent relays. This paper presents a scheme for high
impedance fault detection in extra high voltage transmission line by recognizing the
distortion of the voltage waveforms caused by the arcs usually associated with HIFs.
The proposed scheme is based on combined wavelet transform and Prony’s method.
The discrete wavelet transform (DWT) based analysis, yields three phase voltages in
the high frequency range which are fed to a classifier for pattern recognition and also
fed to the Prony’s method for correct discriminating of switching with and without
fault cases. The classifier is based on an algorithm that uses a recursive method to sum
the absolute values of the high frequency signal generated over one cycle by shifting
one sample, while switching cases discrimination is based on Prony’s amplitude
changing with time. Characteristics of the proposed fault detection scheme are
analysed by extensive simulation studies that clearly reveal that the proposed scheme
can accurately detect HIFs in the EHV transmission lines. Results of extensive
simulations using ATP/EMTP on 500 kV Egyptian transmission line clearly reveal that
the proposed scheme can accurately detect HIFs in the EHV transmission lines systems
as well as its ability to discriminate clearly between HIFs and various switching
conditions.
(#061) External
Doaa Khalil Ibrahim
Faults Detection in Three-Phase Induction Motor
using Artificial Neural Network
Mohamed A. Tolba, Ayman A. Eisa
Atomic Energy Authority, Egypt
Ahmed A. Hassan
ABSTRACT
This paper concerns toward the digital protection of three-phase induction motors
with a simple and reliable proposed system. This system uses artificial neural network
(ANN) for monitoring and diagnosis of external faults. A mathematical dynamic model
influenced by external faults (e.g. single line to ground, unbalanced supply voltage,
over voltage and phase sequence reversal of supply voltage) is presented. The ANN is
trained based on the measurements of the motor speed and the RMS values of stator
voltages and currents fundamentals, which are obtained using Discrete Fourier
Transform (DFT). The proposed system has been simulated using “Matlab/Simulink”
Software and tested for different types of external motor faults. The simulated results
demonstrate that the proposed technique can accurately and early detect and
diagnose external faults of induction motor. Also, a complete protection for the threephase induction motor against external faults can be achieved more efficiently and at a
reduced cost.
| page 86
(#076) Detection
and Classification of Broken Rotor Bars Faults in
Induction Motor Using Adaptive Neuro-Fuzzy Inference System
Menshawy A. Mohamed
Qena Water and Wastewater Company, Egypt
E. H. Abdelhameed
M. A. Moustafa Hassan
ABSTRACT
Induction Motor (IM) plays a very important part in industrial plant. However,
various faults can be occur, such as stator short-circuits and rotor failures. This
paper presents an Adaptive Neural Fuzzy Inference System (ANFIS) based
technique to detect and classify the broken rotor bars faults in a three-phase
induction motor. This detection and classification are based on stator current signal
analysis. The effectiveness of using ANFIS technique to detect and classify the
broken rotors faults of three-phase IMs is investigated using MATLAB/SIMULINK.
Simulation results clearly illustrate that the stator current signature can be used to
diagnose faults of squirrel cage rotor by using ANFIS technique.
(#263) Wavelet
Mahmoud A. Sayed
and Fuzzy Logic Based Fault Detection in MultiTerminal HVDC Systems
Ahmed Hossam- Eldin
Ahmed Lotfy
Arab Academy for Science, Egypt
Mohammed Elgamal
Arab Petroleum Pipelines Com., Egypt
Mohammed Ebeed
Alexandria Port Authority
ABSTRACT
Multi-terminal high voltage DC (MTHVDC) being very sensitive to DC faults, require
rigid detection and fault clearing techniques capable of detecting commonly
occurring positive and negative to ground faults. In this paper, a new wavelet –
fuzzy logic based protection algorithm is developed to detect faults and identify the
polarity of the faulty pole in a multi-terminals HVDC systems. The algorithm is
applied to a multi-terminal test system. Simulation results illustrate the validity and
importance of the technique. The proposed algorithm is important to power system
planers and operators in IGBT voltage-source converter based DC networks.
| page 87
(#265) On
Line Minimization of Distance Relay Reading Errors
Due to Shunt Flexible AC Transmission Systems (FACTS)
Gaber El-Saady, Rashad M.Kamel, Essam M.Ali
ABSTRACT
This paper presents a new adaptive algorithm for long distance relaying
protection with presence of shunt FACTS devices called STATCOM. The proposed
scheme feeds the relay by its set impedance with changing the system parameters.
The relation between errors in relay reading due to shunt FACTS versus the
impedance measured values with FACTS are estimated and adapted using Curve
fitting method at different modes and locations of FACTS and fault resistances.
These errors are used to modify the relay measured impedance (V/I ratio). The
new proposed algorithm is employed and evaluated via a mathematical model of
simple power system. The results prove that the new algorithm is effective and it
has the ability to minimize the relay reading errors due to connecting shunt FACTS
device.
| page 88
9:00 am – 11:00 am
Zurich_2 Hall
Session PS6: FACTS Planning and Control
Chairmen:
Prof. Dr. Tarek A. Sharaf
Prof. Dr. Ibrahim E. Helal
Cairo University
Computation of Parameters and Placement of
FACTS for Maximum System Loadability and Minimum
Production Cost
PS6: FACTS Planning& Control (1/7)
(#026) Optimal
G.El-Saady, A. Ahmed and EL Noby
M. A. Mohammed
Upper Egypt Company for Electricity
ABSTRACT
Optimal power flow (OPF) is the major task in power system economics and operations.
Real power outputs from the power system generators are adjusted such that the total
load power is increased (maximized) and the system total real power loss is decreased
(minimized). Hence, the objectives of solving the OPF problem are controlling and
optimizing the generators output real power, generators bus voltages and transformers
tap setting. Moreover, it is desired to reduce or eliminate the lines overloading and
violation of the bus voltages from their specified values. Therefore, design of FACTS
devices and choosing their locations for multi control operation to minimize the total
production cost are the keys to achieve the above-mentioned objectives. This work was
done by considering Particle Swarm Optimization (PSO) algorithm for optimally
selecting the parameters of the different used control variables. The proposed
algorithm is simple, with less number of parameters and easy to implement. The
performance of this algorithm in OPF is tested using IEEE-30 bus test system. Numerical
results show that the proposed algorithm outperforms the other recently developed
algorithms.
(#035) Optimal
Location of FACTS Devices to Reduce Wind
Variation Effect on Power System
M. A. Attia, A. Y. Abdelaziz, M. A. El-Sharkawy
ABSTRACT
Wind generation connection to power system affects steady state and transient
stability. Furthermore, this effect increases with the increase of wind penetration in
generation capacity. In this paper optimal location of FACTS devices is carried out to
solve the steady state problems of wind penetration. Case study is carried out on
modified IEEE-39 bus system one with wind reduction to 20% in system suffer from
outage of one generator with load at bus 39 decreases from 1104 MW to 900 MW. The
system suffers from min voltage reduction, total loss increases and violated of power
and power angle limits. This paper found that series FACTS devices in certain range are
the best type to solve these problems associated with wind penetration in power
systems.
| page 89
(#031) Optimal
Power Flow of Power System Incorporating FACTS
Based on PSO Algorithm
G. A. Morsy and R. A. Amer
Ekramy Saad
Egyptian Electricity Transmission Co.
ABSTRACT
This paper presents an efficient and reliable evolutionary-based approach to solve the
optimal power flow (OPF) problem. To search the optimal setting of control variables
for the OPF, which is formulated as a nonlinear constrained objective optimization
problem with both equality and inequality constraints, particle swarm optimization
(PSO) algorithm is used. The standard IEEE 57-bus test power system is studied to
illustrate how the proposed method has an efficient role. The objectives are
minimizing the total fuel cost, system power loss, investment cost of FACTS and
voltage deviation. Two different types of FACTS devices are incorporated with the test
system, SVC and UPFC, to achieve the objective functions under certain constraints.
Furthermore, the proposed method is used to determine the optimal location of FACTS
controller. The results show the effectiveness of UPFC with optimal settings over the
SVC under the same conditions. Also, the results illustrate the importance of
determination of the best location of FACTS devices.
Choice and Allocation of FACTS Devices for
Security-Constrained Economic Dispatch
(#038) Optimal
G.El-Saady, El-Nobi A.Ibrahim, Mohamed A.Hendy
ABSTRACT
Flexible AC transmission systems (FACTS) devices have provided new control facilities
in power systems. Simultaneous optimization of type, location, number and
parameters for FACTS devices is an important issue when FACTS devices are applied to
the power system with the purpose of increasing system loadability. This paper
presents the application of simulated annealing algorism (SA) to find optimal type,
number, location and parameters of FACTS devices to achieve security-constrained
economic dispatch (SCED). The overall cost function, which includes generation cost
and installation cost of FACTS devices, should be minimized. The SCED constraints are
generators, transmission lines and FACTS limits. Two types of FACTS devices are utilized
in this study namely STATCOM as a shunt type and TCSC as a series type. In this study
simulations were performed on IEEE 14-bus. Results of simulations are encouraging
and could efficiently be employed for power system operations.
| page 90
(#090) Multi
Objective Control of UPFC using IP Controllers
Mahmoud A. Sayed
Upper Egypt Co. for Electricity, Egypt
ABSTRACT
Application of UPFC for simultaneously active and reactive power flow control, voltage
support, DC link voltage regulation and also damping of Low Frequency Oscillations (LFO) is
introduced. Proposed Integral-Proportional IP controllers are implemented to control the
UPFC. The Parameters of IP controllers are determined and tuned using Phase Angle Particle
Swarm Optimization (θ-PSO) method. A single-machine infinite-Bus (SMIB) power system
with UPFC controlled by θ-PSO tuned IP controller is simulated. Moreover, a comparison
between the conventional PI controller and Proposed IP is studied and obtained. The digital
simulation results visibly show the validity of IP controllers over PI controllers.
(#123) New
Findings on Particle Swarm Intelligence for The
Solution of The Capacitor Allocation Problem
S. F. Mekhamer, R.H.Shehata, M. A. L. Badr
ABSTRACT
Many nature inspired meta-heuristic algorithms have been attempted for reactive power
compensation of radial distribution feeders. In this paper, we introduce and implement a
novel accelerated particle swarm optimization technique. Results of the proposed
approach are compared with previous methods to show the superiority of the proposed
method using three actual distribution feeders (of 9 bus, 15 bus, and 69 bus feeders). This
new simple technique has the ability to give the best results for maximum reduction in
system losses and costs among all previous studied techniques.
(#251) TCSC
Devices for N-1 Security-Constrained Economic
Dispatch
G. El-Saady, El-Nobi A.Ibrahim, Mohamed A.Hendy
ABSTRACT
Flexible AC transmission System (FACTS) devices, such as, thyristor controlled series
compensators (TCSC) may be used to enhance system performance by controlling the power
flows in the network. It is important to optimize the number of TCSCs and to locate optimally
these devices in the power system because of their costs. This paper presents the
application of simulated annealing algorism (SA) to find optimal number, location and
parameters of TCSC devices to achieve N-1 security-constrained economic dispatch (N-1
SCED). The overall cost function, which includes generation cost and installation cost of TCSC
devices, should be minimized. System N-1 security constraints have been incorporated using
linear sensitivities, such as Power Transfer Distribution Factors (PTDFs) and Line Outage
Distribution Factors (LODFs). Also the effect of TCSC installation at different consumption
(load) levels is studied. In this study simulations are performed on IEEE 14-bus system.
Simulation results are encouraged to be employed for power system operations and
planning.
| page 91
11:30 am – 13:30 pm
Bern Hall
Session RE3: Hybrid Renewable Energy Systems
RE3: Hybrid Renewable Energy Systems (1/7)
Chairmen:
Prof. Dr. Zeinab H. Othman
Prof. Dr. Adel Abu-Elela
Cairo University
Menofia University
(#103) A Comparison between Emergency Photovoltaic System and
Emergency Diesel Generator System Performances Based on ABC
Algorithm
Ahmed Fathy,Mahdi M. El-Arini, and Ahmed M. Othman
University of Zagazig, Egypt
ABSTRACT
Due to the dangerous amount of harmful gases emitted from the diesel generator system, it
is advisable to find an alternative clean source which is the Photovoltaic (PV) system. This
paper compares between the performances of the PV system and the diesel generator when
they are used as emergency units. The emergency unit is used to supply a vital load when the
main grid is failed. The proposed vital load consists of a capacitive load and induction motor.
An Artificial Bee Colony (ABC) optimization algorithm is applied for optimal sizing of the
proposed PV system based on minimization of the system Life Cycle Cost (LCC). The results
show that the utilization of the proposed emergency PV system will save 18.3942%
compared to the utilization of the emergency diesel generator. Therefore the emergency PV
system is more economic than the emergency diesel one.
(#107) Design, Implementation and Validation for a Hybrid
Photovoltaic /Thermal Tracking System
Magdy M.Abdelhameed, and M.A.Abdelaziz
A.Bayoumi
ABSTRACT
In this paper a comparison between numerical model and experimental work results for a
tracking Photovoltaic/ Thermal (PV/T) hybrid system is presented. The simulation in this
work is based on a numerical model in solving the equations and determining the
Photovoltaic (PV) cells characteristics using both MATLAB and COMSOL Multiphysics.
COMSOL is simulating the electromagnetic waves produced by the Sun through solving
Maxwell's equations in three dimensions using Finite Elements Methods (FEM) and the sun
irradiance is assumed to be Gaussian distribution across the twelve mourning hours. Beside
that an experimental work is presented depending on the results conjured from the
theoretical experience used in Comsol Multiphysics. In addition to the above a thermal
analysis for the tracking PV modules and the piping water is presented where the input,
output temperatures, rate of heat transfer, overall heat transfer coefficient and thermal
efficiency are calculated. As a result, a significant enhancement in the total electrical
efficiency is observed with acceptable increase in the output water temperature.
| page 92
(#110) Back Pipes Optimization in a Photovoltaic/Thermal Hybrid
System Using Finite Element Method
A. Bayoumi, I. M. Mahmoud, and S. O. Abdellatif
ABSTRACT
This paper presents a new approach in modelling a photovoltaic/thermal hybrid system
based on Finite Element Method (FEM). Comsol Multiphysics, a commercial simulator
based on FEM, and MATLAB simulation tools are used to implement this electro-thermal
model. An optimization process takes place for the back pipes regarding its material, Shape
and pipe diameter for maximum conversion efficiency and rate of heat transfer. In addition
to that current-voltage and power-voltage characteristic curves are plotted and the device
electrical parameters (open circuit voltage, short circuit current, fill factor) are calculated
for different topologies. The thermal analysis takes place through studying the heat
transfer effect and plotting the input/output temperature variation for different
configurations. Finally the rate of heat transfer is calculated and plotted showing the
leading of one structure over the others.
(#162) Impact of Intermittent Wind and Photovoltaic Power on the
German System
Ibrahim A. Nassar
Harald Weber
Al-Azhar University, Egypt
Rostock University,Germany
ABSTRACT
In Germany due to the continuous high expansion of the intermittent power production
capabilities of wind turbines and photovoltaic systems, the operational modes of thermal
generation units will be influenced essentially until 2020 and beyond. The integration of
this increasing share of intermitting generation while maintaining the present security level
of supply confronts the existing power system with a big challenge. The fundamental
problems are that the intermitting generation does not necessarily fit the power demand
and is often located far away from the load centers. This results in physical limitations for
integration of intermitting generation with regard to the existing infrastructure. Therefore
it is has to be lined out that the acceleration time constant is reduced if conventional
power plant generators with masses are disconnected and replaced by the intermittent
generators while the total nominal power value of the whole system remains constant. On
the other hand more immediate acting acceleration power produced by the turbinegenerator-systems of the conventional power plants will disappear because of shut down
of these plants and related loss of inertia. With the reduction of inertia not only the
frequency deviation after disturbances will increase substantially but also with more
oscillation occurs and causes reduction of system stability. Therefore, different methods
and tools to simulate the power plant scheduling will be presented and illustrated under
different scenarios of RES to check whether the system is stable or unstable.
| page 93
(#188) A Particle Swarm Optimization Based Approach for Optimal
Sizing of Stand-alone Hybrid Renewable Energy Systems
Ahmed Hassan, Magdi El-Saadawi, and Mohammed Saeed
ABSTRACT
As a cost-effective and reliable alternative to supply remote areas, stand-alone hybrid
renewable energy systems (HRES) are recently under investigation to address various
concerns associated with technical, financial and environmental issues. This paper presents a
methodology for optimal sizing of a stand-alone hybrid wind/photovoltaic (PV)/battery
system. Three hybrid renewable energy power systems are presented to select the most
optimum combination of them. These proposed systems are stand-alone PV-wind-battery
hybrid system, stand-alone wind-battery system, and stand-alone PV-battery system. This
paper utilizes the Particle Swarm Optimization (PSO) technique for optimal sizing of standalone HRES under different economic and operational conditions. A Matlab-PSO code is
developed and implemented to solve the optimization problem to minimize the total
equipment cost. In addition, a comparison between the three proposed systems is illustrated.
The obtained results prove the suitability of applying PSO technique for solving the
optimization problem of sizing stand-alone hybrid renewable energy systems.
(#210) Small-Scale Wind/PV Grid Connected Hybrid Renewable Energy
System Optimization
Ahmed R. Abul'Wafa
ABSTRACT
This paper presents an optimization model to design a grid connected hybrid renewable
energy systems consisting of wind turbines, photovoltaic modules, controllers and inverters.
This model requires a data bank where detailed specifications and cost of the equipment must
be available. It must also include the wind speed and solar radiation data for the desired sites.
The grid connected hybrid system sizing optimization is formulated as integer linear
programming problem with linear constraints. This optimization problem is solved using
GLPKMEX, a Matlab MEX interface for the GLPK library. Using the optimization model with the
data bank, the optimal configuration of equipment required for the project to supply energy
demand at the lowest possible cost is determined. An economic analysis is performed to
calculate the net present value of the project over a period of 20 years. The optimization
procedure is applied to residential loads at three different sites in Egypt. The results show that
renewable energy projects are a good investment for sites, where wind and solar irradiation
are abundant, the system is cost effective.
| page 94
(#264) A Cost Comparison between Fuel Cell, Hybrid and
Conventional Vehicles
Ahmed Elnozahy, Ali K. Abdel Rahman and Ahmed Hamza H. Ali
Egypt-Japan University of Science and Technology, Egypt
Mazen Abdel-Salam
ABSTRACT
The objective of this paper is to present an assessment of cost for a fuel cell hydrogen
vehicle (FCV) driven by a brushless DC motor (BLDC). A two leg directly coupled interleaved
boost converter is used to power the motor from the fuel cell through a three-phase
inverter. The power rating of vehicle motor is calculated and subsequently the rating of the
fuel cell is determined. The cost of vehicle components including fuel cell stack, boost
converter, brushless DC motor and hydrogen tank is estimated. The cost of FCV, the
refueling cost, the market price and the efficiency of FCV are compared with those for
internal combustion engine (ICE) and hybrid electric vehicle (HEV). CO2 emission from the
conventional ICE and HEV vehicles as well as the CO2 tax are compared with the proposed
zero-emission FCV.
| page 95
11:30 am – 13:30 pm
Basel Hall
Session DS2: Analysis of Distribution System
Chairmen:
Prof. Dr. Mahdy El-Arini
Prof. Dr. Mahmoud A. Mostafa
Zagazig University
DS2: Analysis of Distribution System (1/7)
(#027) Multiple voltage controlled distributed energy resources
sizing and allocation for virtual power plant realization
M.M.Othman , W. El-Khattam and A.Y.Abdelaziz
Y.G.Hegazy
German Univ. in cairo
ABSTRACT
Distributed energy resources have been gaining increasing importance in the last few
decades due to economical and technical reasons. However, continuing integration of
more distributed generator units into the grid without amity between them will lead to
operational problems. In order to control the mounting penetration of distributed
energy resources, the virtual power plant concept is becoming increasingly attractive.
The proposed work aims to select the best size and location of one or more distributed
energy resource for power loss minimization. This paper develops an unbalanced power
flow based on backward/forward sweep method. The proposed algorithm can handle
multiple distributed generators with the ability to switch their model. The proposed
algorithm is implemented in MATLAB and tested on the IEEE 37-nodes feeder. System
studies are done for selecting the proper location and capacity for one or two
distributed generators by varying the distributed generators penetration taking the
system constraints into consideration.
(#173) Effect of Different Modelling of Distributed Generations on
the Voltage Stability of Unbalanced Distribution System
Ahmed Bedawy
Mamdouh Abdel-Akher, and Mohamed M. Aly
South valley University, Egypt
ABSTRACT
This paper studies the effect of different types and models of distributed generators
(DGs) on the voltage stability and voltage profile of the unbalanced distribution
systems. Different models of photovoltaic (PV) and wind Energy generation systems
(WEGSs) are incorporated in the developed three-phase continuation power flow
program. The PV interface inverter was assumed to generate reactive power to support
voltage in in distribution system. Maximum loading point (MLP) was calculated at
different ratings and models of DGs to detect the impact of the DGs on system voltage
stability limit.10-bus radial distribution system was used as the study system. It is found
that the different types and models of DGs have different effects on the voltage
stability limit and voltage profile of the distribution system.
| page 96
(#098) Data Structured Load Flow Analysis of Radial Distribution
Systems with Distributed Generations
Ahmed R. Abul'Wafa
ABSTRACT
This paper develops a load flow method for radial distribution systems (RDSs) with
distributed generations (DG) that is fast to compute and flexible to RDS reconfiguration.
Owing to the radial nature and high R/X ratio, RDSs employ a special recursive technique
for distribution load flow (DLF). An efficient method for DLF plays a critical role in
automation algorithms of RDS whose scope encompasses fault isolation, network
reconfiguration and service restoration. The ability of automation algorithms to handle
these complex tasks that require frequent topology changes in the RDS demands a
dynamic topology processor based on a well-defined data structure. The purpose of this
paper is to formulate a dynamic data structure (DDS) and an algorithm that generates the
DDS of the RDS as an R-tree. The proposed DDS algorithm, in a MATLAB® programming
environment generates the DDS and is used as a topology processor in the DLF algorithm. It
avoids the use of unique lateral node and branch numbering process that is otherwise
required. The resulting DLF algorithm for RDSs with DG is computationally efficient and can
handle rapidly changing topology by updating the R-tree. Various RDSs have been tested
with the proposed method and the results demonstrate its efficiency. The paper
encompasses results on 33 bus system with DG only due publication size limitation rules.
The actual code for the resultant load flow program was written using the MATLAB®
programming language.
(#243) Decentralized Reactive Power Control in Active Distribution
Networks
T. M. Sobhy1, N. G. A. Hemdan1,2, M. M. Hamada1, and M. A. A.Wahab1
1
2
Teschnische Universität Braunschweig, Germany
ABSTRACT
This paper introduces a new voltage/reactive power control strategy in active distribution
network. The suggested control strategy is based on the Distributed Generation (DG) active
power and voltage at the Point of Common Connection (PCC). A comparison between the
results of the proposed strategy and standard strategies was presented. The proposed
methodology was implemented on real rural Medium Voltage (MV) grid. Measured
generation profiles of the renewable energy based DG units were used for three weeks
representing different seasons. Loads profiles of households are also used through the
simulation the analysis was conducted using PowerFactory DIgSILENT software.
| page 97
(#140) A developed Control Strategy of Plug-In Hybrid Electric
Vehicles Charging/Discharging with Voltage Stability Improvement
of Distribution Systems
Mamdouh Abdel-Akher, and Ahmad Eid
Abdel-Fatah Ali
ABSTRACT
As the number of plug-in hybrid electric vehicles (PHEVs) is expected to increase rabidly in the next
years, their impacts could lead to severe problems for distribution systems such as degrading of
voltage profile, stability and increase of system losses. In this paper, a new technique is developed
for charging and discharging the batteries of PHEVs in real time. The objective of the developed
control strategy is to keep the system in secure operation irrespective of the number of vehicles
and their connection place along the distribution feeder. The strategy adopts the steady state
voltage stability index that is easy to compute using the smart-grid load flow program
implemented in the distribution management systems. A fuzzy logic controller is used for
evaluating the battery level of charging or discharging for each vehicle connected to the system.
The controller will be a part of the smart charger and uses both of the battery state of charge and
stability index as input variables. Based on the controller output, the interface converter of each
PHEV decides the desired level of charging or discharging. This ensures secure operation of
distribution systems during charging whereas empty batteries have priority for charging. A time
series simulation for a period of 24-hour with a set of daily load curves with PHEVs loading are
used to test the proposed control method. The results show the developed control method
guarantee secure operation whatever the number of vehicles connected to the distribution
system.
(#213) Network-Topology-Based Load Flow Solution For Weakly
Meshed Distribution Networks
Ahmed R. Abul'Wafa
ABSTRACT
A load flow solution technique is proposed for the analysis of weakly meshed distribution systems. A
branch-injection to branch-current BIBC matrix is formed through the directed graph of a radial
network represented by a nodes-by-nodes sparse matrix. Traversing the directed graph in depthfirst search form the power flow paths (downstream nodes for each node including the node itself)
are detected. A BN connection matrix is constructed based on the discovered paths. The lengths of
the discovered paths explore the number of downstream nodes from each node including the node
itself. BIBC is built by assigning unity to the nodes of the discovered paths. For the weakly meshed
distribution network BIBC is modified through the line injection to loop current LILC matrix. The
branch-current to bus voltage BCBV matrix is calculated from element primitive impedances and
connection matrix BN. No modification of BCBV is needed for meshed network. The proposed
method is tested on various standard IEEE test systems in a configuration of weakly meshed
distribution system.
| page 98
(#255) Lagrange Quadratic Polynomial Predictors for Unbalanced
Distribution Systems’ Voltage Profile Analysis
A. Selim1 , M. Abdel-Akher2, M. M. Aly1, and M. A. Abdel-Warth1
1
2
Qassim University, KSA
ABSTRACT
This paper presents a new method for solving continuous load flow in unbalanced radial
distribution power systems. In the proposed method, the increment in time series is
replaced by the change of the active and reactive powers of the daily load curve. A
comparison between this method and the traditional method; the time series increment
is presented. . In the proposed method, the change in the active and reactive powers
were used to determine the predicted phase angles and voltage magnitudes. The authors
called this method the (P-Q) technique. However the traditional technique uses the
change in time to predict the voltage magnitudes and phase angles. The authors called
this method the (Time) technique. The Lagrange linear and quadratic interpolations have
been applied with both techniques and, the forward/backward sweep was used to
calculate the load flow of unbalanced three-phase system. The main advantage of the
forward/backward method is avoiding the construction of massive augmented threephase Jacobian matrix of the classical Newton-Raphson method. The result show that
using the Lagrange linear and quadratic interpolations techniques are proved to improve
the overall solution process in reducing the number of iterations and time of calculations
compared with the technique of using the previous value as a predicted solution. The
calculated results using the developed method were adopted for radial unbalanced IEEE
123-node feeder. The calculations were performed using C++ programing.
| page 99
11:30 am – 13:30 pm
Zurich_1 Hall
Session PR3: Adaptive Protection
Chairmen:
Prof. Dr. Ahdab M. Elmorshedy
Prof. Dr. Elsayed A. Mohamed
Cairo University
PR3: Adaptive Protection (1/7)
(#008) Smart Current Differential Protection for Transmission Lines
Khaled Abdel Wahab
Hossam E.A. Talaat, Amr Ibrahim
Egyptian Electricity Transmission Comp.
ABSTRACT
This paper proposes a smart current differential protection scheme for transmission lines
by proposing a methodology to control of the restraining region in a current differential
plane. An error analysis of conventional phasor approach for current differential
protection is provided using the concept of dynamic phasor; the scheme uses global
positioning system (GPS), while fiber optics is preferred for communication. The
proposed technique is evaluated using PSCAD / EMTDC program on typical 220 kV
transmission line. Simulation studies show that this protection scheme is very secure,
reliable and selective and it is more sensitive and faster than other conventional current
differential protection schemes.
(#010) Out of Step Detection Based on Phasor Measurement Units
and Parallel Algorithms for Multi-Machine System
R3: Adaptive Protection (2/7)
Almoataz Y. Abdelaziz, Amr M. Ibrahim, Zeinab G. Hassan
ABSTRACT
This paper presents an approach to design power system transient stability assessment
using direct methods for a multi-machine system that uses measured values of the
currents and voltages of the three phases of two buses (equivalent to Phasor
Measurement Unit data). The multi-machine system is reduced to groups denoted Single
Machine to Equivalent Bus models and another groups denoted Load Equivalent Bus
using Parallel Algorithms . The measured data is transformed from time domain into
phasor domain using Discrete Fourier Transform to predict whether the power swing is a
stable or an unstable one. The performance of the method has been tested on a
simulated multi-machine system using PSCAD and MATLAB software. The proposed
scheme can be used for the detection of out of step condition using an extension of the
equal-area criterion.
| page 100
(#012) Adaptive Stability Detection Algorithm For Modern
Protection Relays
Mohamed A. Ali, Wagdy M. Mansour
ABSTRACT
This paper presents an adaptive relay algorithm for Out-Of-Stability (OOS) detection
that can be implemented in modern distance, line differential, and generator protection
relays. The algorithm based Synchro-Phasor Measurement Units (SPMUs) for detecting
the online system frequency used for calculating the online system angular speed. The
algorithm is angular frequency-based for detecting the OOS condition for instant of
tripping and normal power swing that could be used for blocking the distance function
from the abnormal tripping. Also, the algorithm is considered a remote breakers
monitoring as it can detect fault clearing instant without any tele-communications
between local and remote end substations. Single machine infinite bus (SMIB) test
system is employed for validating the effectiveness of the proposed relay algorithm by
making a comparative analysis between the Conventional Time Domain Method
(CTDM) and the proposed relay algorithm.
(#013) Modern Protection Relays Equipped With Pmus For Out Of
Stability
Mohamed A. Ali, Wagdy M. Mansour
ABSTRACT
This paper proposes a new inter area angle stability prediction algorithm. This
algorithm does not require any prior knowledge of system state as it operates directly
from measurements drawn from SPMUs. The proposed predictor foresees the system
stability state before elapsing the first swing i.e. assessing system stability in advance.
Applying the Synchronized Phasor Measurement Units (SPMUs) for the power systems,
inter-area stability can be predicted in a proper time. Since the need for real-time OutOf-Stability (OOS) algorithms becomes a very important issue in the modern power
system networks. So that, the objective of this paper is producing an algorithm for Fast
Stability Detection (FSD) before elapsing the first swing period using enhanced equal
area criteria in time domain. For the above objective a comprehensive analysis with
various faults are performed in a single machine infinite bus test system.
| page 101
(#025) Improving Distance Protection for Out-of-step Detection
and Fault Detection during Power Swings
Doaa K. Ibrahim, Essam E. Abo El-Zahab
Mohamed E. Mohamed
Egyptian El. Transmission Co.
ABSTRACT
To ensure high reliability of the power system, distance relays are blocked during
power swings. However, if a fault occurs during a power swing, it should be detected
and the unblocking function should be invoked to clear the fault as soon as possible.
Distinguishing stable and unstable power swing is one of the challenging tasks for
distance relays. This paper proposes a combined scheme for detecting faults
occurrence during power swings and accurate determination of power swing stability
status. The proposed scheme utilizes a differential power-based technique and a
negative sequence current based technique for detecting faults occurrence during
power swings. Moreover a wavelet based power angle criteria based algorithm is
applied for distinguishing stable and unstable power swings. The proposed scheme is
extensively tested for symmetrical and unsymmetrical faults during slow and fast
power swings for simulated tested power systems using ATP software.
(#124) Protective Devices Optimal Placement in Distribution
Networks with DGs: Risk-Based Analysis and Solution
H. E.A. Talaat, S. F. Mekhamer, K. Abdel-Aty
A. A. Abuzaid
North Cairo El. Distribution Co.
ABSTRACT
Distributed power generation (DG) has drawn attention of researches in developing
new techniques for distribution network protection schemes. In this paper, a new
proposed protection scheme is presented. This scheme depends on dividing the
distribution network into zones and a computer-based relay which is installed in subtransmission controls these zones. Risk analysis is used to optimize the number and
the locations of circuit breakers on the distribution feeders by genetic algorithms to
form these zones. This method has been implemented on a typical Egyptian real
distribution network and its results have been presented. The main goal of this
paper is to present the Genetic Algorithms as a powerful tool in solving the
protective devices optimal placement in distribution networks with DGs based on risk
analysis.
| page 102
(#250) Risk Based Protective Devices Optimal Placement in
Distribution Networks with DGs: A Cuckoo Search-Based
Approach
S. F. Mekhamer, H. E. A. Talaat, K. Abdel-Aty
A. A. Abuzaid
North Cairo El. Distribution Co.
ABSTRACT
Distributed power generation causes extensive researches in modifying distribution
network protection schemes. In this paper, a new proposed protection scheme dividing
the distribution network into zones has been carried out and a computer-based relay
which is installed in sub-transmission controls these zones. Risk analysis is used to
optimize the number and the locations of circuit breakers on the distribution feeders
with using two metaheuristic algorithms; Genetic Algorithm (GA) and Cuckoo Search
(CS). These algorithms have been implemented on a typical Egyptian real distribution
network and their results have been presented. The main goal of this paper is to show
the superiority of Cuckoo Search, a very novel metaheuristic Technique, via comparing it
with Genetic Algorithm. Both techniques have been used for the solution of the optimal
placement of risk based protective devices in distribution networks including DGs.
| page 103
11:30 am – 13:30 pm
Zurich_2 Hall
Session PS7: FACTS& Stability Enhancement
Chairmen:
Prof. Dr. Mohamed I. Elsaid
Prof. Dr. Metwally A. El-Sharkawy
Mansoura University
of Power Systems Oscillations using FACTS Power
Oscillation Damper– Design and Performance Analysis
PS7: FACTS& Stability Enhancement (2/7)
(#015) Damping
M. Mandour, F. Bendary and W.M. Mansour
M. EL-Shimy
Ain Shams University,
Egypt
ABSTRACT
FACTS devices employ high speed, and high power semi-conductor technologies to help
better regulate the power systems. To improve the damping of oscillations in power
systems, supplementary control laws can be applied to the existing FACTS devices. These
supplementary actions are referred to as power oscillation damping (POD) control. In this
paper, the POD controllers are designed using the frequency response and residue
methods. The small signal stability of power systems as affected by TCSC devices and
PODs are evaluated and compared with the base power system where no FACTS devices
are included. Both modal analysis and time domain simulations are presented to show the
impact of the designed PODs on damping the electromechanical oscillations in power
systems. Several examples are given to show the impact of POD input signals on the
design and system response. The results show the capability of well designed FACTS-POD
in improving the stability of power systems. In addition, the design is successfully
implemented using the considered methods.
(#094) Optimal
Capacitor Placement for Enhancing Voltage Stability
in Distribution Systems
Ahmed R. Abul'Wafa, A.T.M. Taha
ABSTRACT
Voltage instability in power systems is characterised by a monotonic voltage drop, which
is slow at first and becomes abrupt after some time; and occurs when the system is
unable to meet the increasing power demand. The operating conditions of the present
day distribution systems are closer to the voltage stability boundaries due to the ever
increasing load demand. Capacitors are used in distribution systems to minimize line
losses and improve the voltage profile. A new algorithm for optimal locations and sizing of
static and/or switched shunt capacitors, with a view to enhance voltage stability is
presented in this paper. The superiority of this approach is demonstrated by testing the
algorithm on 33-node distribution system.
| page 104
(#101) A
Novel Multistage Fuzzy Controller for FACTS
Stabilization Scheme for SMIB AC System
Abdel-Fattah Attia
Adel M. Sharaf
Kafrelsheikh University, Egypt
Sharaf Energy Systems, Inc.
ABSTRACT
The paper presents a novel Hybrid-FACTS Based Stabilization Scheme controlled by a
hierarchical two-stage fuzzy logic (HFLC)-multi loop dynamic error driven controller.
The proposed scheme includes separate Fuzzy control stages for the PD and PID parts
to ensure robust and effective dynamic speed control and efficient energy utilization.
The PD fuzzy stage used the global error and change of error as the fuzzy input
variables. The second stage is the PID-FLC regulation which utilizes the output of the
PD-FLC stage and the integral of the global error as input fuzzy variables. The
simulation results validate the proposed control scheme effectiveness and
robustness with efficient energy utilization, improved power quality and power factor
at the Common AC Bus and load bus. A Digital simulation model of the proposed
system is developed in Matlab/Simulink/Simpower Software Environment using
operational dynamic blocks available in Simulink library.
(#157) Improving
Voltage Stability of Wind Farms Connected to
Weak Grids Using FACTS
E. E. Abou El-Zahab
ABSTRACT
Wind energy has become one of the subjects of much recent research and
development all over the world. Interconnection of wind farms into power grids,
especially weak grids, brings voltage stability problems during grid-side disturbances.
This paper studies the voltage stability of a large doubly-fed induction generator based
wind farm, connected to a modified IEEE 14 bus network during system disturbances
such as load change, three-phase fault, or voltage swell/sag. Flexible AC transmission
system devices (FACTS), such as static Var compensator (SVC) and static synchronous
compensator (STATCOM), are installed along with wind farms to maintain voltage and
frequency within grid codes. MATLAB/SIMULINK and the Power System Analysis
Toolbox (PSAT) package are used for the simulation.
| page 105
(#172) Effect
of Different Load Types on Voltage Stability in
Distribution Networks
Fatma E. Ahmed Khater, Ali H. Kasem Alaboudy and Hossam E. Mostafa
Attia
Faculty of Industrial Education, Suez University, Suez, Egypt
ABSTRACT
Distribution systems become more complex and heavily loaded and thus results in
voltage stability problems. This problem is one of the most important issues in
distribution power system analysis. In this paper, three indices (L, Lp and Lv) are
presented to assess steady state voltage stability. These voltage stability indices are
investigated under different load types, RLC and constant P&Q loads. Further, two
system reduction techniques, Thevenin impedance and loss based methods, are
considered. Voltage stability indices are examined on the IEEE 33-bus radial system.
The system under study along with different load models is simulated in MATLAB
Simulink/Coding environment. It has been found that RLC loads gives better voltage
stability indices and allows more power handling compared with constant power
loads.
(#206) Modeling
and Simulation of Integrated SVC and EAF
using MATLAB & ETAP
Ahmed M. Hassan
Tarek El-Shennawy
Al-Ezz Dekheila Steel Co.
Alexandria National Refining &Petrochemicals Co.
Amr Abou-Ghazala
ABSTRACT
Electric Arc furnace (EAF) represents one of the most intensive and disturbing loads
in the electric power system. Utilities are concerned about the effects such load can
cause and try to take precautions to minimize these effects. Therefore, an accurate
model of an arc furnace is needed to test and verify proposed solutions of
mitigation. One of the most important solutions for the voltage fluctuations
mitigation is the Static Var Compensator (SVC). This study presents the results where
arc furnace is modeled using both chaotic and deterministic elements. Voltage
fluctuations are captured using the well-studied circuit whereas a dynamic model in
the form of differential equation is used for the electric arc. A more accurate
simulation of developed model is done in Sim-Power-System environment of the
MATLAB 7.12 Version and Electromagnetic Transient Analysis Program (ETAP) for
Main Receiving Substation (MRSS) of EZDK.
| page 106
Stability Improvement of Multi-Machine Power
System Using UPFC Tuned-Based Phase Angle Particle Swarm
Optimization
(#221) Transient
M. A. Mohammed
Upper Egypt Company for Electricity, Sohag
ABSTRACT
Unified Power Flow Controller (UPFC) is one of the most viable and important FACTS
devises. Application of UPFC in single machine and multi machine electric power
systems has been investigated with different purposes such as power transfer
capability, damping of Low Frequency Oscillations (LFO), voltage support, transient
stability and so forth. But, an important issue in UPFC applications is to find optimal
parameters and location of UPFC controllers. This paper presents the application of
UPFC to enhance transient stability of a multi-machine electric power system. A
supplementary stabilizer based on UPFC (like power system stabilizer) is designed to
reach the defined purpose. An intelligence optimization method based on Phase
Angle Particle Swarm Optimization (θ-PSO) is considered for tuning the parameters
and location of UPFC based minimization of New Voltage Stability Index (NVSI) and
so parameters of the supplementary stabilizer. Several nonlinear time-domain
simulations tests visibly show the ability of UPFC in damping of power system
oscillations and consequently transient stability enhancement. The effectiveness of
the proposed method is analyzed with IEEE 14-bus test system.
| page 107

6 - mepcon

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