Overview of India Preparations for Interconnections with Bangladesh

Overview of India Preparations for
Interconnections with Bangladesh & Sri Lanka
Overview of India Preparations for
Interconnections with Bangladesh & Sri
Lanka
M.R. Chauhan/ V.S. BHAL
POWERGRID INDIA
Outline…….
India – Bangladesh Interconnector
– Context/Background
– Scope of work
– Major Milestones
– Salient Features of HVDC system
M.R. Chauhan/ V.S. BHAL
POWERGRID INDIA
1x500 MW HVDC BTB India-Bangladesh
Interconnecter Project
IN T E R C O N N E C T IO N B E T W E E N IN D IA A N D B A N G LA D E S H G R ID S
B A R A P U K U R IA
JA Y P U R H A T
M A LD A
K H E JU R IA
K A H A LG A O N
BOGRA
FARRAKA
NAOGAON
CH. NAW ABGANJ
BOGRA
SOUTH
N IA M A T P U R
B A N G LA D E S H
D H U LIA N
R A JS H A H I
NATORE
S IR A JG A N J
S A G A R D IG H I
BAHARAMPUR
IS H U R D I
DURGAPUR
GOKARNA
BAHARAMPUR
(400 K V )
4 0 0 kV D /c
IN D IA
K O LA G H A T
SUBHASGRAM
JE E R A T
S H A H JA D
PUR
BAGHABARI
GHORASAL
BHERAMARA
B O T T A IL
KATW A BAKRESHW AR
PABNA
M ADHOPUR
RAGHUNATHGANJ
K H U LN A
(S O U T H )
M.R. Chauhan/ V.S. BHAL
POWERGRID INDIA
F A R ID P U R
LE G E N D
T H E P R O JE C T
400 kV
230 kV
132 kV
E xisting
U nder C onstr. / F uture
Context/Background:
The interconnection of Electrical Grids between the India
and Bangladesh was discussed during the visit of Indian
delegation to Bangladesh from 22nd Nov. to 26th Nov.,
2009.
Various options for the interconnection were explored and
keeping in view –
•The Technical & Operational Aspects
•Economical considerations
M.R. Chauhan/ V.S. BHAL
POWERGRID INDIA
Scope of Work for the interconnector project
Indian Portion
• Transmission Line
 Baharampur(India) – Bheramara(Bangladesh) 400kV Double Circuit line
(Indian Portion) : App 85 Kms (Twin ACSR Moose Conductor)
 Loop-in and loop-out of Farakka-Jeerat 400kV Single Circuit line
at Baharampur(India) : 3 Kms
M.R. Chauhan/ V.S. BHAL
POWERGRID INDIA
Scope of Work for the interconnector project
Indian Portion
• Sub-station
 Establishment of 400kV switching-station at Baharampur(India)
• 2 Nos of 400 kV line bays for loop-in and loop-out of Farakka-Jeerat
400kV Single circuit line
• 1 No. of 80 MVAR Bus Reactor
• Space provision for at least 2 no. of 400kV bays
M.R. Chauhan/ V.S. BHAL
POWERGRID INDIA
Scope of Work for the interconnector project
Bangladesh Portion
Transmission Line
 Baharampur(India)
–
Bheramara(Bangladesh)
400kV
Double
Circuit
line
(Bangladesh Portion) : App 27 Kms (Twin ACSR FINCH Conductor)
 Loop-in and loop-out of Ishurdi - Khulna South 230kV Double Circuit line at
Bheramara(Bangladesh) : App 5 Kms
M.R. Chauhan/ V.S. BHAL
POWERGRID INDIA
Scope of Work for the interconnector project
Bangladesh Portion
Sub-station
 Establishment of 500 MW HVDC back-to-back station and 230kV
switching-station at Bheramara(Bangladesh)
• Installation of 500 MW HVDC back-to-back terminal.
• 4 nos of 230 kV line bays for LILO of Ishurdi -Khulna South 230kV Double
Circuit line
• Space provision for at least 2 no. of 230kV bays
M.R. Chauhan/ V.S. BHAL
POWERGRID INDIA
Scope of Consultancy Contract
 Pre Award Engineering
 Finalization of Bidding Documents, Assistance in
Tender evaluation
 Post Award Engineering
 Training of PGCB Engineers for 4 weeks
 Construction Supervision
M.R. Chauhan/ V.S. BHAL
POWERGRID INDIA
Details of Various Packages under the India –
Bangladesh Interconnector Project
The Details of various Packages related to the project is given below:
Sl No
Package Details
Date of Award/
Name of Party
Awarded Cost
1
1x500 MW HVDC BTB
Station (Bangladesh
portion)
Contract awarded on 31st Mar 2011
M/s Siemens AG,
Germany
*INR 596.3 Crores
(Euro 76,622,438
BDT 1,569,772,103)
2
400kV Transmission line
(Bangladesh portion
Contract Agreement on
30th December 2010
M/s Cobra ,Spain
*INR 64.40 Crores
(USD 9428067;
BDT 359959882)
3
400 KV Transmission
line (Indian Portion)
Letter of Award issued
on
5th January 2011
M/s A2Z Ltd
INR 71.36 Crores
4
Behrampur S/s (India
Portion)
Letter of Award issued
on 21st December 2010
M/s KEC
International
Limited, Gurgaon,
India
INR 38.29 Crores
( Supply INR
253061573;
Services INR
129871696)
Note: Consultancy Assignment for No. 1 & 2.
M.R. Chauhan/ V.S. BHAL
POWERGRID INDIA
Major Milestones in Consultancy Assignment
A) HVDC Project
Sr.
No
Description
Date
1.
NIT (Two Stage Bidding)
28th Feb'10
2.
OBD (Stage -1 Bid) (Re scheduled)
20th May'10
3.
Clarification meeting with the bidders & finalization of draft amendment
at PGCB Dhaka
2nd- 12th Aug'10
4.
Submission of draft amendment to PGCB at Dhaka
12th Aug '10
5.
Submission of price bid (OBD Stage -2 bid) by bidders
08th Nov '10
6.
Post Bid Discussions & preparation of award documents
09th - 13th Feb'11
Notification of Award
14th Feb 2011
Contract Award
31st March 2011
7.
8.
M.R. Chauhan/ V.S. BHAL
POWERGRID INDIA
Major Milestones in Consultancy Assignment
B) Transmission Line Package (Bangladesh Portion)
Sr.
No
Description
Date
1.
NIT (Single Stage Bidding)
28th Feb'10
2.
Pre Bid Conference
3.
OBD (Stage -1 Bid)
26th April' 10
4.
Discussion on Bid Evaluation with PGCB at Dhaka and submission of
draft clarifications to PGCB
4th- 7th July'10
5.
Receipt of Clarification from Bidders
22nd Aug 2010
6.
Submission of Evaluation report by POWERGRID on the basis of
Clarification received from the bidders
15th Sep'10
7.
8.
29th Mar’10
04th Nov '10
Notification of Award
30th Dec’10
Contract Award
M.R. Chauhan/ V.S. BHAL
POWERGRID INDIA
HVDC SALIENT FEATURES:
HVDC SALIENT FEATURES:
The following transmission data are defined on the DC side at the rectifier:
A
DC Power
Nominal (without redundant cooling)
: 504.2 MW at rectifier
Maximum continuous (with red. Cooling, 1.05 pu) : 529.4 MW at rectifier
Minimum
: 50.6 MW
(10% of rated Power)
B
DC Voltage
Rated
: 158.1 kV
Maximum
: 162.8 kV (1.03 pu)
Minimum
: 155.0 kV (at Overload)
C
DC Current
Nominal (without redundant cooling)
: 3.189 kA
Maximum continuous (with red. Cooling)
: 3.76 kA
Minimum (nominal)
: 320 A (for 10% min. Load)
M.R. Chauhan/ V.S. BHAL
POWERGRID INDIA
HVDC Salient Features:
M.R. Chauhan/ V.S. BHAL
POWERGRID INDIA
Converter Transformer Details:
M.R. Chauhan/ V.S. BHAL
POWERGRID INDIA
Thyristor Valve Data
M.R. Chauhan/ V.S. BHAL
POWERGRID INDIA
Valve Hall Configuration
Valve Hall Configuration
Smoothing Reactor
Air core reactor located outside the valve hall.
Two unit of 30 mH to be installed for 500 MW block.
- Nominal inductance (1 unit) 30 mH
- Current 3200 Amps
- Maximum continuous current 3762 Amps
M.R. Chauhan/ V.S. BHAL
POWERGRID INDIA
Reactive Power Details of the Project:
M.R. Chauhan/ V.S. BHAL
POWERGRID INDIA
Filter Configuration 400kV Side:
M.R. Chauhan/ V.S. BHAL
POWERGRID INDIA
Filter Configuration 230 kV Side:
M.R. Chauhan/ V.S. BHAL
POWERGRID INDIA
Interconnection of
India-Sri Lanka Electricity Grids
M.R. Chauhan/ V.S. BHAL
POWERGRID INDIA
Interconnection of
India-Sri Lanka Electricity Grids
Introduction
Context/Background
Scope of work
Major Milestones
Salient Features of HVDC system
M.R. Chauhan/ V.S. BHAL
POWERGRID INDIA
Introduction
• MoU Signed between GoI & GoSL on 9th June, 2010 for carrying out
feasibility study for interconnection of India-Sri Lanka Electricity Grids
• Executing Agency : POWERGRID (India) & CEB (Sri Lanka)
• The HVDC link would consist of overhead line in the territories of India
and Sri Lanka and submarine cable for the sea portion between the end
point of overhead portion of Indian and Sri Lankan side.
M.R. Chauhan/ V.S. BHAL
POWERGRID INDIA
India – Sri Lanka Interconnection
HVDC Line Length in Indian territory: 130KM(Approx.)
Submarine Cable Length between India and Sri Lanka:120KM
HVDC Line Length in Sri Lankan territory: 110KM(Approx.)
M.R. Chauhan/ V.S. BHAL
POWERGRID INDIA
India – Sri Lanka Interconnection
M.R. Chauhan/ V.S. BHAL
POWERGRID INDIA
Proposed Route for Interconnection
Madurai
Panaikulam
Thirukketiswaram
New Anuradhapura
M.R. Chauhan/ V.S. BHAL
POWERGRID INDIA
Scope of Work
1000MW HVDC System from India(Madurai) to Sri Lanka(New Anuradhapura):
360km
Indian Territory (Scope : POWERGRID ) Madurai to Panaikulam : 130km
– Establishment of new 400kV S/s at Madurai
– Madurai(New) – Madurai 400kV D/c line (50 km)
– Madurai(India) to Indian Sea Coast(Panaikulam) HVDC overhead line : (130km)
– HVDC Terminal (4x250MW in two stages or 2x500MW in two stage or 2x500MW
Single Stage) at Madurai(India)
M.R. Chauhan/ V.S. BHAL
POWERGRID INDIA
Scope of Work
Sea Route (Scope : POWERGRID) Panaikulam(India) to Thirukketiswaram(SL) : 120km
– India Sea Coast(Panaikulam) to Sri Lankan Sea coast (Thirukketiswaram) HVDC
line (Submarine Cable) (120 km)
Sri Lankan Territory (Scope : CEB) Thirukketiswaram) to New Anuradhapura : 110km
– Sri Lankan Sea Coast(Thirukketiswaram) to New Anuradhapura(Sri Lanka)
HVDC overhead line in Sri Lankan Territory (110km)
– HVDC Terminal (4x250MW in two stages or 2x500MW in two stage or 2x500MW
Single Stage) at New Anuradhapura (Sri Lanka)
M.R. Chauhan/ V.S. BHAL
POWERGRID INDIA
Scope of Work: Feasibility Study
The feasibility study report for land route in Indian Territory and complete sea route is
under the scope of POWERGRID while feasibility study report for land route in Sri
Lankan territory is under the scope of CEB.
The estimated cost of the feasibility study is US$ 3.0 Million, to be shared by Govt. of
India and Govt. of Sri Lanka in equal proportion. Out of this the share of
POWERGRID and CEB are US$2.375 Million and US$0.625 Million respectively for
the tasks assigned to them.
M.R. Chauhan/ V.S. BHAL
POWERGRID INDIA
Scope of Work: Feasibility Study
POWERGRID’s portion of the major scope of feasibility study completed. Minor
modification required due to increase in undersea cable length as intimated by CEB
recently.
CEB portion of the feasibility study is under preparation. CEB has awarded the
above work to POWERGRID
Task Force and Steering Committee Meeting-
3rd and 4th of August,
2011 at New Delhi.
Final Submission of the feasibility study report-
Completion by Dec., 2011
M.R. Chauhan/ V.S. BHAL
POWERGRID INDIA
Project Summary
Details of HVDC Interconnection : All the following options would be studied in the
DPR
HVDC Terminal Capacity
– Option-I : 4x250MW terminal in two stages
– Option-II : 2x500MW terminal in two stages
– Option-III : 2x500MW terminal in single stage
HVDC Technology – Conventional and VSC
– VSC technology can be operated under black start
– With VSC technology, there will be increase in the cost of the entire system
M.R. Chauhan/ V.S. BHAL
POWERGRID INDIA
Project Summary
Option I (With Conventional Thyristor based System): ± 400kV, 4x250MW in two stages
Stage I: ± 400kV, 2x250MW
Stage II: ±400kV, 2x250MW
Option I (With Voltage Source Converter based System): ±320kV, 4x250MW in two stages
Stage I: ± 320kV, 2x250MW
Stage II: ± 320kV, 2x250MW
M.R. Chauhan/ V.S. BHAL
POWERGRID INDIA
Project Summary
Option II (With Conventional Thyristor based System): ±400kV, 2x500MW in two stages
Stage I: ±400kV, 1x500MW
Stage II: ±400kV, 1x500MW
Option II (With Voltage Source Converter based System): ±320kV, 2x500MW in two stages
Stage I: ±320kV, 1x500MW
Stage II: ±320kV, 1x500MW
M.R. Chauhan/ V.S. BHAL
POWERGRID INDIA
Project Summary
Option III (With Conventional Thyristor based System): ±400kV, 2x500MW in single stage
Option III (With Voltage Source Converter based System): ±320kV, 2x500MW in single stage
± 400kV Conventional Thyristor based System is using Mass Impregnated Cable and ±320kV
Voltage Source Converter uses extruded cable.
M.R. Chauhan/ V.S. BHAL
POWERGRID INDIA
Basic HVDC Single Line Diagram
M.R. Chauhan/ V.S. BHAL
POWERGRID INDIA
Configurations: Bipolar System
M.R. Chauhan/ V.S. BHAL
POWERGRID INDIA
Configurations: Monopolar Ground Return
M.R. Chauhan/ V.S. BHAL
POWERGRID INDIA
Monopole with metallic return conductor
One pole one conductor for
transmission and the return current
is through metallic return.
M.R. Chauhan/ V.S. BHAL
POWERGRID INDIA
HVDC Technology: Thyristor based VS IGBT based
Description
Classic
VSC
Converter Valves
SCR
IGBT
Connection Valve-AC
Grid
Converter Transformer
Transformer+Reactor
Filtering
50% in filters and shunt Less Filter required.
Capacitor
Dc Current Smoothing
Smoothing Reactor
M.R. Chauhan/ V.S. BHAL
POWERGRID INDIA
DC Capacitor
HVDC Technology: Thyristor based VS IGBT based
Thyristor based Conventional HVDC System
 Uses conventional Thyristors (SCRs)
 Needs ac voltage source for commutation.
 Can not Supply reactive power to the ac system.
 Based on conventional thyristors it utilizes ac system voltage for commutation of
current from one valve to another.
 This converter can convert and control active power in either direction, but in doing so
consumes reactive power.
M.R. Chauhan/ V.S. BHAL
POWERGRID INDIA
HVDC Technology: Thyristor based VS IGBT based
IGBT based HVDC System
•
Lesser space and height requirements.
•
Active and Reactive power: Independent Control
•
No Commutation failure: Commutation is the process in which SCR is
turned off when current is zero.
•
Black Start Capability: The ability to start-up a collapsed network. In such
case it acts as a virtual generator.
•
Shorter time for installation and commissioning
In VSC, the roles of rectifier and inverter can be interchanged between the stations any time without
delay, without breaker switching and without polarity reversal.
M.R. Chauhan/ V.S. BHAL
POWERGRID INDIA
HVDC Technology: Thyristor based VS IGBT based
LCC
VSC
Mature Technology-Since 1954
Emerging Technology-Since 1997
Large Site area, dominated by harmonic filters
Compact site area almost half of LCC Site area
High Power capability up to 7200MW at ±800kV
Limited Power Capability with 1000MW at
±320kV
Weak reactive power control
Good reactive power control
Generates harmonic distortion, AC and DC Filters
required.
No Harmonic generation no filters required
Low Station Losses (Approx. 0.8%)
High Station losses (Approx.1.1%)
Needs converter transformer built by specialist
facilities
Conventional Transformer
Power is reversed by reversal of dc voltage polarity
Power reversal by reversal of dc current
polarity
Current- Sourced
Voltage-Sourced
Line-commutated
Self-Commutated
No Black Start Capability
Black Start Capability
M.R. Chauhan/ V.S. BHAL
POWERGRID INDIA
Sea between India and Sri Lanka
M.R. Chauhan/ V.S. BHAL
POWERGRID INDIA
Sea profile in General
 The general sea profile between India and Sri Lanka Sea Coast is of
shallow nature except at certain places.
 The topography in general is smooth except at Rameshwaram end.
 Generally, the sediments are olive grey colored fine clays at top of
the core and coarse sand at the bottom with fragments of shells
throughout the cores.
 The data suggest several trawl drag marks suggesting heavy
fishing activity both in Indian and Sri Lankan territory.
M.R. Chauhan/ V.S. BHAL
POWERGRID INDIA
M.R. Chauhan/ V.S. BHAL
POWERGRID INDIA