Settlements Calibration

Calibration for
Settlement
Areas
February 2016
Version 1.0
Agenda
•
Unaccounted For Energy (Calibration)
–
Calculation
–
Top Down Load’s Role in that calculation
–
Calibration impact by Settlement Area Losses
2
Unaccounted For Energy occurs for a
Settlement Area when:
Injections (-)
Generation
+
Imports
Withdrawals(+)
Loads
+
Exports
+
Losses (SE Loss)
Generationsa + Importssa + Loadssa + Exportssa + Lossessa = Unaccounted For Energysa
Unaccounted For Energy:
 Unaccounted For Energy – The difference between
Generation, Export, Import, Load, and Losses within a
Settlement area. (Gen and Imp are negative #’s)
 Based on submitted meter values by meter agents.
 Two methods to resolve Unaccounted For Energy are
the use of a Top-Down Load (TDL) by the Market
Participants and Calibration applied by SPP.
What is Calibration
Generationsa + Importssa + Loadssa + Exportssa + Lossessa = Unaccounted For Energysa
• ‘Calibration’ is the method used to distribute ‘Unaccounted
For Energy’ to the loads however those terms are used
interchangeably
• Calibration is applied to Load Settlement Locations within a
Settlement Area by load ratio share.
• It is the Meter Agents/Market Participants responsibility to
submit timely and accurate meter data.
• Since Calibration is based on Actual meter submitted values,
FSE treatment does not affect calibration.
• Section 4.5.9.1 in the protocols contains processes to
calculate and apply calibration (Unaccounted for Energy).
Settlement Area with TDL
Generationsa + Importssa + Loadssa + Exportssa + Lossessa = Unaccounted For Energysa
If there is a TDL:
• The meter value submitted by the TDL is just
another input to the Load part of this calculation
• The meter value submitted for TDL will be based on
a calculation instead of actual meter value.
• The meter value submitted for TDL contains losses
which is “Adjusted” to remove the losses within the
settlement caclulations.
Settlement Area with TDL
Generationsa + Importssa + Loadssa + Exportssa + Lossessa = Unaccounted For Energysa
• SPP uses the State Estimator to calculate these
losses
Settlement Area with TDL
• This example shows a Settlement Area with Load L1 designated as a TDL.
SL
E2
L2
G1
G2
I2
L1 Calculates and submits:
L1 Adj Meter (sub SE Loss)
SE Loss(SPP Calculated)
Calibration
MW Qty
30
20
-100
-50
-50
150
130
20
Settlement
Area
Load L2
+20mwh
Gen G1
-100mwh
Gen G2
-5omwh
SE Loss = +20mwh
Export E2
+30mwh
Load L1
???
Import I2
-50mwh
0
• All other settlement locations submit actual meter values, Load L1 calculation
results in 150 MW
• Settlements calculations adjust the Load L1 150 MW by subtracting 20mwh of SE
Loss giving Load L1 and adjusted meter value of 130 MW which is what the MP
would be charged.
• Allows MP to account for load that is not metered in a Settlement Area. When
calculated correctly, Unaccounted For Energy will be zero.
Settlement Area without a TDL
• If Load L1 is not a TDL, then actual meter value is submitted.
SL
MW Qty
E2
30
L2
20
G1
-100
G2
-50
I2
-50
L1
130
SE Loss
20
Calibration
0
Settlement
Area
Load L2
+20mwh
Gen G1
-100mwh
Gen G2
-5omwh
SE Loss = +20mwh
Export E2
+30mwh
Load L1
+130mwh
Import I2
-50mwh
• Based on ALL meter locations and SE Loss being accurate submitted, Load L1
would have an actual meter of 130 MW.
• Requires all Generation, Loads, Imports, and Exports to be metered and
accurately submitted within the Settlement Area.
Calibration Example
• Unaccounted For Energy or calibration is calculated from meter values for ALL
Settlement Locations within each Settlement Area.
Generationsa + Importssa + Loadssa + Exportssa + Lossessa = Unaccounted For Energysa
SL
E2
L2
G1
G2
I2
L1
SE Loss
Unaccounted For Energy
Settlement
Area
Submitted MW Qty
29
21
-100
-50
-50
129
19
Load L2
+21mwh
Gen G1
-100mwh
Gen G2
-5omwh
SE Loss = +19mwh
Export E2
+29mwh
Load L1
+129mwh
Import I2
-50mwh
-2
• The actual cause of calibration can be difficult to determine and can be due to
numerous issues but the end results in Unaccounted For Energy that must be
accounted for and allocated. In this example, 2MW will be applied to L1 and L2
submitted meter value based by load ratio share to give an adjusted meter value.