Transcript PRR #409 Voltage Support Service from Generating Resources

PRR #409 Voltage Support Service from
Generating Resources
Status of PRR
Timeline
Date Received
Date Posted
Comments Due
PRS Review Date
4/25/2003
4/28/2003
5/19/2003
5/22/2003
May 22nd PRS Action:
Remanded to WMS for further clarification
of settlement treatment
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What the PRR Seeks to do with VSS-f-GR
Establish a realistic payment methodology for
VSS based on an easily captured telemetry
point/calculated value in ERCOT EMS (MVarh)
“as delivered”
Maintain the existing proposed RCVC
Standard requirement for unit testing and
reactive capability (URL of .95)
Set trigger point for settlement for reactive
delivery at a point that recognizes values of
losses in generator and GSU (.98)
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Existing Protocols Treatment
Generator must maintain voltage profile
[limited to MVars delivered at Max. MW @ .95 Pf
measured at MPT HV terminals] (6.5.7)
Generators must maintain voltage regulation schedule without
compensation to .95 Pf (6.8.4)
Dispatch instructions that cause a reduction in MWs to produce
more MVars paid at OOM-E Down price (6.8.4.(2))
PIP-102 boxed language: “Compensated Reactive Support” pays
for reactive delivery that exceeds URL at avoided cost of
reactive resources on transmission network. [PIP-102 is to be
implemented on ERCOT systems this year; 2.1 Priority]
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What are the costs to producing
Mvars?
Installed Capability Costs
what is the appropriate value for those
components of the generator equipment that
make MVar production possible?
Lost Opportunity Costs
what is the value of the next MVar vs. the
next MW?
Heating Losses
what is the cost in fuel to produce MVars?
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Basis for these assertions
Installed Capability Costs
American Electric Power Service Corporation 88 FERC ¶ 61,141
(“AEP”)
[basis for numerous FERC-approved rate filings on OATT
Schedule 2]
ERCOT Protocols 6.8.4.(2)
[“avoided cost of reactive support Resources on the
transmission network.”]
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Basis for these assertions (cont’d)
Lost Opportunity Costs
ERCOT Protocols 6.8.4.(2)
Numerous FERC rulings re: OATT Schedule 2
Heating Losses
Stray Loss Factor (per EPRI TR-107270-V3SI) accepted in
numerous FERC rulings on OATT Schedule 2 filings
Incremental heating loss = Stray LF * [3*Ra*[(Ia pf.85)2 -(Ia pf=1)2] + [Rf*[(If
2
2
pf=.85) -(If pf=1) ]]
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WMS task from PRS
Determine a suitable settlement method for
reactive delivered
MVarh delivered beyond trigger (+-.98 Pf) can be
calculated/integrated over an interval.
Can Synchronous Condenser treatment in Protocols 6.8.3.4 be
used as a proxy pricing mechanism?
Can some portion of the MCPE/Zone of delivery be used as a suitable
price proxy if Heating Losses principle is used?
Can a “(MW losses from heating) X HSC Price for Gas X 10.5 HR
(customary losses treatment in ERCOT)” approach be acceptable?
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