Western Regulation Usage
and
Pilot Program Results
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Regulation Usage
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Real Time Load/Resource Balancing
Frequency Response
Net Interchange Deviations
Maintain Uniform Ramp rates for
Generation Dispatch and Net Interchange
Schedule Changes
Inadvertent Payback
COI Mitigation (initial response)
BA Supplemental Regulation
Time Error Correction
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Regulation Users
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SNR Operations
SNR Merchant
SNR LSE’s
Host BA (SMUD now BANC)
WECC Interconnected Utilities
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Regulation Refresher
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Generating Units are set up to Receive Signals From an
EMS AGC placed on Regulation.
WASN Provides 27 MW of Regulation for LSE Control
Performance and another 33 MW’s to manage SBA
Control Performance Requirements which equates to 60
MW’s of Regulation in the Up and Down Direction.
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Inadvertent payback is limited to 10 MW (+) or (-).
Transmission loss forecast errors vary, but can be
anywhere from 10 MW to as much as 50 MW. This
Variance is Normally Driven by Market Conditions
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Regulation Reduction Pilot Test
Conclusions
The Pilot Test Provided Enough Data to
Support the Reduction of Regulating
Margins During Certain Timeframes and
Western’s Ability to Maintain Reliable
Operation of the Western SBA
The Test Also Indicated that the
Requirements for Regulation are not Flat
and Vary With System Conditions
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Regulation Reduction Pilot Test
Conclusions
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The Pilot Test Results and Supplemental
Studies by Operations Indicate that There
are Additional Hours Where Regulation
May be Reduced and Still Maintain Reliable
Operation of the Western SBA
Western Will Coordinate with the USBR to
Examine Those Hours and Times When
this May be Possible
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Future Regulation Pilot Test
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Propose Another Pilot Test Beginning on
or about Oct. 1, 2011
Test to Include a Reduction in Up and
Down Regulation
Test to Run for Approximately 180 Days,
Concluding on or about March 31, 2012
Western Will use 60 MW of Up and Down
Regulation as the Base Requirement
Test Will Use Varying Levels of Reduced
Up and Down Regulation.
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Regulation Usage Studies
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Operations Examined SBA Regulation
Usage for the 2010 Calendar Year
Including the Pilot Test Period
All 8760 Hours Were Sampled Each Hour
Was Polled Twice Producing Over 16,000
Snapshots Each Snapshot has a Minimum
of 10 Data Points
Operations Also Examined SBA
Performance on an Hourly basis for 2010
Producing 8760 Data Points
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Regulation Usage Studies Data
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SBA NIA
SBA NIS
CVP Gen Scheduled
CVP Gen Actual
CVP Gen Set Point
SBA Load
Hourly Load Change
Hourly Tie Change
Hourly Gen Change
LSE Hourly Deviation
SBA Losses
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Preliminary Study Results
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Regulation Requirements are Reduced
during the Late Fall, Winter and Early
Spring
Regulation Requirements Increase during
the Warmer Months
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Preliminary Study Results
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More than 40 MW of Down Regulation was
Used in 254 Hours
More than 40 MW of Up Regulation was
Used in 300 Hours
The SBA used 60 MW of Down Regulation
in 53 Hours
The SBA used 60 MW of Up Regulation in
35 Hours
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Peak Day Study Results
August 25, 2010
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SBA Load 1501 MW @ 16:45
SBA Load 1495 MW @ 17:15
SBA Peak Load 1520 MW @ Approx. 17:00
SBA NIA 140 MW (Net Exporter)
SBA NIS 130 MW (Net Exporter)
CVP Gen Scheduled 1169 MW
CVP Gen Actual 1199 MW
LSE Deviation -1 MW (Coming to the SBA)
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Peak Day Study Results
August 25, 2010
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LSE Total Deviation for the Day -125 MWH
(Delivered to the SBA)
LSE Average Deviation for the Day -5.20
MWH (Delivered to the SBA)
LSE Hourly Peak Deviation for the day -16
MWH (Delivered to the SBA)
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Peak Day Study Results
August 25, 2010
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SBA Daily Scheduling Delta 385 MWH
(Delivered from the SBA)
SBA Hourly Average Scheduling Delta 16
MWH (Delivered From the SBA)
SBA Peak Hourly Scheduling Delta 39
MWH (Delivered From the SBA)
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Monthly Study Results
August 2010
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LSE Maximum Daily Deviation 205 MWH
(Delivered From the SBA)
LSE Maximum Daily Deviation -144 MWH
(Delivered to the SBA)
LSE Maximum Hourly Deviation 33 MWH
(Delivered from the SBA)
LSE Maximum Hourly Deviation -23 MWH
(Delivered to the SBA)
LSEs out of Bandwidth 1 hour on 8/21 33 MWH
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Preliminary Study Conclusions
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Initial Data Suggests that that Loss
Forecast Error and Net Interchange
Deviations (Exports) Require More
Detailed Analysis
Regulation Usage Patterns are Seasonal
LSE Deviation (Regulation Usage) is
Relatively Neutral, Both + and –
There is opportunity to reduce the Amount
of Regulation Necessary to Maintain
Reliability
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Next Steps
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Analyze the Large Volume of Data in More
Detail
Incorporate the Lessons Learned From the
Regulation Pilot Test into SNR Daily
Operations and the Next Proposed Pilot
Test
GOAL: Reliably Reduce SBA Regulation
Requirements in Both the Up and Down
Direction
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