PDCWG Report to ROS
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PDCWG Report to ROS Sydney Niemeyer Chair NRG Energy Don Blackburn Vice Chair Luminant Energy
description
PDCWG Report to ROS. Sydney Niemeyer Chair NRG Energy Don Blackburn Vice Chair Luminant Energy. May 28 Meeting. Manual Deployment and Recall of Responsive Reserve Service during Scarcity Conditions. Discussion Items: Loss of available Primary Frequency Response. - PowerPoint PPT Presentation
Transcript of PDCWG Report to ROS
PDCWGReport to ROS
Sydney Niemeyer ChairNRG Energy
Don Blackburn Vice ChairLuminant Energy
May 28 Meeting• Manual Deployment and Recall of Responsive
Reserve Service during Scarcity Conditions.– Discussion Items:
• Loss of available Primary Frequency Response.• Concern with ERCOT’s ability to estimate available
Primary Frequency Response.• Resource Real-time HSL accuracy.• ERCOT logic change needed for manual Recall to avoid
auto recall based on frequency returning to 59.970 Hz.
• ERCOT researched and found only 3 times the manual deployment would have been executed since April 2012.
Loss of Primary Frequency Response
• As RRS is manually deployed and SCED utilizes the capacity, Primary Frequency Response and the depth of that response will be depleted.– Higher risk of not meeting BAL-003-1– Loss of Load risk increases significantly.– Fewer Resources will be maintaining frequency
stability increasing Resource output movement and resulting loss of controllability.
– If RRS capacity is not manually deployed, frequency will decay and the energy will be delivered through Primary Frequency Response anyway.
Estimating Available Primary Frequency Response in Real Time
• The available Primary Frequency Response can change quickly depending on loading of Resources.
• Accurate HSL’s and identification of how much spinning reserve is actually frequency responsive is greatest concern in estimation.
• Deploys RRS before Regulation Up Service since REGUP is deployed based on grid frequency.
Resource HSL Accuracy• Augmented capacity on Resources that is contained
within the HSL is typically not frequency responsive. Telemetry of this information is not available at this time.
• Ambient temperature and humidity impacts HSLs. Most Resources do not update HSL in Real Time based on current conditions.– While reviewing Disturbance Reports, it is apparent that
there is greater than a 2% error in their HSL on many Resources.
– ERCOT discounts HSLs in the PRC calculation by:• Decrease HSL by 1% if ambient temp </= 95 degrees F.• Decrease HSL by 2% if ambient temp > 95 degrees F.
RRS Recall Logic
• Presently RRS is automatically recalled when frequency recovers to 59.970 Hz following a deployment at 59.910 Hz.
• ERCOT will have a logic change implemented prior to July 1 for the manual deployment of RRS. This will allow RRS to remain deployed independent of grid frequency when deployed manually.
Frequency of Manual Deployment of RRS
• ERCOT researched historical PRC data.– Since April 2012 there would have been 3 manual
deployments of RRS based on the criteria in this procedure.
Other Meeting Subject Discussions• Resource GREDP review for the month of May through
the 26th.– Status quo on number of Resources struggling to meet the
metric.– Significantly poor performers have been contacted by
ERCOT. Escalation to TRE may be necessary on a few.• BAL-001-TRE-1 implementation timeline was reviewed.
ERCOT project internally to start in late June to meet BA requirements.– TRE expressed concern that FAST is suggesting an increase
if governor dead-bands on some Resources and the resulting decrease in Primary Frequency Response from these Resources.
Other Meeting Subject Discussions• TRE Update:
– NERC Standard activity• PRC-005 adding “sudden pressure relay” to the list of covered protective
relays.• PRC-002 Disturbance Monitoring adding phasor monitoring to Resources for
model verification.• Bulk Electric System definition webinar June 5th.• NERC State of Reliability Report identified significant improvement in 2013 in
Primary Frequency Response performance in ERCOT.• Significant drop in poor performing Resources in ERCOT Disturbance Analysis
reports during 2013.• ERCOT LFC Tuning Changes implemented.
– May 27 at 09:30 ERCOT made LFC tuning changes.– Immediate improvement in CPS1 of 8 to 10 points observed since the
change. CPS2 improvement as well as Time Control is better.
ERCOT Disturbance Reports Reviewed
• May 1, 2014 Frequency Event.– 15 Resources had issues with Primary Frequency Response.
• 8 of these Resources may have augmented spinning reserve and therefore not frequency responsive.
• 3 Resources had possible HSL errors.• May 13, 2014 High Frequency Event- DC tie trip.
– Present evaluation tool does not accurately measure response to High frequency deviations.
– Wind Generators as a fleet performed well.• May 15, 2014 Frequency Event
– 4 Resources had issues with Primary Frequency Response.• One Resource had early PFR withdrawal.• Three Resources had low PFR delivery with one of these believed to have
augmented spinning reserve capacity.• One Resource did not follow SCED deployments during the frequency
recovery period.
ERCOT Frequency Control ReportMay 2014
Sydney Niemeyer NRG EnergyJune 3, 2014
Notes
• Time error values from NRG True Time device can be slightly different from ERCOT’s Time Error but the daily delta times should be accurate.
• CPS 1 and CPS 2 data for May is from NRG Frequency True Time device and will be slightly different from ERCOT’s measure. The monthly CPS1 score is typically within +/-0.05.
ERCOT FREQUENCY CONTROLBAL-001 CPS 1 & 2 Performance, RMS 1 and Frequency Profile
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ERCOT CPS1 By Day -
CPS 1 Avg CPS 1 Peak Energy
May-2014
159.05ERCOT Monthly CPS1 =
ERCOT LFC Tuning Change @ 09:30
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ERCOT CPS2 By Day -
CPS 2 Avg CPS 2 Peak Energy
May-2014
97.45ERCOT Monthly CPS2 =
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CP
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ERCOT CPS1
Monthly Average 12 Month Rolling Average
CPS1 12 Month Rolling Average = 162.60
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CP
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Month
ERCOT CPS2 Score*
CPS2
*ERCOT as a single control area is exempt from CPS2. These scores are For Information Only
0.0100
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Daily RMS1 of ERCOT Frequency
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Daily RMS1 of ERCOT Frequency
0.0100
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Daily RMS1 of ERCOT Frequency
60.010 <= HZ < 60.015
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Comparing May 2010 vs May 2014 profile of frequency in 5 mHz bins
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May-14
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ERCOT Frequency Profile Comparison
2010 2014
January through December of each Year
ERCOT TIME ERROR AND TIME CORRECTION
Time Error History
Time Error Corrections
• Eleven slow Time Error Corrections were executed in May.
• Other than the days with the TECs, no days had positive time error.
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ERCOT Time Error
Daily Delta Time Error
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ERCOT Time Error & Time Change
Time Change Time Error
June-2013May-2014
Time Correction HistoryTotal Hours on Avg Hours Avg Corrections % Time on
Year Month Days Fast Slow Count Control Per Correction Per Day CorrectionTime Corrections
2013 Jan 31 0 3 3 9.50 3.17 0.10 1.3%Feb 28 0 6 6 18.00 3.00 0.21 2.7%Mar 31 0 5 5 17.50 3.50 0.16 2.4%Apr 30 0 1 1 5.50 5.50 0.03 0.8%May 31 0 2 2 8.50 4.25 0.06 1.1%Jun 30 0 3 3 12.50 4.17 0.10 1.7%Jul 31 0 0 0 0.00 0.00 0.00 0.0%Aug 31 0 0 0 0.00 0.00 0.00 0.0%Sep 30 0 0 0 0.00 0.00 0.00 0.0%Oct 31 0 0 0 0.00 0.00 0.00 0.0%Nov 30 0 0 0 0.00 0.00 0.00 0.0%Dec 31 0 2 2 11.50 5.75 0.06 1.5%
2014 Jan 31 0 6 6 21.75 3.63 0.19 2.9%Feb 28 0 5 5 16.50 3.30 0.18 2.5%Mar 31 0 7 7 22.00 3.14 0.23 3.0%Apr 30 0 9 9 28.00 3.11 0.30 3.9%May 31 0 11 11 35.50 3.23 0.35 4.8%Jun 30 0.00 0.0%Jul 31 0.00 0.0%Aug 31 0.00 0.0%Sep 30 0.00 0.0%Oct 31 0.00 0.0%Nov 30 0.00 0.0%Dec 31 0.00 0.0%
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Monthly Hours on Time Correction
Hours on Control
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sMonthly Time Correction Summary
Slow Fast
ERCOT PRIMARY FREQUENCY RESPONSE PERFORMANCE
BAL-003-1 Interconnection Frequency Response and Bias Measure.
ERCOT Primary Frequency Response – BAL-003-12015 Bias and Frequency Response Measure
Date/Time (t-0) BA BA BA Relay Lmt Value "A" Information Value "B" Information SEFRD (FRM)Time Bias R1 for Bias for R1
BA Time Zone DelFreq Time DelFreq DelFreq MW/Load Lost Adjustment MW/Load Lost Adjustment (MW/0.1Hz) (MW/0.1Hz)
12/2/2013 16:03:54 CST -0.115 16:03:54 -0.115 -0.115 0.0 0.0 842.2 0.0 -729.4 -729.4
12/8/2013 13:07:30 CST -0.068 13:07:30 -0.068 -0.068 0.0 0.0 576.7 0.0 -842.6 -842.6
12/9/2013 8:43:12 CST -0.097 8:43:12 -0.097 -0.097 0.0 0.0 905.2 0.0 -931.6 -931.6
12/17/2013 11:45:44 CST -0.089 11:45:44 -0.089 -0.089 0.0 0.0 785.6 0.0 -881.8 -881.8
12/30/2013 9:44:22 CST -0.108 9:44:22 -0.108 -0.108 0.0 0.0 784.5 0.0 -727.4 -727.4
1/6/2014 8:10:48 CST -0.128 8:10:48 -0.128 -0.128 0.0 0.0 880.8 0.0 -685.6 -685.6
1/13/2014 4:19:44 CST -0.104 4:19:44 -0.104 -0.104 0.0 0.0 834.6 0.0 -799.3 -799.3
1/25/2014 12:07:02 CST -0.077 12:07:02 -0.088 -0.088 0.0 0.0 656.9 0.0 -746.2 -746.2
2/20/2014 21:06:54 CST -0.108 21:06:54 -0.108 -0.108 0.0 0.0 454.2 0.0 -421.4 -421.4
2/28/2014 13:25:56 CST -0.101 13:25:56 -0.101 -0.101 0.0 0.0 515.5 0.0 -512.2 -512.2
3/2/2014 7:37:40 CST -0.105 7:37:40 -0.105 -0.105 0.0 0.0 542.2 0.0 -515.8 -515.8
3/3/2014 7:31:50 CST -0.076 7:31:50 -0.076 -0.076 0.0 0.0 540.9 0.0 -707.5 -707.5
3/10/2014 18:29:28 CDT -0.099 18:29:28 -0.099 -0.099 0.0 0.0 798.2 0.0 -805.4 -805.4
3/19/2014 8:41:08 CDT -0.097 8:41:08 -0.097 -0.097 0.0 0.0 770.2 0.0 -797.4 -797.4
4/2/2014 0:33:26 CDT -0.107 0:33:26 -0.107 -0.107 0.0 0.0 470.7 0.0 -441.2 -441.2
4/29/2014 8:57:58 CDT -0.058 8:57:58 -0.058 -0.058 0.0 0.0 464.0 0.0 -804.7 -804.7
5/1/2014 15:13:50 CDT -0.100 15:13:50 -0.100 -0.100 0.0 0.0 559.1 0.0 -561.6 -561.6
5/13/2014 12:31:02 CDT 0.069 12:31:02 0.069 0.069 0.0 0.0 -420.1 0.0 -608.7 -608.7
5/15/2014 4:20:24 CDT -0.068 4:20:24 -0.068 -0.068 0.0 0.0 447.1 0.0 -655.4 -655.4
5/17/2014 0:47:26 CDT -0.062 0:47:26 -0.062 -0.062 0.0 0.0 573.6 0.0 -917.8 -917.8
-704.64 2014 FRM - Average Estimated Frequency Response MW/0.1 Hz using SEFRD for R1
-684.62 2014 FRM - Regression Estimated Frequency Response MW/0.1Hz using SEFRD for R1
-728.40 2014 FRM - Median Estimated Frequency Response MW/0.1Hz for BA Compliance to R1, minimum Frequency Response
ERCOT TOTAL ENERGY AND WIND PRODUCTION
October Total ERCOT Energy and Total Energy Production from Wind Resources.
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MW
H
ERCOT Total Energy
2008 2009 2010 2011 2012 2013 2014
0
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1,000,000
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4,000,000
MW
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ERCOT Total Energy from Wind Generation
2008 2009 2010 2011 2012 2013 2014
0.00%
2.00%
4.00%
6.00%
8.00%
10.00%
12.00%
14.00%
16.00%
ERCOT % Energy from Wind Generation
2008 2009 2010 2011 2012 2013 2014
