july 10, 2008 ros early delivery systems status – r6.3 2 hour test john dumas and jeff gilbertson
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July 10, 2008
ROS
Early Delivery SystemsStatus – R6.3 2 Hour Test
John Dumas and Jeff Gilbertson
2TPTF7/8/2008 2
Agenda
• EDS 3– Release 5 & 6: SCED / LFC
• 2-Hour Total System Test Results
– Test Chronology
– LFC Review
– Constraints
– State Estimator
– System Items of Note
• Future of LFC and SCED Testing
3TPTF7/8/2008 3
• EDS 3– Release 5 & 6: SCED / LFC
• 2-Hour Total System Test Results
– Test Chronology
– LFC Review
– Constraints
– State Estimator
– System Items of Note
• Future of LFC and SCED Testing
Agenda
4TPTF7/8/2008 4
Test Chronology – June 25, 2008
08:00 Taylor Control Room Hotline announcement of EDS 3 LFC R6.3
2 Hour Test to Start at 11:00 09:00 ERCOT discontinues the use of Zonal Congestion Management
Techniques (No OC1s in effect at the time)10:50 Taylor Control Room Hotline announcement of EDS 3 LFC R6.3
2 Hour VDI effective Market Wide at 11:00 AM11:00 Taylor Control Room Issues first Zonal to Nodal Switching Order12:18 Last QSE Confirms Switch to Nodal12:18 – 12:47 ERCOT manages Grid Control via Nodal12:47 First QSE confirms switch back to Zonal13:37 Last QSE confirms switch back to Zonal14:40 ERCOT resumes the use of Zonal Congestion Management
Techniques15:00 VDI Ended
5TPTF7/8/2008 5
LFC CPS1 Scores
-200
-150
-100
-50
0
50
100
150
200
250
0900 0930 1000 1030 1100 1130 1200 1230 1300 1330 1400 1430 1500
CPS1 Score
Time
CPS1 During 6/25/08 EDS3 R6.3 Test
CPS1 - 1 Min.
CPS1 - 1 Hr.
First QSE switched to NodalAll QSEs on Nodal
First QSE switched back to ZonalAll QSEs back on Zonal
CPS1 Score (1 Min.) Average
All in Zonal (900-1106)
107.27
Transition to Nodal (1107-1217)
111.25
All in Nodal (1218-1247)
159.92
Transition to Zonal (1248-1337)
120.04
All in Zonal (1338-1530)
125.27
6TPTF7/8/2008 6
LFC Regulation, Total Load and Total Generation
37000
40000
43000
46000
49000
52000
55000
58000
-800
-600
-400
-200
0
200
400
600
800
1000
0900 0930 1000 1030 1100 1130 1200 1230 1300 1330 1400 1430 1500 1530
Time
Total Regulation Deployed in Zonal and Nodal and Total Load and Generation
Nodal Reg. Deployed
Zonal Reg. Deployed
Load
Generation
First QSE switched to Nodal All QSEs on NodalFirst QSE switched back to Zonal
All QSEs back on Zonal
7TPTF7/8/2008 7
LFC Transition Time and Nodal Operation Duration
0.00
0.20
0.40
0.60
0.80
1.00
1.20
Fraction
Time
Fraction of the ERCOT Total Generation, Regulation Up Responsibility and Regulation Down Responsibility being Controlled by Nodal
Generation
Reg. Up
Reg. Down
8TPTF7/8/2008 8
Constraints
Nodal RTCA & Zonal RTCA showed the same contingency violations.
Constraints in effect from 9:30 and throughout the test:Austrop Transformer
Loss of #2 Austrop 345/138kV transformer overloads #1 Austrop 345/138kV transformerDue to Generation Topology
Brownwood SwitchLoss of 345kV Temple Switch to Lake Creek & Temple Pecan Creek to Tradinghouse double circuit overloads Brownwood Switch to Goldthwaite 138kV lineA CRE for the North to South (Zonal) corridor
9TPTF7/8/2008 9
State Estimator Convergence (15 MW/30 MVAR Mismatch Tolerance)
June 25th
0%
10%
20%
30%
40%
50%
60%
70%
80%
90%
100%
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24
Hour Ending
Convergence
09:37 - Large change in breaker status that went from closed to open due to a QSE’s ICCP data failure, impacted hour ending 10.
10:30 - RTU went down impacting telemetry from 3 units, impacted hour ending 11.
10TPTF7/8/2008 10
Limits during test period 6/25, 11am – 1pm
GTBD within 2000-3000MW of HDL (plenty of room). LEL > LSL for all but four intervals of test – check your telemetered LEL and LSL
20000 MW
25000 MW
30000 MW
35000 MW
40000 MW
45000 MW
50000 MW
55000 MW
60000 MW
65000 MW
6/25/2008 10:00 6/25/2008 10:30 6/25/2008 11:00 6/25/2008 11:30 6/25/2008 12:00 6/25/2008 12:30 6/25/2008 13:00 6/25/2008 13:30
SUM_HEL
SUM_HSL
SUM_HASL
SUM_HDL
GTBD
SUM_LDL
SUM_LASL
SUM_LSL
SUM_LEL
11TPTF7/8/2008 11
Reference LMP, Max LMP, Min LMP
Two constraints implemented for entire test – limits not reached until halfway through test Reference LMPs steady increase from $95 to $122 Temporary Max/Min LMP reduction at 12:35; transformer constraint not at limit briefly
0
10000
20000
30000
40000
50000
60000
10:00 10:30 11:00 11:30 12:00 12:30 13:00 13:30
-1000
-500
0
500
1000
1500
2000
GTBD
MAX LMP
MIN LMP
REFERENCE_LMP
12TPTF7/8/2008 12
Distribution of Prices with Line Constraint (12:30)
288 of 433 (66%) Resource node LMPs at $109.11 Max $1,388; Min -$425
Distribution of LMPs 6/25 12:30
10 1 10 11 10 5 439
288
55
7728 MW
488 MW 2907 MW 930 MW
0 MW
150 MW
377 MW3944 MW
34016 MW
0 MW0
50
100
150
200
250
300
350
-$425 -$0
$105.25 $109.11 $226-$227
$246-$255
$260-$280
$414-$875
$911-$964
$1076-$1090
$1,388
LMP
# o
f R
eso
urc
e N
od
es a
t L
MP
MW
5000 MW
10000 MW
15000 MW
20000 MW
25000 MW
30000 MW
35000 MW
40000 MW
MW
of
Res
ou
rce
as L
MP
# Resources
MW
13TPTF7/8/2008 13
Reference LMP, GTBD, SPP, Zonal MCPE (6/25)
Reference LMP comparable to MCPE (Zonal MCPE same in all Zones throughout test) Maximum difference of $14 between LMP and MCPE at beginning of test Differences between LMP/SPP/MCPE $0-$10 throughout test, except for South Zone
$50.00
$100.00
$150.00
$200.00
$250.00
$300.00
$350.00
$400.00
10:00 10:30 11:00 11:30 12:00 12:30 13:00 13:30
MW
10000 MW
20000 MW
30000 MW
40000 MW
50000 MW
60000 MW
LZ-W
LZ-N
LZ-S
LZ-H
Ref LMP
Zonal
HB-W
HB-N
HB-S
HB-H
GTBD
14TPTF7/8/2008 14
System Items of Note
Permissive Control for UDBP was not in effectRLC p1 parameter set at 1.0 which affects operation below
the LSL (will change to 0.9)Regulation Reduction was in effect and will need further
tuning before next LFC testSCED issue identified and to be corrected before next test
(memory issue) No off cycle SCED runs executedCombined Cycle Configuration Validation Check was not
effect
15TPTF7/8/2008 15
Agenda
• EDS 2 – Release 3: Telemetry & State Estimator
• EDS 3– Release 5 & 6: SCED / LFC
• 2-Hour Total System Test Results
– Test Chronology
– LFC Review
– Constraints
– State Estimator
– System Items of Note
• Future of LFC and SCED Testing
16TPTF7/8/2008 16
Near-Term Future of State Estimator
• MW and MVar tolerance set to 15 on July 1 based on last ½ of June results (~91% Convergence)
• Staffing shift engineers in 24-hr incremental blocks in August to drive SE issues and build toward 24x7 real-time operations– ‘Blackout’ will be communicated to MPs and all efforts should be made
to keep systems running and accurate– On non-blackout dates ERCOT will continue to monitor 8x5
• These efforts will position ERCOT and MPs well for an 8-Hour LFC test in Mid-September– With or without CIM– A longer test is needed for MPs and ERCOT to tune their systems
17TPTF7/8/2008 17
8 Hour Test
Preparation activities for 8 Hour Test
ERCOT Publish LFC 2 Hour Test ReportResolve SCED memory issueFurther LFC tuning effortsWork with MP’s towards State Estimator and Telemetry Standard
complianceWorks with MP’s towards a 24 X 7 Nodal operation support (ICCP)Schedule LFC Phase 3 Test Work ShopSchedule Blackout Days for State Estimator convergence testingSchedule LFC 8 hour test
18TPTF7/8/2008 18
Near-Term Future of SCED
• ERCOT proposal for Real-Time submissions until re-plan is complete– ERCOT will continue to run SCED / Post Real-Time LMPs
• QSEs continue TPO submittals up to 30-days in advance– TPO’s should continue to cover 80-120% of cost– Min Energy / Startup Costs may be 0.00 since no DAM/RUC execution– FIP / FOP % must still continue to = 100% combined
• COP will only be required in the case of using an output schedule– Output schedules use the sustainable limits in the COP for validation– In this circumstance, COP’s updates are not required in Adjustment Period
– ICCP • ICCP must continue to be in place 24/7 to support State Estimator and basic SCED
input values – Basic data required include configuration, MW output, breaker status, HSL, LSL.– Ancillary Services not required (zero for AS Schedules and Responsibility)
• ICCP data quality must continue to be monitored and problems resolved• These are the ongoing requirements communicated to the market from November of
2007
– ERCOT will implement 24/7 constraint management in nodal systems starting 7/5
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