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TSS report to PCC

TSS report to PCC. June 27-28, 2002 Vancouver, BC. Overview. Late Data Statistics and Procedure Safety Net Task Force Reactive Margin and UVLS Evaluation Under-Frequency Load Shedding Review – Discussion Governor and Load Modeling Program Versions and Conversion Status

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TSS report to PCC

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  1. TSS report to PCC June 27-28, 2002 Vancouver, BC

  2. Overview • Late Data Statistics and Procedure • Safety Net Task Force • Reactive Margin and UVLS Evaluation • Under-Frequency Load Shedding Review – Discussion • Governor and Load Modeling • Program Versions and Conversion Status • Generator Testing Status Report • Transmission Project Rating Review • Other (PSS assignment & Bus Section Breaker Failure)

  3. Late Data Statistics and Procedure • Late Data Log & Summary • Improvement in responses • BPA committed schedule • Reduced delays • Program success contingent on continued improvement

  4. Safety Net Task Force • Assignment from PCC to assess effects of Safety Net Policy • New task force chair - Milt Percival (WAPA) • Compiling survey results

  5. Reactive Margin and UVLS Evaluation • Satisfying Recommendations to perform reactive margin studies & evaluate need for implementing UVLS • Reactive Margin Studies TF is compiling responses of WECC members

  6. Underfrequency Load Shedding Task Force • Work in Progress Draft Report • For Southern Island: Existing program meets requirements • For Northern Island & Pacific NW: New studies are being corroborated with studies done by BPA

  7. Southern Island Studies • Existing program study results: Loss of COI, NE/SE separation, 30% gen loss • Dip to 57.8, Stall at 59.7 Hz (1) • generic load shed data • Dip to 57.9, Stall at 59.4 Hz (7) • existing Master Data File • Survey to update data has been sent out • Dip to 57.7, Stall at 59.3 Hz (8) • ggov1 & FRR units only

  8. Generator Minimum Trip Conflicts with Generators Under-frequency Trip Protection Table 2. Minimum Off-Nominal Generator Requirements Underfrequency Limit Overfrequency Limit Minimum Time 60.0-59.5 Hz 60.0-60.5 Hz N/A (continuous operation) 59.4-58.5 Hz 60.6-61.5 Hz 3 minutes 58.4-57.9 Hz 61.6-61.7 Hz 30 seconds 57.8-57.4 Hz 7.5 minutes 57.3-56.9 Hz 45 cycles 56.8-56.5 Hz 7.2 cycles Less than 56.4 Hz Greater than 61.7 Hz Instantaneous trip

  9. Generator Minimum Trip • Evaluating the increase to Underfrequency Limit floor to > 57 Hz in existing program • Cannot increase Underfrequency Limit floor to > 58.2 Hz in existing program - Siemens W501F Gas Turbine • Five modifications of Load Shedding to existing program were tested, and failed to hold frequency decline above 58.2 Hz • (0.1 Hz, 0.2 Hz, 0.5%, 1%, 0.1 Hz/1%)

  10. Siemens W501F Generator Minimum Trip • Four options for discussion • Raise & increase Load Shed to arrest > 58.2 • Reduce generation loss planned to cover to < 30% • Require control areas to shed load for generators outside Trip Table • Require generators to arm load/contract with load for generators outside Trip Table

  11. Siemens W501F Generator Minimum Trip • Raise & increase Load Shed to arrest > 58.2 • Studies suggest adding 2.6% to five load shed blocks • Works until generators trip above 58.2 Hz • High impact to loads

  12. Siemens W501F Generator Minimum Trip • Reduce generation loss planned to cover to < 30% • Assume few generators use higher under-frequency threshold • Reducing the generation loss assumption • Does not change the physical system • Raising trip threshold frequency results in higher generation lost, not lower. (continued)

  13. Siemens W501F Generator Minimum Trip • Reduce generation loss planned to cover to < 30% • Continuous reductions needed with more generators raising trip settings • Can generator manufacturers accept the risk of loss of life for the unit operating outside its design capabilities?

  14. Siemens W501F Generator Minimum Trip • Require control areas to shed load for generators outside Trip Table • For independent control areas, would the buyer of the output set up load dropping? • Is this practical if buyer is a long distance away or changes regularly? • How does a single unit control area implement load dropping? • What if the load is already part of the utilities UFLS Plan?

  15. Siemens W501F Generator Minimum Trip • Require generators to arm load for generators outside Trip Table • Economic tradeoff • Could the generator contract directly with a load? • Is contracting with a specific load to trip physically & technically feasible?

  16. Reliability Councils UFLS Programs Table 3. Summary of Reliability Councils UFLS Programs Percent (%) Load Shed at Frequency (Hz) Specified Freq. Generator Allowed to Trip Council 59.7 59.5 59.4 59.3 59.1 58.9 58.8 58.7 58.5 58.3 58.2 NPCC 10 15 57 Hz ERCOT 5 10 10 57.5 Hz MAAC 10 10 10 <57.5 Hz ECAR 5 5 5 5 5 <58.2 Hz FRCC 9 7 7 6 5 7 <57.5 Hz WSCC 5.3 5.9 6.5 6.7 6.7 56.4 Hz • Choice of options is a Policy Decision

  17. Governor and Load Modeling • New governor models being tested • ggov1 thermal turbine/governor • Kaplan type hydro turbine/governor • May 18, 2001 Staged Tests being evaluated • Load Modeling Task Force (under M&VWG) • Evaluating models, e.g. including transformer • Evaluating methods to gather & maintain data

  18. Program Versions and Conversion Status • GE program version 13 available for WECC since May 29th • New cases in version 13, and all current year cases to be converted to version 13 • PTI power flow cases converted by WECC staff in version 28 • Staff to begin dynamics conversion by end of summer

  19. Generator Testing Status Report • Completed units in May 2002 • 1425 units that are 10 MW or higher • 1116 units or 78 % have reactive limits tests completed • 948 units or 67 % have dynamics data validation completed • Summary spreadsheet by company is attached

  20. Transmission Project Rating Review Since last PCC meeting: • Entering Phase 1 • Path 59 - Eagle Mountain 230/161 - Blythe Tie • Completing Phase 3 • Path 8, Northwest-Montana, 1350 MW W-E • Path 48, Northern New Mexico Transmission, 1947 MW • Path 36, TOT3, 1605 MW North-to-South

  21. PSS Assignment • In Section 1 c), clarify the meaning of “complex” • Assess whether there is enough PSS on the system, using the latest tools and models • Produce a PSS policy that specifies the required performance for each unit rather than dictating the installation of PSS across the board

  22. Bus Section Breaker Failure • Studies requested by NERC with waiver • RS asked PCC members to report bus section breakers & perform studies • TSS formed task force (RS advising) • Discuss inventory reporting • Study requirements • Study methodologies • Mitigating measures • Provide inventory response by September

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