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Overview of TSS Report to PCC: June 27-28, 2002, Vancouver, BC

This report provides a comprehensive overview of various technical discussions and analyses that took place during the TSS meeting held in Vancouver, BC, on June 27-28, 2002. Key topics include late data statistics and procedures, safety net task force assessments, reactive margin evaluations, and under-frequency load shedding reviews. It highlights generator testing statuses, transmission project ratings, and recommendations for improving system performance, emphasizing the need for continuous improvements in response strategies and modeling for effective load management.

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Overview of TSS Report to PCC: June 27-28, 2002, Vancouver, BC

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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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