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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

TSS report to PCC

June 27-28, 2002

Vancouver, BC


Overview
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)


Late data statistics and procedure
Late Data Statistics and Procedure

  • Late Data Log & Summary

  • Improvement in responses

  • BPA committed schedule

    • Reduced delays

  • Program success contingent on continued improvement


Safety net task force
Safety Net Task Force

  • Assignment from PCC to assess effects of Safety Net Policy

  • New task force chair - Milt Percival (WAPA)

  • Compiling survey results


Reactive margin and uvls evaluation
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


Underfrequency load shedding task force
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


Southern island studies
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


Generator minimum trip
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


Generator minimum trip1
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%)


Siemens w501f generator minimum trip
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


Siemens w501f generator minimum trip1
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


Siemens w501f generator minimum trip2
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)


Siemens w501f generator minimum trip3
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?


Siemens w501f generator minimum trip4
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?


Siemens w501f generator minimum trip5
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?


Reliability councils ufls programs
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


Governor and load modeling
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


Program versions and conversion status
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


Generator testing status report
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


Transmission project rating review
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


Pss assignment
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


Bus section breaker failure
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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