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System Strength/Short Circuit Current Minimum Requirement. June 5, 2014. Background. In parallel with the ERCOT PREZ Study, Sharyland has been evaluating the transmission system performance in the Panhandle region, specifically:

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In parallel with the ERCOT PREZ Study, Sharyland has been evaluating the transmission system performance in the Panhandle region, specifically:

  • Including generation resources meeting Section 6.9 of the ERCOT Planning Guides

  • Completed assessments for the Panhandle Region including:

    • steady state voltage security

    • transient voltage stability

    • system strength assessments

  • Issue:

    • The ERCOT Panhandle region does not have synchronous generators/machines or loads, which provide system strength to the grid via short circuit current ratio (SCR)

    • For wind generation control systems to work properly, a strong SCR is necessary

    • Synchronous condensers can provide improved system strength to mitigate the issues – but what should be the criteria for SCR for a bus and a region?

    • Criteria should apply to both Planning and Operations limits

  • Weighted short circuit ratio wscr
    Weighted Short Circuit Ratio (WSCR)

    • ERCOT staff has proposed a minimum Weighted Short Circuit Ratio (WSCR) of 1.5 for the Panhandle region

      • WSCR would become a default minimum criteria – but not proposed as a Protocol or Planning Guide requirement

      • There are no known WSCR minimums elsewhere - Also important to differentiate between WSCR and the SCR requirements at the POI for turbine vendors

    • Sharyland utilized a Composite Short Circuit Ratio (CSCR) approach to evaluate “optimal” amount of synchronous condensers required for in the Panhandle

      • Both CSCR and WSCR approaches observed to yield similar results

      • Sharyland deems it important to investigate the “technical basis/justification” for the WSCR threshold – synchronous condenser requirements are very sensitive to the target

      • Using results from system strength studies performed by Sharyland, a target of 1.2 for CSCR/WSCR seems appropriate maintain control stability and 3 GW of wind exports do not require Synchronous Condensers

      • Using a 1.5 CSCR/WSCR requires 250 MW of Synchronous Condensers at 3 GW of wind exports

    Proposal for ros consideration
    Proposal for ROS Consideration

    • ROS to assign a working group to address the following:

      • Review the WSCR methodology developed by ERCOT

      • Determine the appropriate target/criteria for minimum POI SCR and Regional WSCR