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CREZ Panhandle Study Update Sharyland Utilities. May 20, 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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CREZ Panhandle Study Update Sharyland Utilities


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    1. CREZ Panhandle Study UpdateSharyland Utilities May 20, 2014

    2. Background 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 • Completing steady state voltage security, transient voltage stability and system strength assessments for the Panhandle region with updated generation models • Including the trigger levels identified in the ERCOT PREZ study report • Evaluating the assumptions of the 2400 MW Panhandle export limit and the corresponding 2,160 MW used in the ERCOT economic study

    3. Preliminary Sharyland Study Conclusions • Based on updated WGR locations and sizes (that meet Section 6.9 of the ERCOT Planning Guides), no stability concerns were observed for 3,263 MW • Under 2014 case simulations the as-is CREZ transmission system observed to be able to accommodate 3,263MW of WGR capacity meeting Section 6.9 of ERCOT Planning Guide • No concerns observed from a steady state voltage security, voltage stability and/or system strength standpoint (no control instability or sustained oscillations) • Sharyland utilized a Composite Short Circuit Ratio (CSCR) approach to evaluate “optimal” amount of SCs required for conditions studied • Comparative analysis performed between the CSCR & ERCOT’s proposed WSCR approach – both approaches observed to yield similar results • Sharyland deems it important to investigate the “technical basis/justification” for the WSCR threshold – SC requirements are very sensitive to the target • Also important to differentiate between WSCR and the SCR requirements at the POI for turbine vendors

    4. Preliminary Sharyland Study Conclusions • Under 2015 system conditions, Sharyland finds the 2nd circuit along with properly sized and placed condensers provide adequate support for 4,545 MW (units meeting Section 6.9 & signed IAs with COD of 2014/15). • The 2nd circuit addition observed to be the “common requirement” from a voltage stability perspective • SCs provide limited incremental voltage support benefit – system strength key driver for SC sizing • Sharyland performed optimization studies for the best locations for SCs • 250 MVAr of SCs at two Sharyland substations, along with 2nd circuit, perform adequately for 4,545 MW of Panhandle exports • Results corroborated by dynamic simulations also • Prior loss of an SC followed by an ERCOT N-1 event results in control instability for the loss of large SC devices – not an issue with modular SCs

    5. Panhandle WGRs meeting Section 6.9 of ERCOT Planning Guide (May 2014)

    6. WGR Survey • Sharyland surveyed generation developers asking for updated phasing and commercial operation schedules for their panhandle wind projects • SGIA commercial operations dates (COD) were used for wind projects connected to WETT and CTT • Survey results below are for units that have met Planning Guide 6.9 requirements

    7. Dynamic Simulation Study Scenarios Scenario Definitions, Dynamic Simulations – SU Panhandle Assessment

    8. Dynamic Simulation Results Dynamic Simulations Results Summary – SU Panhandle Assessment

    9. Questions ?