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Efficient Non-Spin Deployment Guidelines for Grid Stability

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mboutwell
8 diapositives · 115 Views · Dec 19, 2019

Guidelines for deploying Non-Spin Resources efficiently to maintain grid stability and recover capacity losses. Includes criteria, issues, and solutions for smooth deployment processes.

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Efficient Non-Spin Deployment Guidelines for Grid Stability
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  1. Non-Spin Deployment Resmi Surendran

  2. RUC Awarded Ancillary Service • Bring Resources On-Line if awarding REG or RRS • When awarding Non-Spin • First award to Non-Spin qualified Resources which have a lead time less than 30 mins and let them stay offline • The QSE will get RUC makewhole payment if they come online due to NSRS deployment • The QSE can file a dispute to recover any losses due to fuel purchased at a higher price and sold at a loss if they didn’t get a Non-Spin deployment • If there are not enough resources with lead time less than 30 mins and then award to other Non-Spin qualified Resources for hours that can satisfy its lead time and then ask them to come On-Line with Non-Spin Schedule & Responsibility = HSL-LSL • The QSE will get RUC makewhole payment due to them being online.

  3. Possible Deployment Criteria • When (HDL – Gen) ≤ 200 MW and (HASL – Gen) – (30-minute load ramp) < 500 MW-> deploy all • When (HDL – Gen) ≤ 200 MW and (HASL – Gen) – (30-minute load ramp) < 1000 MW -> deploy half • When PRC ≤ 2500 MW - deploy enough to recover PRC • When PRC ≤ 2300 MW -> deploy all • To recall deployed RRS when enough capacity is not available to SCED • If the North-to-Houston (N_H) Voltage Stability Limit <=300 MW -> deploy in the Houston area to restore reliability margin

  4. Partial Deployments • ERCOT is looking into possibility of more granular deployments • to deploy based on the immediate need • to give time for market to respond to scarcity • to reduce the amount of LSL energy pumped into the system during Non-Spin deployments

  5. Issues with Partial Deployments • Can not enable sending deployment instruction at the beginning of the hour • Deployment is currently based on telemetry • Resources could change responsibility every hour • 30 min ramping period at the beginning of an hour could cause spinning capacity not available when Resource go offline and come online due to change in Non-Spin Responsibility

  6. Short Term Solution • Don’t enable sending deployment instruction at the beginning of the hour and deploy full • Send out a message to all MPs on the Notice Builder when ERCOT deploys Non-Spin. • Ensure that QSEs are aware of Non-Spin deployment • QSEs can better manage their portfolio and work on getting the offline Resources online in time if needed to ensure continuity of services provided • For Resources that didn’t have Non-Spin Responsibility at the time of deployment and have new responsibility for some of the future hours in the deployment window

  7. Long Term Solution Options • Make hourly autosend based on COP Non-Spin Responsibility and send it out 30 minutes before the beginning of the hour. i.e. QSEs won’t be able to change Non-Spin Responsibility in RT if Non-Spin is deployed • Deploy based on telemetered Non-Spin Responsibility and change protocol to require QSEs to keep the OFFNS Resources On-Line at least one more hour after the responsibility ends when Non-Spin is deployed • Change protocol to require QSEs to make Non-Spin capacity available from a Resource to SCED, irrespective of the Resource’s Non-Spin Responsibility, from the time the Resource get Non-Spin deployment until all of the Non-Spin deployment is recalled from the system (Similar to RRS performance requirement from UFR)

  8. Questions?