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ERCOT Dynamic Ratings Application

ERCOT Dynamic Ratings Application. Wholesale Market Subcommittee April 12, 2012. Background. Transmission companies have the option to provide a table of ambient temperature-adjusted line ratings in the ERCOT Network Operations Model

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ERCOT Dynamic Ratings Application

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  1. ERCOT Dynamic Ratings Application Wholesale Market Subcommittee April 12, 2012

  2. Background • Transmission companies have the option to provide a table of ambient temperature-adjusted line ratings in the ERCOT Network Operations Model • ERCOT systems utilize these tables, along with the Weather Forecast to generate ratings for Real-Time and future studies, including • Congestion Revenue Rights (CRR) • Day-Ahead Market (DAM) • Reliability Unit Commitment (RUC) • Real-Time (SCED) • Note that not all transmission lines are, or have to be, dynamically rated

  3. How Are Dynamic Ratings Implemented? • CRR • Monthly Auction: Forecasted maximum on-peak temperature • Long-Term Auction Sequence: 10-Year historical on-peak average maximum temperature • DAM/DRUC/Operational Studies • Weather Forecast • HRUC • Real-Time ratings for first hour; Weather Forecast for future hours • SCED • Real-Time temperatures (by Load Area), or • Telemetry (Amps, MVA, local temperature)

  4. How Are Dynamic Ratings Implemented? • How often do the ratings change? • Telemetry • Can be updated in Real-Time • Ratings can change with each State Estimator execution • Typically once every five minutes • Weather Forecast • The Weather Forecast updates automatically every hour • With every State Estimator execution, the Weather Forecast is queried to ensure the proper ratings are considered

  5. Dynamic Rating Example

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