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Frequency Overshoot Study and RRS Impacts in ERCOT: Analyzing Preliminary Draft Study Results

This study discusses the impact of frequency overshoot in the Southern Cross Transmission system and its effects on ERCOT. It explores different scenarios and evaluates the response of the frequency when tripping the SC/DC Tie Export at 2,100 MW. The initial draft results highlight the need to impose a limit on SC/DC Tie Export and simulate RRS case studies. The study also explores the effects of increasing the RCC and critical inertia on ERCOT's current RRS mix. Interpolated PFR and LR/PFR equivalency ratios are analyzed as well. Overall, this preliminary draft study emphasizes the need for further research and raises important questions.

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Frequency Overshoot Study and RRS Impacts in ERCOT: Analyzing Preliminary Draft Study Results

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  1. Southern Cross Transmission - Directive 9 - Discuss Frequency Overshoot Study and RRS impacts ERCOT Staff Draft Study Results

  2. Preliminary Draft Scenarios Used for Frequency Overshoot Study Draft Study Results

  3. Frequency Response when Tripping SC DC Tie Export at 2,100 MW Preliminary Draft Draft Study Results

  4. Limit Imposed on SC DC Tie Export Preliminary Draft Draft Study Results

  5. Preliminary Draft Simulated RRS Case Study *Case 1 : With RCC increased to 3,375 MW, ERCOT’s critical inertia goes up to around 130 GW*s. As a result, current RRS mix is insufficient to arrest system frequency above 59.4 Hz. Therefore, for the case with 130 GW*s inertia, LRs’ response time are shortened to 15 cycles to improve frequency nadir. Draft Study Results

  6. Interpolated PFR (No LR) Quantities Preliminary Draft *Note: With RCC increased to 3,375 MW, ERCOT’s critical inertia becomes 130 GW·s. As a result, current RRS mix is insufficient to arrest system frequency above 59.4 Hz. Therefore, for the case with 130 GW·s inertia, LRs’ response time are shortened to 15 cycles to improve frequency nadir. PFR quantity related to 130 GW·s is not included for interpolation. Draft Study Results

  7. Interpolated LR/PFR Equivalency Ratio Preliminary Draft *Note: With RCC increased to 3,375 MW, ERCOT’s critical inertia becomes 130 GW·s. As a result, current RRS mix is insufficient to arrest system frequency above 59.4 Hz. Therefore, for the case with 130 GW·s inertia, LRs’ response time are shortened to 15 cycles to improve frequency nadir. PFR quantity related to 130 GW·s is not included for interpolation. Draft Study Results

  8. Interpolated RRS Quantities Preliminary Draft *Note: With RCC increased to 3,375 MW, ERCOT’s critical inertia becomes 130 GW·s. As a result, current RRS mix is insufficient to arrest system frequency above 59.4 Hz. Therefore, for the case with 130 GW·s inertia, LRs’ response time are shortened to 15 cycles to improve frequency nadir. PFR quantity related to 130 GW·s is not included for interpolation. Draft Study Results

  9. Preliminary Draft RRS Quantity Increase Draft Study Results

  10. Questions?

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