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January 2005 CPS1 133.93

January 2005 CPS1 133.93. February 2005 CPS1 123.19. March 2005 CPS1 135.99. April 2005 CPS1 127.26. April 2005 CPS1 by Day. EROT CPS1 12 Month Rolling Average. Percent of Time on TEC. PRR 525 SCPS1. PRR 525 SCPS2. PDCWG Meeting April 28 & 29.

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January 2005 CPS1 133.93

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  1. January 2005 CPS1 133.93

  2. February 2005 CPS1 123.19

  3. March 2005 CPS1 135.99

  4. April 2005 CPS1 127.26

  5. April 2005 CPS1 by Day

  6. EROT CPS1 12 Month Rolling Average

  7. Percent of Time on TEC

  8. PRR 525 SCPS1

  9. PRR 525 SCPS2

  10. PDCWG Meeting April 28 & 29 • Speed Droop Testing/forms and graph of expected performance for DWG and OG • Reviewed 1str qtr Disturbances (7 events). • QSE performance reviewed • Governor Sustained response • Governor Adequate response • Governor Dead bands • QSE Bias Setting • Data latency • AGC Performance

  11. Droop Characteristic

  12. PDCWG Meeting, cont. • Post disturbance Frequency Control • Secondary frequency oscillation following system disturbances. • Identified Responsive Reserve recall ramp rate contributing to control problem. • Requested recall ramp rate to be reduced by one half. • ERCOT unable to adjust without impacting deployment ramp rate • Requested a SIR be submitted to allow adjustment of the recall ramp rate without impacting the deployment.

  13. NERC • Eastern Interconnect concerned about recent frequency control. • Western Interconnect developing a white paper on Frequency Response • PJM investigating Frequency Response product.

  14. Interconnection Frequency Comparison Southern Control Area: 6 second data April 22, 2005 at 07:20:24 AM CDT ERCOT Frequency – 2 second data May 18, 2004

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