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Coordinating Controls across CREZ

What dials are available to the operators? What are the hand-offs between the ISO and TO? What does it take to implement controls in the field?. Coordinating Controls across CREZ. Reactive Resources Static vs Dynamic Inductive vs Capacitive Power Flow control Line switching

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Coordinating Controls across CREZ

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  1. What dials are available to the operators? What are the hand-offs between the ISO and TO? What does it take to implement controls in the field? Coordinating Controls across CREZ

  2. Reactive Resources Static vs Dynamic Inductive vs Capacitive Power Flow control Line switching Phase Shift Transformers Series Capacitors What dials are available to the operators?

  3. Syncro-Phasor Voltage (high wind production) Magnitude Angle Mid/Ods DFW Houston Valley Power Flow Generation

  4. Traditional Automatic Voltage Regulator with target kV Power Flow Controller with target MW Alternative Approach Reactive Reserve targets Real Power limits What are the hand-offs between the ISO and TO?

  5. What does it take to the implement controls? • Reserves • Local real and reactive systems must have head room to respond to disturbances • Anticipation • State Estimator predicts post-contingency conditions • Preemptive scheduling of set points, so that local control can regulate back into secure positions

  6. Definitions for Reactive Reserve Controller • DRCS • Dynamic Reactive Compensation System • Automation to control static and variable reactive power devices as an integral system • SSD • Static Shunt Device • Fixed capacitor or reactor bank

  7. DRCS Block Diagram – SVC/STATCOM

  8. SSD Controller Terms • VDRCS • Voltage on bus regulated by dynamic device • VSSD • Voltage on bus with SSDs • QDRCS • Reactive power output (± MVAR) of dynamic device • Increment • Increase reactive power to grid (e.g. close cap or trip reactor) • Decrement • Decrease reactive power to grid (e.g. trip cap or close reactor)

  9. SSD Controller Terms (continued) • Scheduled Voltage • Regulation setting for dynamic reactive device • Midpoint • Setting by operator for voltage or reactive power operation band • Bandwidth • Setting in the DRCS defining the high and low points of the band set

  10. QDRCS What Determines SSD Switching? • Dynamic reactive output (QDRCS) outside of operating band for a set time (typically minutes) Increment set

  11. SSD Switching Pattern in McCamey area • Three DRCSs at Crane, Rio Pecos and Friend Ranch operate locally to switch capacitors and reactors, compensating for reactive power consumption caused by intermittent power from wind

  12. Implementation of Real Power Controllers • Phase Shift Transformers • Bandwidth control around a set point • Series Capacitors • Bypass controller based on target range of power flow

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