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CREZ Reactive Study Update

CREZ Reactive Study Update. Dan Woodfin Director, System Planning. ERCOT CREZ Reactive Study Overview. ERCOT is facilitating CREZ TSP study being performed by ABB (see ABB’s March RPG presentation for background)

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CREZ Reactive Study Update

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  1. CREZ Reactive Study Update Dan Woodfin Director, System Planning RPG

  2. ERCOT CREZ Reactive Study Overview • ERCOT is facilitating CREZ TSP study being performed by ABB (see ABB’s March RPG presentation for background) http://www.ercot.com/content/meetings/rpg/keydocs/2010/0312/ABB_RPG_presentation.pdf • Four basic study elements • Reactive Compensation Requirements – series and shunt compensation • Subsynchronous Interactions (SSI) between wind generation and reactive compensation • Subsynchronous Resonance (SSR) between thermal generation and reactive compensation • Equipment Specifications RPG

  3. Reactive Requirements Study • Several situations must be studied, including: • Max Export (capacitive requirements) • Min Export (inductive requirements) • Peak Demand • Requires steady-state and dynamic stability analyses to be performed • The goal is to design a global reactive compensation strategy • Some intermediate resolutions: • Series Compensation remains 50% • Modification to connections at Tesla substation • Allow 1.1 per unit voltage on lines between substations for up to 30 minutes RPG

  4. Reactive Requirements Study • Reactive compensation strategy to determine dynamic reactive device (DRD) type, sizing and placement, based on analysis of critical contingencies • Initial dynamic simulations showed high frequency interactions between wind farm controls • Lack of sufficiently-strong synchronous current source, particularly in Panhandle • Use of synchronous condensers to meet a portion of the dynamic reactive requirement resolves issue to sufficient extent • Additional DRDs required • SVCs located at several 345kV CREZ stations • Some additional dynamic reactive support needed in DFW RPG

  5. Initial Build • The issue with wind farms being unable to operate where insufficient synchronous current source is available (low system strength) may be able to be resolved in several ways: • Increase system strength by installation of synchronous condensers, as noted above • Increased system strength with synchronous generation connected in the Panhandle or VFT ties • Require wind turbines designed to operate with a low short circuit ratio (to the extent feasible) • Others? • What solution is most efficient needs further discussion • Initial Build case proposed that would only install a portion of the DRDs initially • Based on level of wind generation supported by expected levels of fault current • Allows the market to explore efficient solution(s) RPG

  6. SSI/SSR • Further study has been awaiting reactive equipment study completion • Consideration of thyristor switched capacitors versus passive filters to minimize issues is on-going • Will share results with generators when complete RPG

  7. Questions? RPG

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