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Dynamic Reactive Support Project for Houston Area Substations

The CenterPoint Dynamic Reactive Support Project aims to enhance the reliability of the Houston area's electricity supply. Two substations in Bellaire and Crosby will be equipped with devices to maintain voltage within acceptable limits during severe contingencies. With a projected cost of $20–25 million, the project aims for completion by peak 2008. It addresses critical issues such as preventing over-frequency tripping, load shedding dynamics, and mitigating risks of cascading regional blackouts. Stakeholder reviews indicate strong support for this initiative.

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Dynamic Reactive Support Project for Houston Area Substations

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  1. CenterPoint Dynamic Reactive ProjectBoard of DirectorsAugust 15, 2006Bill BojorquezDirector, System Planning

  2. Description of Project • 2 Sites Selected: • - Bellaire • - Crosby • Estimated Cost $20 – 25 M for devices and all construction. • In-Service by Peak 2008. Installation of devices (type to be determined through RFP) to provide dynamic reactive support at two substations in the Houston area

  3. Project is Needed for Reliability Project is needed to: • Maintain voltage within acceptable limits following severe (NERC Category D) contingencies • Operating Guide 3.1.4.6, Protective Relaying Requirement • Maintain level of load shed following Category D contingencies to acceptable level • Limit the amount of load shedding to less than 1250 MW to avoid possible over frequency tripping, loss of significant local demand, and mitigate risk of cascading regional blackout

  4. Multiple Facility Forced Outages • ERCOT surveyed Transmission Operators to determine frequency of extreme events resulting in two or more components removed or cascading out or service – NERC Category D • Results Showed: • Average 19.71 events per year • Average 3.89 circuits removed per event • Average Time Between Events – 16.67 Days • Similar MAAC Data compiled by PPL Electric Utilities showed an average of 18.4 events per year with 2.4 to 2.6 circuits removed per event.

  5. Stakeholder Review • The Regional Planning Group stakeholder review period for this project was held in April 2006 • The project was presented to TAC at the August 3rd meeting • There have been no dissenting comments on this project through the RPG or at TAC

  6. ERCOT Support For the Project ERCOT staff recommends that the Board endorse the need for the CenterPoint Dynamic Reactive Support Project as described in the ERCOT report to the Board.

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