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Enhancing Houston Grid Stability: WAP Split Option 4 Review

In February, CenterPoint Energy proposed a project to add dynamic reactive compensation in Houston for ERCOT review. A study revealed a fault issue causing load to trip, with a $125 million project estimated. ERCOT validated results, explored alternatives, and endorsed the cost-effective WAP Split Option 4. The split scheme mitigates risks and is set to resolve stability concerns, reclassified as Tier 2 due to lower costs. For more details, refer to the RPG report dated March 12, 2010.

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Enhancing Houston Grid Stability: WAP Split Option 4 Review

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  1. ERCOT Independent Review:CenterPoint Energy Houston Dynamic Reactive Project Jeff Billo RPG

  2. Background • In February CenterPoint Energy submitted a project to install additional dynamic reactive compensation in the Houston area for RPG review • Issue: • 3-phase fault with delayed clearing (NERC Category D contingency) at multiple stations causes ~4000-5000 MW of load to trip on UVLS and generator terminal voltages to remain below 0.90 pu for >10 seconds • Project estimated to cost $125 million RPG

  3. ERCOT Independent Review • ERCOT verified CenterPoint Energy results • ERCOT worked with CenterPoint Energy to explore several project alternatives including: • Limiting import into Houston area • In order to meet criteria the import amount had to be significantly constrained below the study case level and only one generator dispatch combination produced acceptable results • Considered not feasible • Installing Single-phase, independently operated breakers • Would reduce but not eliminate the probability of 3-phase fault with delayed clearing • CenterPoint Energy would still consider 3-phase fault possible due to the fact that a potential common mode failure could still exist • Splitting buses in the Houston area • Decouple the system to limit impact of nearby faults • Multiple bus splits studied • “Split Option 4” of the W. A. Parish 345 kV station found to produce the best results from steady-state and stability studies RPG

  4. WAP Split Option 4 RPG

  5. WAP Split Option 4 RPG

  6. WAP Split Option 4 • Cost estimate: $11 million • Significant capital cost savings (> $100 million) • Will require outages at WAP 345 kV station • CenterPoint Energy has created preliminary outage plan which has been reviewed by ERCOT Outage Scheduling Department • Steady-state analysis (AC contingency analysis and UPLAN simulation) performed • Not expected to result in additional congestion under normal conditions after construction • Stability analysis performed • Expected to resolve initial stability concern well into the future • Conclusions: • ERCOT Independent Review will endorse WAP Split 4 • ERCOT will reclassify project as Tier 2 due to lower capital cost RPG

  7. Questions/ Comments? March 12, 2010 RPG

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