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CREZ Optimization Studies 765kV Schemes for 24+ GW Total Wind

CREZ Optimization Studies 765kV Schemes for 24+ GW Total Wind. Cathey Carter, PE RPG CREZ meeting 3/10/2008. Evaluating a Transmission Improvement Plan. Would it work? % total wind curtailment from UPlan Contingency analysis from PSS/E and MUST Could it be operated?

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CREZ Optimization Studies 765kV Schemes for 24+ GW Total Wind

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  1. CREZ Optimization Studies765kV Schemes for 24+ GW Total Wind Cathey Carter, PE RPG CREZ meeting 3/10/2008

  2. Evaluating a Transmission Improvement Plan • Would it work? • % total wind curtailment from UPlan • Contingency analysis from PSS/E and MUST • Could it be operated? • Voltage, transient, and angular stability analyses • Could it be built? • Professional judgment of the TDSP engineers • How much would it cost to build and operate in comparison to other plans? • Standard proxy prices were discussed and agreed to by this group last fall.

  3. The Tools • PSS/E • User sets up topology, loads, and generation dispatch • Program calculates voltages and power flows • Program does not consider economics • MUST • User sets up topology, loads, generation dispatch, contingencies, and transfer subsets • Program calculates contingency overloads and transfer limits between defined subsets • Program does not consider economics

  4. The Tools • UPlan • User sets up topology, load patterns, contingencies, and generation characteristics • Program models time series of real power flows and generation dispatches • Program is does not consider voltages and reactive power flows

  5. The Study: Distribution of Wind Generation and ERCOT Load

  6. Relative Distances from Wind Gen to ERCOT Load Please refer to pages 22-24 of Dr. Navin Bhatt’s presentation to the 9/28/2007 RPG CREZ meeting for the St. Clair Loadability Curve. This shows the decreasing line loading limit with increasing length per line voltage. The limit is a function of stability and voltage drop. Series compensation can reduce the voltage drop.

  7. The Study: Minimum Load and Minimum Dispatch 2012 ERCOT minimum load at 4/8 4AM 30,782 MW (+ losses) Minimum generation of 3 nukes 3,640 MW Difference = 27,142 MW Scenario 3 wind generation to study 24,859 MW Note: 24,859 / 27,142 = 91.6%

  8. The Study: 2012 Load Levels

  9. Methodology - Load • UPlan was used with Scenario 2 plans to choose several hours to study: • Maximum (Wind generation – west area load) • 4/2, 4AM Wind = 12,700 – 15,500 MW • Load = 33,845 MW • Maximum load • 8/2, 5PM Wind = 2,074 MW • Load = 78,630 MW • Minimum load and wind • 4/6, 5AM Wind = 2,062 MW • Load = 31,163 MW

  10. Methodology – Load, Generation • The 4/2 4AM load was advanced to the 2018 load for the same day and hour: 36,257 MW. • UPlan calculated the wind generation of the Scenario 2 “765kV Backbone” model at 4/2 4AM to be 12,700 MW, or about 70% of the 18,456 MW. • An AC model for Scenario 4 based on the 765kV backbone at 36,257 MW load can be considered “comparable” to the Scenario 2 plan when it is N-1 secure at wind generation = 17,093 MW, (70% of Scenario 4: 24,419 MW).

  11. Methodology – Generation • The rest of the generation in the AC models should be about 36,257 + Losses – 17,093. This is about 20 GW. • UPlan calculated the April capacity factor of all the non-wind generators for “unconstrained” conditions. They were ranked by CF and the first 20 GW were selected. • Pmin of all cogens was adjusted to 50% of Pmax, and Pmin of coal units was set to no higher than 50% of Pmax

  12. Comments Please direct comments to Warren Lasher or Cathey Carter. Warren: wlasher@ercot.com 512-248-6379 Cathey: ccarter@ercot.com 512-248-3978

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