1 / 13

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?

calvin-fulton
Download Presentation

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

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  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

More Related