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CREZ Optimization Studies Scenario 2, Alternative 4: Low Impedance Backbone for Wind Connections

CREZ Optimization Studies Scenario 2, Alternative 4: Low Impedance Backbone for Wind Connections. Cathey Carter, PE RPG CREZ meeting 12/14/2007. Description . This solution starts with a transmission backbone between one central point and the three load centers.

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CREZ Optimization Studies Scenario 2, Alternative 4: Low Impedance Backbone for Wind Connections

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  1. CREZ Optimization StudiesScenario 2, Alternative 4:Low Impedance Backbone for Wind Connections Cathey Carter, PE RPG CREZ meeting 12/14/2007

  2. Description • This solution starts with a transmission backbone between one central point and the three load centers. • The central point is not connected to the existing network. • The endpoints are Zenith near Houston, Trinity between Dallas and Fort Worth, and West Gate outside Austin – San Antonio. • Each endpoint must be well developed to the local load-delivery network. • Additional substations can be installed any where on the lines to attach new generation.

  3. Goals • Reduce impedance and phase angles between the three heaviest load areas. • Provide a strong “target” for new transmission lines from large new generation sources. Any big generator could build to the closest part of the backbone. • Reduce loading on existing major paths.

  4. Other Possible Effects, Good and Bad • Improve dynamic stability? • Decrease loading on the biggest existing transmission paths. • Reduce nodal price differences among the load centers? • Possibly the maximum construction cost. • Likely public opposition along ROW, which is true for any new construction. • Will require upgrades of existing network for n-1 security.

  5. Current Status of Study = Incomplete Zenith Sub Connections: • 50 mile 765kV line to Bryan rated 6625 MVA • (2) 2100 MVA autos to 345kV system • (2) 345kV lines to O’Brien, each rated 1450 MVA • (2) 345kV lines to Singleton, each rated 1450 MVA • (2) 345kV lines to TH Wharton, each rated 1499 MVA

  6. Current Status of Study = Incomplete Bryan Sub Connections: • 50 mile 765kV line to Milam rated 6625 MVA • 50 mile 765kV line to Zenith rated 6625 MVA • (1) 2100 MVA 765-345kV auto, new 345kV bus • (1) 600 MVA 345-138kV auto, new 138kV bus • 10 miles 138kV line to BRYN_SWTCH rated 469 MVA • 10 mile 138kV line to BRYN_DSBY rated 469 MVA

  7. Current Status of Study = Incomplete Milam Sub Connections: • 50 mile 765kV line to Bryan rated 6625 MVA • 70 mile 765kV line to Corsicana rated 6625 MVA • 35 mile 765kV line to Mid rated 6625 MVA

  8. Current Status of Study = Incomplete Corsicana Sub Connections: • 70 mile 765kV line to Milam rated 6625 MVA • 75 mile 765kV line to Trinity rated 6625 MVA • (2) 2100 MVA autos to new 345kV bus at existing crossing of two transmission corridors • (2) 345kV lines to Venus rated 1072 MVA • (2) 345kV lines to Watermill rated 1631 MVA • (2) 345kV lines to Big Brown rated 1072 MVA • (2) 345kV lines to Limestone rated 1631 MVA

  9. Current Status of Study = Incomplete Trinity Sub Connections: • 75 mile 765kV line to Corsicana rated 6625 MVA • (2) 2100 MVA autos to new 345kV bus • (1) 345kV line to Benbrook rated 2988 MVA • (2) 345kV lines to Everman rated 2988 MVA • (2) 345kV lines to Liggett rated 2988 MVA • (1) 345kV line to Hicks rated 2988 MVA • (1) 345kV line to Saginaw rated 2988 MVA, plus (2) 800 MVA 345-138kV autos at Saginaw • (1) 600 MVA 345-138kV auto to existing Trinity 138kV bus

  10. Current Status of Study = Incomplete Mid Sub Connections: • 35 mile 765kV line to Milam rated 6625 MVA • 65 mile 765kV line to West Gate rated 6625 MVA • (2) 2100 MVA 765-345kV autos • (2) 345kV lines to Salado rated 1631 MVA • (1) 345kV line to Zorn rated 1630 MVA • (1) 345kV line to GILLE345 rated 1630 MVA • (1) 686 MVA 345-138kV auto

  11. Current Status of Study = Incomplete West Gate Sub Connections: • 65 mile 765kV line to Mid rated 6625 MVA • (2) 2100 MVA 765-345kV autos • (1) 345kV line to Red Creek rated 3000 MVA • (1) 345kV line to Willow rated 1959 MVA • (1) 345kV line to Gillespie rated 1959 MVA, plus (2) 800 MVA 345-138kV autos, and a 345kV line to Kendall also rated 1959 MVA • (1) 345kV line to Lampasas rated 1959, plus (2) 800 MVA 345-138kV autos

  12. Current Status of Study = Incomplete Other New Lines in the Model: • 32 mile 345kV Hicks-Willow • 2nd Willow – Jacksboro 345kV line on same towers • 2nd Oklaunion – Bowman 345kV line on separate ROW • 2nd 345kV Twin Buttes – Red Creek line, separate ROW • 20 mile 345kV Bitter Creek – Bluff Creek line • 130 mile 345kV Bluff Creek – Lampasas line • 30 mile 345kV Goat – Red Creek line • 130 mile 345kV Red Creek – West Gate line

  13. Current Status of Study = Incomplete Other Changes to the Model, not Lines: • 345kV ring bus at Paint Creek, not connected to anything else • All 69kV and 138kV lines between Abilene and Stephenville converted to short radials • Trinity 138kV buses connected. • (2) 345-138kV autos at IRV Valley Ranch • 138kV load and capbank moved from Hurst N to Hurst S • 69kV Seymour – Bomarton disconnected • 69kV Winters – Hatch disconnected • 345kV connection to Big Spring, and 138kV Midland East – Big Spring rebuilt for 469 MVA

  14. 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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