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2002/03 SEMA/RI Export and Short-Term Upgrade Analysis

2002/03 SEMA/RI Export and Short-Term Upgrade Analysis. Tuesday, February 4, 2003. SEMA. SEMA / RI EXPORT. SEMA. GRI. BHE. COMERFORD MOORE. MAINE. VERMONT. SOUTHERN MAINE. NH. NEMA. BOSTON. WESTERN MASS. DOWNTOWN BOSTON. CENTRAL MASS. LINE 336. CONNECTICUT. SEMA. RI. SWCT.

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2002/03 SEMA/RI Export and Short-Term Upgrade Analysis

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  1. 2002/03 SEMA/RI Export and Short-Term Upgrade Analysis Tuesday, February 4, 2003

  2. SEMA

  3. SEMA / RI EXPORT SEMA GRI

  4. BHE COMERFORD MOORE MAINE VERMONT SOUTHERN MAINE NH NEMA BOSTON WESTERN MASS DOWNTOWN BOSTON CENTRAL MASS LINE 336 CONNECTICUT SEMA RI SWCT NORWALK-STAMFORD

  5. Generation/Load • Generation Capacity in SEMA/RI • SEMA: 3633 MW (WSCC), 3350 MW (SSCC) • RI: 5890 MW (WSCC), 5414 MW (SSCC) • SEMA/RI: 9523 MW (WSCC), 8764 MW (SSCC) • Load • Year 2002 • SEMA: 2304 MW, RI: 2009 MW, • SEMA/RI: 4313 MW (17.8% of NEPOOL load) • Year 2003 (forecast) • SEMA: 2358 MW, RI: 2056 MW • SEMA/RI: 4414 MW

  6. Objectives • Determine a set of maximum concurrent transfers among SEMARI, SEMA and E-W • Investigate the sensitivities of E-W transfers based on different NY-NE transfers • Determine the short-term upgrades required to enhance the export capability.

  7. Criteria • This study concentrated on the system responses to extreme contingencies (3ph fault with delayed clearing) • System responses are unacceptable if • Transiently unstable, or • Transient stable with undamped oscillation, or • A net source loss over 1400 MW

  8. Recommendation – Stability Performance Analysis • Modify or replace the following breakers to achieve Independent Pole Tripping (IPT) capability: • West Medway 111, 112 (completed) • Millbury 314 (completed) • Sherman Road 142 (completed) • West Walpole 104, 105, 108, 109 (2003)

  9. L347 to Lake Road L3361 to ANP Blackstone 140 141 141A 142 143 L328 to W. Farnum L333 Ocean State Power Sherman Road Substation

  10. L314 to Sandy Pond L323 to W. Medway 314 343 L343 to Sandy Pond 1402 4357 L301/302 to Carpenter Hill and Ludlow 302 L357 to W. Medway Millbury Substation

  11. L389 to W. Walpole 282-602 to Waltham Auto 111 112 107 108 109 L325 to W. Walpole L323 to Millbury L357 to Millbury 104 105 106 L344 to Bridgewater 240-601 to Framingham Auto 101 102A 102 103 L3520 to ANP Bellingham L336 to ANP Blackstone W. Medway Substation

  12. L389 to W. Medway 107 108 109 L25 to W. Medway L316 to Holbrook 104 105 L331 to Carver W. Walpole Substation

  13. SEMA/RI Stability Limits • Before all the IPT modifications: • SEMA/RI 2400 MW • SEMA 400 MW • E-W 850 MW • The current stability limits (West Walpole non-IPT) • SEMA/RI 2400 MW • SEMA 1350 MW • E-W 850 MW • After all the IPT modifications • SEMA/RI 3000 MW • SEMA 2300 MW • E-W 2400 MW

  14. Impact of various NY-NE transfers on E-W stability limits • After the breaker upgrades, SEMARI 3000 MW, SEMA 2300 MW can be achieved simultaneous with • if NY-NE 1500 MW, then East-West 2700 MW • if NY-NE 0 MW, then East-West 2400 MW • if NY-NE -1200 MW, then East-West 1700 MW

  15. Canal Substation • Extreme contingencies at Canal substation cause a total source loss over 1400 MW (Canal unit 1 and 2, NB-NE tie trip) • Canal non-IPT breakers 212, 312, 412, 112, 512 and 612 • Upgrade breakers to meet IPT requirement or reduce the backup clearing time to achieve an acceptable system response

  16. Brayton Point substation • Non-IPT breaker 15-300T and 03-300T • Total source loss over 1400 MW • Upgrade or replace 15-300T and 03-300T to meet IPT requirement.

  17. Follow-Up Stability Analysis • Long-term transmission expansions are required to further increase the SEMARI transfer limits • Stability analysis of long-term alternatives is in progress right now

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