2002/03 sema/ri export and short-term upgrade analysis
DESCRIPTION
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. - PowerPoint PPT PresentationTRANSCRIPT
2002/03 SEMA/RI Export and Short-Term Upgrade Analysis
Tuesday, February 4, 2003
SEMA
SEMA / RI EXPORT SEMA / RI EXPORT
SEMAGRI
VERMONT
NH
WESTERN MASS
CONNECTICUT
SWCTNORWALK-STAMFORD
SEMARI
LINE 336
CENTRAL MASS
COMERFORD MOORE
DOWNTOWN BOSTON
BOSTON
NEMA
SOUTHERN MAINE
BHE
MAINE
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
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.
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
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)
140 141 141A 142
143
L347 to Lake Road
Ocean State Power
L328 to W. Farnum
L3361 to ANP Blackstone
Sherman Road Substation
L333
314
1402
302
343
4357
L323 to W. Medway
L343 to Sandy Pond
L357 to W. MedwayL301/302 to Carpenter Hill and Ludlow
L314 to Sandy Pond
Millbury Substation
111 112
107 108 109
104 105 106
101 102A 102 103
L389 to W. Walpole
L325 to W. Walpole
L344 to Bridgewater
L3520 to ANP BellinghamL336 to ANP Blackstone
L357 to Millbury
L323 to Millbury
240-601 to Framingham Auto
W. Medway Substation
282-602 to Waltham Auto
107 108 109
104 105
L389 to W. Medway
L331 to Carver
L316 to HolbrookL25 to W. Medway
W. Walpole Substation
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
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
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
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.
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