I-5 Corridor Reinforcement Project .

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I-5 Corridor Reinforcement Project. Plan of Service ColumbiaGrid Regional Review July 12th, 2007. I-5Corridor. Introduction. The I-5 Corridor extends through BPA’s system from Canada to the border of California and Oregon and is a major north to south transmission path through BPA’s system.
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I-5 Corridor Reinforcement Project Plan of Service ColumbiaGrid Regional Review July twelfth, 2007

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Introduction The I-5 Corridor stretches out through BPA\'s framework from Canada to the outskirt of California and Oregon and is a noteworthy north to south transmission way through BPA\'s framework. The Tacoma, Southwest Washington, and Northwest Oregon stack ranges are served by the I-5 Corridor fundamental matrix transmission framework. As of now the I-5 Corridor is one of BPA\'s most congested ways with the most elevated stacking amid pinnacle summer stack conditions consolidated with high north to south exchanges through the northwest from Canada to California.

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Problem Description Under high north to south stream conditions basic 500kV line blackouts can bring about voltage flimsiness and over-burdens on the fundamental 230 and 115 kV frameworks. The present practice to moderate these issues is to utilize a therapeutic activity conspire (RAS) to trek enter era in the Northwest and Canada to lessen moves through the I-5 passage. In case of any of these blackouts as much as 2700MW of era can be dropped.

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Project Purpose The motivation behind the proposed plan of administration is to address the accompanying: Transmission benefit demands (Long-term) There are various demands in the line which influence the I-5 Corridor Generation interconnection asks for Currently there are a few proposed new producing ventures that affect the I-5 passage transmission framework. These ventures are situated amongst Satsop and Longview and have a consolidated limit of 1476MW. Expanding summer top burdens and the current legally binding commitments to serve them Reduce reliance on existing RAS while keeping up transmission framework unwavering quality

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Study Assumptions Base cases to be utilized BPA\'s pinnacle summer stack spending base cases The years 2008 (close term) and 2012 (long haul) were concentrated on Generation levels (greatest yield utilized as a part of studies) Chehalis Power Project 520MW (PGE) Beaver 492MW (Clark) River Road 235MW (PACW) Swift 210MW (PACW) Yale and Merwin 130MW (PGE) Port Westward 388MW Mint Farm 248MW (Grays Harbor) Satsop 628MW (Pacific Mountain Energy Center) Kalama 600MW Levels considered for basic cut planes/interties influencing the region: Canada-Northwest 2000 to 2850 MW California-Oregon Intertie 3300 to 4800 MW North of John Day 7000 to 8400 MW

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Study Assumptions Area loads estimated for summer 2008 PGE West Metro = 1980MW East Metro = 1317MW PAC Portland territory = 465MW Clark County = 659MW Thermal cutoff points of basic gear (summer appraisals at 30° C surrounding temp) Chehalis-Longview #1 and #3 230kV lines, 1840Amps to tap; 1070Amps exclusively Holcomb-Naselle 115kV line, 430Amps Ross-Woodland 230kV line, 1070Amps Longview-Lexington 230kV line, 1070Amps Trojan-St. Mary\'s 230kV line, 1315Amps Merwin-St. John\'s 115kV line, 673Amps Keeler-St. Mary\'s 230kV line, 1757Amps

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Study Assumptions Remedial Action Scheme (RAS) The greatest permissible era dropping for RAS was constrained to 2700MW for these studies RAS era dropping need depended on viability as takes after: Available I-5 Corridor era: Chehalis, Big Hanaford, Fredrickson, and new era as relevant BC Hydro: Revelstoke and MCA Upper Columbia: Grand Coulee and Chief Joseph BC Hydro era furnishing Defined by the condition 1.5*(IC-800), IC = the Ingledow-Custer stream Generation dropping at BC Hydro was restricted to a most extreme of 1850MW. Dropping the era is a "win big or bust" plan. In this study it was accepted that if the whole of the I-5 and BC Hydro era furnished surpassed the greatest RAS point of confinement of 2700MW, then era at BC Hydro would not be dropped. Creating units at Upper Columbia would be dropped. South of Chehalis Sectionalizing Scheme (SOCSS) Opens the Chehalis-Longview 230kV and Holcomb-Naselle 115kV lines in case of an over-burden taking after a Paul hallway 500kV twofold line misfortune. This plan is furnished, notwithstanding generator dropping, when pre-possibility streams are high on the South of Napavine way.

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Study Methodology Critical blackout List N-1 Allston-Keeler 500kV line Keeler-Pearl 500kV line N-2 Double line loss of Paul-Allston and Paul-Napavine 500kV lines Double line loss of Paul-Allston and Napavine-Allston 500kV lines Line blame and 500kV breaker disappointment possibility (4283) at Pearl (Keeler-Pearl-Ostrander 500kV) Line blame and 500kV breaker disappointment possibility (4394) at Keeler (Allston-Keeler-Pearl 500kV) Line blame and 500kV breaker disappointment possibility (4502) at Allston (Napavine-Allston-Keeler 500kV) Double line loss of Allston-Trojan #1 and #2 230kV lines Double line loss of St.Marys-Trojan and Rivergate-Trojan 230kV lines

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Study Methodology Generation design advancement South of Napavine, South of Allston, and Keeler-Pearl way limit differs with nearby load and era designs. BPA\'s Operations regularly works the I-5 hallway inside scope of points of confinement decided from studies where various era examples are considered. The study philosophy uncovered diverse issues happening under various framework conditions. The arrangement of generators utilized as a part of this study included existing plants and the accompanying ventures which influence the I-5 Corridor: Mint Farm, Grays Harbor, and Pacific Mountain Energy Center.

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Study Methodology

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Study Methodology SCADA information was gathered for the Willamette Valley/Southwest Washington stack benefit zone and Allston-Keeler 500kV line streams to decide era designs well on the way to happen under pinnacle load and high north to south streams. The most restricting era designs which are probably going to happen amid pinnacle summer stack conditions joined with high north to south courses through the I-5 hall are: Patterns G0, G2, G5, G8, G16, and G24 In these examples, the greater part of the I-5 Corridor era was on-line. The conclusion is that most I-5 era is on-line when the WILSWA territory load is cresting in the late spring and Allston-Keeler 500kV line streams are high.

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Study Methodology Generation design G2

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Study Methodology Reliability Criteria/Planning Standards Thermal Limit Criteria: All lines may not surpass their warm cutoff for all conditions. Transformers may not surpass their warm evaluating for all lines in administration conditions and may not surpass their crisis rating under blackout conditions. Voltage Limit Criteria: For all lines in administration, keep up at least 1.0 for each unit voltage and 0.95 for every unit or appropriate voltage for blackout conditions. Voltage Stability Methodology: Generation on low-side voltage control Capacitor bunches bolted from exchanging (chose 500kV shunt capacitor gatherings were exchanged amid the possibility) Transformer taps bolted SVCs permitted to change The genuine power edge criteria were connected utilizing the QV Analysis apparatus as a part of Power World. QV bends were developed at different exchange levels close to a warm point of confinement situation. The voltage solidness breaking point was resolved from the exchange or way stream level with zero edge.

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Existing System Performance In the accompanying examination of the current framework execution, the pinnacle summer 2008 base case burdens were utilized. As an aftereffect without bounds stack levels utilized, the South of Napavine and the South of Allston way TTC decided from the studies is lower than the current posted TTC and not exactly the way limit sold. This is because of the distinction in how the TTC is resolved between this arranging study and the studies used to set working points of confinement. The posted TTC levels were set utilizing a WECC summer 2005 working case. In the working case burdens were demonstrated at 95 percent of pinnacle. The working studies display conditions more probable seen on the framework amid high north to south exchanges. This arranging study models crest future burdens (2008) happening at the same time with high exchanges. The nearby loads influence the streams along the I-5 Corridor and, in this manner, influence the inward way TTC. Thus, higher loads in the Portland and Vancouver stack focuses will diminish South of Napavine and South of Allston TTC, as this study appears.

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I-5 Corridor Internal Paths Within the administration zone, four huge ways are observed to guarantee the framework is worked inside safe breaking points. These ways are portrayed underneath: Raver-Paul Raver-Paul 500kV line evaluated at 2900Amp limit, 30 °C Ambient South of Napavine 500kV Paul-Allston #2 500kV line at 3260Amp limit, 30 °C Ambient Napavine-Allston (Paul-Allston #1) 500kV line at 3220Amp limit, 30 °C Ambient South of Allston-Keeler 500kV line at 3500Amp limit, 30 °C Ambient Trojan-St. Mary\'s 230kV line at 1315Amp limit, 30 °C Ambient Trojan-Rivergate 230kV line at 1315Amp limit, 30 °C Ambient Ross-Lexington 230kV line at 1070Amp limit, 30 °C Ambient Merwin-St. John\'s 115kV line at 673Amp limit, 30 °C Ambient Allston-St. Helens 115kV line at 850Amp limit, 30 °C Ambient Astoria-Seaside 115kV line at 502Amp limit, 30 °C Ambient Keeler-Pearl Keeler-Pearl 500kV line at 2590Amp limit, 30 °C Ambient

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South of Napavine Path

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South of Napavine Path Limiting Outage: The twofold line loss of Paul-Allston #1 and #2 500kV lines Limiting Elements: Chehalis-Longview #1 and #3 230kV lines Holcomb-Naselle 115kV line Existing South of Napavine way restrain 2250-2700 MW (with 2700MW RAS gen drop) South of Napavine way constrain from I-5 Corridor contemplate comes about Thermal cutoff points: 1830MW (G27) – 2320MW (G2) Voltage Stability: 2600MW (G31) – 2760MW (G0) with SOCSS actualized

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South of Allston Path

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South of Allston Path Limiting Outage: Line blame and Keeler 500kV breaker 4394 disappointment blackout creating the twofold line loss of the Allston-Keeler and Keeler-Pearl 500kV lines Additional blackouts: Allston-Keeler 5

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