WECC Phase 1 Rating Study TCWG

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Canada/Pacific Northwest to Northern California
Transmission ProjectWECC Phase 1 Rating Study
Update
PGE-Ben Morris/B Vijayraghavan/Sherman
Chen ABB-Shu Liu September24, 2008
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Order 2004 Sensitive
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New Transmission Projects Converging at Boardman
AreaPlanned Operation 2010 2015
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NW Study Activities

• Objective
• Determine which configuration option is the more
  effective in meeting identified PNW needs.
• Configurations
• Configuration A DC terminus at Echo
• Configuration B AC from Echo-Maupin -- DC
  terminus at Maupin
• Two Generation Scenarios
• Designed to stress the systemSouthbound (to
  California) and Westbound (to I-5)
• TCWG Update
• Develop Base Cases per configuration and
  generation scenario
• Share the base cases with TCWG members

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NW Study Activities

• Study Work
• 2015 HS Base Case (N-S)
• Thermal Studies Complete
• Conducting voltage stability analysis
• Over 300 Outages
• PNW single and double element outages
• CNC project single and double element outages

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Base case details
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Resource Dispatch Scenarios
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Configuration A -- Echo
To Selkirk Via Devils Gap
STA Z
Trans Canada HVDC
John Day
McNary
Big Eddy
Coyote Springs
Slatt
PCWA Walla Walla-Echo
Ostrander
PCWA Wallula-Echo
Bethel
Buckley
BPA McNary-Echo (loop existing line)
Boardman
Olallie
BPA Roundup-Echo (loop existing line)
HVDC 2000 MW
Echo Hub
PCWA Hermiston-Echo
HVDC 3000 MW
PGE- 1500 MW
IPC 1500 MW
Grizzly
East Of Cascades
Marion
Round Butte
West Of Cascades
PGE1600-3000 MW (HVDC)
Hemingway
Burns
To Bridger etc.
Malin
PCWA 1500 MW
Captain Jack
Meridian
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Base Case Modeling 15HS1 Case Alternative A
(Echo Substation) with HVDC at Echo

• Potential terminations at Echo Substation
• 500 kV
• BC/PNW-Northern California transmission project
  BC/PNW-Northern California transmission project
  Selkirk-Devils Gap-Echo 500 kV DCTL.
• BC/PNW-Northern California transmission project
  500 KV 3000 MW HVDC terminal.
• Idaho Power Project Boardman-Hemmingway 500 kV
  looped into Echo substation.
• BPA-McNary Station to Echo Substation. (This
  interconnection is not a sponsored project and
  is modeled only to study system performance based
  on Generation Scenario to be studied )
• 500/230 kV transformer bank.
• 230 kV
• PCWA- Walla-Walla- Echo line.
• PCWA- Wallula-Echo line
• Loop existing McNary-Roundup line.
• Hermstin-Echo line
• Other PNW Projects Modeled i
• BPA- WOGMIP project
• PGE Southern Crossing project Boardman Olallie
  -Bethel 500 kV HVAC
• PCWA Gateway West project Hemmingway- Captain
  Jack
• PCWA Gateway West project Hemmingway-Bridger 500
  kV DCTL

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Configuration B -- Maupin
Trans Canada HVDC
To Selkirk Via Devils Gap
Buckley
STA Z
John Day
McNary
Big Eddy
Coyote Springs
Ostrander
PCWA Walla Walla-Echo
Slatt
PCWA Wallula-Echo
Maupin Hub
Boardman
Bethel
BPA McNary-Echo (loop existing line
Echo Hub
PGE- 1500 MW
BPA Roundup-Echo (loop existing line
PCWA Hermiston-Echo
Olallie
IPC 1500 MW
PGE 3000MW (HVAC)
Grizzly
Marion
Round Butte
West Of Cascades
East Of Cascades
Hemingway
Burns
To Bridger etc.
Malin
PCWA 1500 MW
Dixonville
Captain Jack
Meridian
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Base Case Modeling 15HS1 Case Alternative B
(Echo, and Maupin ) with HVDC at Maupin

• Potential terminations at Echo Substation
• 500 kV
• BC/PNW-Northern California transmission project
  BC/PNW-Northern California transmission project
  Selkirk-Devils Gap-Echo 500 kV AC lines.
• BC/PNW-Northern California transmission project
  BC/PNW-Northern California transmission project
  Echo- Maupin 500 kV AC lines.
• Idaho Power Project Boardman-Hemmingway 500 kV
  looped into Echo substation.
• BPA-McNary Station to Echo Substation. (This
  interconnection is not a sponsored project and
  is modeled only to study system performance based
  on Generation Scenario to be studied )
• 500/230 kV transformer bank.
• 230 kV
• PCWA- Walla-Walla- Echo line.
• PCWA- Wallula-Echo line.
• Loop existing McNary-Roundup line.
• Hermistin-Echo line.
• Potential terminations at Maupin Substation
• 500 kV
• BC/PNW-Northern California transmission project
  BC/PNW-Northern California transmission project
  Echo- Maupin 500 kV AC lines.
• BC/PNW-Northern California transmission project
  500 KV 3000 MW HVDC terminal
• BPA- Loop existing Ashe-Marion and Buckley Marion
  500 kV lines at Maupin.
• Southern Crossing project Loop Boardman-Olallie
  500 KV line at Maupin

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Major Path Flow
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Contingency Performance for PNW Outage

• ABB-Shu Liu

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Study Cases

• Echo GS1
• 2015 Heavy Summer Project Base Case with CNC
  project Interconnection at Echo.
  BC(3000MW)NWR1(2500MW)/R2(1000MW)
• Echo GS2
• 2015 Heavy Summer Project Base Case with CNC
  project Interconnection at Echo.
  BC(3000MW)NWR2(1000MW)/R3(2500MW)
• Maupin GS1
• 2015 Heavy Summer Project Base Case with CNC
  project Interconnection at Maupin.
  BC(3000MW)NWR1(2500MW)/R2(1000MW)
• Maupin GS2
• 2015 Heavy Summer Project Base Case with CNC
  project Interconnection at Maupin.
  BC(3000MW)NWR2(1000MW)/R3(2500MW)

• NWR1 Little Goose/Walla Walla
• NWR2 Boardman, Slatt/Olallie
• NWR3 Rockcreek/John Day

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Study Methodology and Assumptions

• Contingency
• BPA Contingency List
• Contingencies associated with CNC project
• Monitoring Setting
• NORTHWEST (Area 40)
• PGE (Area 30)
• IDAHO (Area 60)
• SOCALIF (Area 24)
• Interfaces
• Contingency Solution Options
• Disable Switched Shunt Control
• Allow LTC Transformer Control
• Disable Phase Shifter Control
• Make-up Power Generator Participation Factor

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Results Facility Overloads
Order 2004 Sensitive
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Contingency Analysis (BPA Contingency List)
Northwest 115-kV system shows overloads
following some local contingencies.
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Contingency Analysis (BPA Contingency List)
Northwest 115-kV system shows overloads
following some local contingencies.
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Contingency Analysis (BPA Contingency List)
Only the worst contingency scenarios are shown
here.
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Contingency Analysis (CNC Project Contingency)

• Echo Option
• Bipole DC Outage (RAS Drop 3000 MW BC
  Generation)
• Devils Gap - Echo 500 kV Line (RAS Drop 3000 MW
  BC Generation)
• Selkirk - Devils Gap 500 kV Line (RAS Drop 3000
  MW BC Generation)
• Coyote Spring - Boardman Plant 500 kV Line
• Echo 500/230 kV Transformer
• Echo - Coyote Spring 500 kV Line
• Echo - Hemingway 500 kV Line
• Echo - McNary 500 kV Line
• Maupin Option
• Contingencies for Echo Option
• Echo - Maupin 500 kV Line (RAS Drop 3000 MW BC
  Generation)
• Maupin - Buckley AND Maupin - Ashe 500 kV Lines
• Maupin - Marion ckt 12 500 kV Lines

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Contingency Analysis (CNC Project Contingency)
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General Findings

• Many problems occur along the I-5 Corridor to
  effect e-w transfers for GS1 and GS2
• A fewer number of facilities are impacted with
  the Echo configuration
• Overloads are generally 3-6 lower on West of
  McNary facilities for the Echo configuration
• Previous studies of Olallie (similar to Maupin)
  and Boardman (similar to Echo) without the other
  projects modeled showed even better performance
  for Boardman (Echo option)

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• Phase 1 Studies

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Modeling Options for Phase 1 Studies

• Phase 1 Studies must model more than just the
  line to Canada
• means the rating for the Line to Canada could be
  viewed as dependent upon the construction of
  many projects
• Modeling Options for Echo
• Model only the Line to Canada -- not feasible
• Model Line to Canada plus McNary-Echo
  BoardmanCoyoteEcho (IPC, PGE, AVISTA)
• Provides sufficient Short Circuit Duty
• Minimum construction but involves an unsponsored
  project (McNary-Echo)
• Model Line to Canada plus Hemmingway-Echo (IPC)
  BoardmanCoyoteEcho (IPC, PGE, AVISTA)
• Provides sufficient Short Circuit Duty
• Model Line to Canada plus all projects currently
  proposed for the Echo area -- rating could be
  viewed as dependent upon the construction of many
  projects

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Modeling Options for Phase 1 Studies (contd)

• Modeling Options for Maupin-- would require
  modeling for Echo described above and the
  following
• Model only the Line to Canada -- not feasible
• Model Line to Canada plus loop the
  Boardman-Olallie line (PGE) into Maupin
• Model Line to Canada plus loop the AsheMarion
  and the Buckley-Marion lines (BPA) into Maupin

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Recommendation for Phase 1 Rating Studies

• Proposed Plan of Service
• SelkirkDevils Gap-Echo 500 kV AC double
  circuit
• EchoCollinsville /- 500 kV DC bipole with
  third terminal at Cottonwood
• Collinsville-Tracy 500 kV AC single circuit
• Echo Modeling
• Option 3 Model Line to Canada plus
  Hemmingway-Echo (IPC) BoardmanCoyoteEcho
  (IPC, PGE, AVISTA)

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Next Steps
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