Ontario Transmission System

1
Ontario Transmission System

• Presentation to FASC
• April 16, 2003

2
Ontario Transmission System- Highlights

• Nine major internal interfaces
• Ten transmission zones
• Eight interconnection points with Manitoba,
  Minnesota, Quebec, Michigan New York
• Generally, several transmission networks at 500
  kV, 230 kV and 115 kV voltage levels

3
Map of Ontario
4
Ontario Transmission System
NW
NE
Quebec
EWTW / EWTE
Quebec future HVDC
FN / FS
Bruce
Essa
Ottawa
FABC
Quebec
CLAN / CLAS
BLIP / NBLIP
FIO
Toronto
SW
East
West
Quebec
FETT
Niagara
NY Niagara
QFW
Lake Erie future HVDC
5
Definition of Interface/Interconnection

• Interface and Interconnection definitions are
  formed by grouping one or more circuits (lines)
  for the purpose of measuring their combined flow
  at specific points and enforcing a power flow
  limit in MW.

6
Major Interfaces

• East-West (EW) - EW Transfer East(EWTE) EW
  Transfer West (EWTW)
• Flow North (FN)/Flow South (FS)
• Claireville North (CLAN)/Claireville South (CLAS)
• Flow Away from Bruce Complex (FABC)
• Buchanan Longwood Input (BLIP)/Negative BLIP
  (NBLIP)
• Queenston Flow West (QFW)
• Flow East Towards Toronto (FETT)
• Transfer East from Cherrywood (TEC)
• Flow Into Ottawa (FIO)

7
Interface Limit Characteristics

• Base limit
• All transmission facilities are in-service
• Directional
• Certain outages result in a penalty in MW
• Respect thermal limitations
• Preserve system and/or plant stability and
  maintain acceptable post-contingency voltage
• Some limits simple constants others more complex

8
Interface Base Limits
9
EWTE/EWTW Interface

• Boundary between the NW and NE zones
• Power flows related to power flows with Manitoba
  Minnesota
• EWTE limit - 325 MW - preserve system stability
• EWTW limit - 350 MW - preserve system stability
  maintain acceptable pre-contingency voltages
• Power flows from NW to NE

10
FN/FS Interface

• Boundary between the NE and Essa zones
• FN limit - 1,900 MW - maintain acceptable
  post-contingency voltages
• FS limit - 1,400 MW - preserve plant stability

11
CLAN/CLAS Interface

• Boundary between the Essa and Toronto zones
• CLAN limit - 2,000 MW
• CLAS limit - 1,000 MW
• Limits define boundary conditions for other
  system limits

12
FABC Interface

• Boundary between the Bruce zone and the West and
  Southwest zones
• Flows are out
• FABC limit - 4,050-4,450 MW 4 units 4,440-4,950
  MW
  
  
  
  5 units 4,500-5,300
  MW 6 units
• Preserve system and/or plant stability maintain
  acceptable post-contingency voltages
• Limit improvement with generation rejection

13
BLIP/NBLIP Interface

• Boundary between the West zone and the Bruce and
  Southwest zones
• BLIP limit - 3,500 MW - preserve system and/or
  plant stability maintain acceptable
  pre-contingency and post-contingency voltages
• NBLIP limit - 1,500 MW - maintain acceptable
  post-contingency voltages
• NBLIP limit dependent on Bruce, Lambton
  Nanticoke and reactor switching availability

14
QFW Interface

• Boundary between the Niagara and SW zones
• QFW limit - 1,750 MW Summer 1,950 MW Winter -
  respect thermal limitations
• Real-time, limit determined by ambient weather
  conditions
• No limit for flows opposite to QFW direction

15
FETT Interface

• Boundary between the SW zone and the Essa and
  Toronto zones
• FETT Limit - 5,700 MW - preserve system and/or
  plant stability maintain acceptable voltages
• Limit dependent on Nanticoke, Lakeview,
  Darlington, Pickering Lennox plus FS flow
• Summer limit dependent on Ontario Demand
• No limit for flows opposite to FETT direction

16
TEC Interface

• Boundary between the Toronto and East zones
• No pre-defined limit

17
FIO Interface

• Boundary between the East and Ottawa transmission
  zones
• FIO Limit - 1,900 MW - maintain acceptable
  post-contingency voltages
• Real-time limit improvement with load rejection
• No limit for flows opposite to FIO direction
• Quebec High Voltage Direct Current (HVDC)
  interconnection project - limit increase to 3,000
  MW

18
Snapshot Flows Jan. 23, 2003 _at_ approx. 1800 hrs
NW
NE
Quebec
240 MW
Quebec future HVDC
615 MW
Bruce
Essa
Ottawa
3120 MW
Quebec
650 MW
215 MW
1470 MW
Toronto
SW
East
West
325 MW
Quebec
2925 MW
Niagara
NY Niagara
1010 MW
Lake Erie future HVDC
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Snapshot Flows Jan. 23, 2003 _at_ approx. 330 hrs
NW
NE
Quebec
50 MW
Quebec future HVDC
935 MW
Bruce
Essa
Ottawa
3115 MW
Quebec
1910 MW
255 MW
1245 MW
Toronto
SW
East
West
1775 MW
Quebec
3165 MW
Niagara
NY Niagara
315 MW
Lake Erie future HVDC
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Ontario Transmission System
NW
NE
Quebec
EWTW / EWTE
Quebec future HVDC
FN / FS
Bruce
Essa
Ottawa
FABC
Quebec
CLAN / CLAS
BLIP / NBLIP
FIO
Toronto
SW
East
West
Quebec
FETT
Niagara
NY Niagara
QFW
Lake Erie future HVDC
21
Interconnections

• Ontario-Manitoba - Ontario-Manitoba Transfer East
  (OMTE) Ontario-Manitoba Transfer West (OMTW)
• Ontario-Minnesota - Minnesota Power Flow North
  (MPFN) Minnesota Power Flow South (MPFS)
• Ontario-Michigan

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Interconnections(Continued)

• Ontario-New York Niagara Ontario-New York St
  Lawrence
• Ontario-Quebec North Ontario-Quebec South
• Quebec Lake Erie HVDCs (future installations)
• Most of Ontarios non-radial interconnections are
  under phase angle regulator (PAR) control, except
  for New York Niagara and part of Michigan (today)

23
Interconnection Limit Characteristics

• Base limit
• All transmission facilities are in-service
• Directional
• Certain outages result in a penalty in MW
• Manitoba Minnesota - PAR deadband margins
  recognized in limits
• Quebec - summer and winter limits

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Interconnection Limit Characteristics (Continued)

• Michigan New York - range of summer and winter
  flow limits
• Respect thermal and/or stability limitations
• Real-time, thermal limitations determined by
  ambient weather conditions
• Ontario coincident import/export capability -
  many factors

25
Interconnection Base Limits
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Ontario-Manitoba Ontario-Minnesota
Interconnections

• PAR controlled
• Imports exports constrained by stability and
  thermal limitations
• OMTW limit - 275 MW OMTE limit - 275 MW SK1
  115kV limit - 49MW
• MPFN limit - 90 MW MPFS limit - 140 MW

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Ontario-Quebec North Interconnection

• Radial connection
• Imports exports are constrained thermal
  limitations
• Summer limits - imports 65 MW exports 95 MW
• Winter limits - imports 84 MW exports 110 MW

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Ontario-Quebec South Interconnection

• Radial connection
• Imports are constrained by stability limitations
  and available Quebec generation
• Exports are constrained by stability and thermal
  limitations
• Summer limits - imports 1,385 MW exports 740 MW
• Winter limits - imports 1,385 MW exports 760 MW

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Ontario-New YorkSt. Lawrence Interconnection

• PAR controlled
• Imports exports are constrained by thermal
  limitations
• Limit - imports 400 MW exports 400 MW

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Ontario-New York Niagara Interconnection

• Free flowing
• Imports exports are comprised of scheduled
  flows plus unscheduled parallel path flows
• A range of flow limits for different weather and
  generation dispatch conditions
• Lower flow limit - unfavourable operating
  conditions constrained by thermal limitations

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Ontario-New York Niagara Interconnection
(Continued)

• Higher flow limit - favourable operating
  conditions constrained by thermal limitations
• Generally, import capability never fully utilized
• Summer limits - imports 1,000-1,300 MW exports
  700-1,800 MW
• Winter limits - imports 1,200-1,500 MW exports
  1,000-2,000 MW

32
Ontario-Michigan Interconnection

• Partial PAR control free flowing (today)
• Imports exports are comprised of scheduled
  flows plus unscheduled parallel path flows
• Full PAR control (Summer 2003)
• Imports exports are expected to more closely
  match scheduled flows
• Partial vs. full PAR control does not materially
  change the flow limits

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Ontario-Michigan Interconnection(Continued)

• A range of flow limits for different operating
  conditions
• Exports - lower flow limit - no generation
  rejection is armed at Lambton
• Imports - higher flow limit - low generation
  levels at Lambton and TransAlta - Sarnia
• Summer limits - imports 700-1,700 MW exports
  1,700-2,100 MW
• Winter limits - imports 1,200-1,700 MW exports
  1,800-2,200 MW

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Unscheduled Power Flow - Michigan-Ontario-New York

• Lake Erie Circulation (LEC) is an unscheduled
  parallel path flow involving Michigan, Ontario
  New York
• Occurs naturally
• Circulates through Ontario in a clockwise or
  counterclockwise direction
• Aggravates the BLIP and QFW interfaces
• Utilization of full PAR control at Michigan will
  control LEC in either direction to levels less
  than 600 MW

35
Scheduled Power Flow - Michigan-Ontario-New York

• With partial PAR control at Michigan (MI),
  scheduled power flows across the MI and New York
  (NY) Niagara interconnections depend on system
  conditions
• When full PAR at MI is utilized, scheduled power
  flows with MI are more likely to be regulated
  across the MI interconnection
• This will alleviate unscheduled flows on the NY
  Niagara interconnection and in turn, allow
  scheduled flows with New York to be maintained

36
NY - MichiganScheduled import example with
partial PAR control
Michigan flow 0.7 Michigan schedule 0.35 NY
schedule
NY flow 0.3 Michigan schedule 0.65
NY schedule
Beck Generation 1800 Niagara load 800 QFW
pre-load 1000 QFW limit 1750 permissible
inflow on NY interface 750
Michigan Import Limit 1700 Michigan Import
Schedule 1700 Michigan flow into Ontario
1190129
1319 Michigan contribution on NY 510
NY max additional import flow 750 - 510
240 NY max schedule 240 / 0.65 369 NY
contribution on Michigan 129 NY flow 750
Import from NY Michigan 1700 369 2069
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Ontario Coincident Import/Export Capability

• With partial PAR control at MI, the coincident
  import/export capability is unlikely to equal the
  arithmetic sum of the individual flow limits
• When full PAR control is utilized, the coincident
  import/export capability could equal the
  arithmetic sum of the individual flow limits

38
Ontario Coincident Import/Export Capability -
Range
39
Ontario Coincident Import/Export Capability -
Example
2,964 MW324(MB)90(MN)400(NY St. Lawrence)
65(QC North)1,385(QC South)700(min. MI
only) 3,964 MW32490400651,385700(min. MI)
1,000 (min. NY Niagara) 5,264 MW32490400651,
3851,700(max. MI) 1,300 (max. NY Niagara)
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Ontario Coincident Import Capability

• Higher value in ranges achieved with low
  generation dispatch levels
• Generation levels rarely, if ever, materialize
• Expected Ontario coincident import capability is
  approximately 4,000 MW

41
IMO Reports on Transmission Capacity

• Interface and interconnections limitations are
  identified in the IMO Security Status Report
  (SSR), Security and Adequacy Assessment Report
  (SAA) and 18-Month Outlook
• Different time periods covered
• Limitations identified as a penalty in MW
• Penalty is applied against the base limit

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Example - SSR Report for April 11, 2003
FETT Base limit5,700MW Limit5,700-150-3505,200
MW
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End