IMO Transmission Assessment Criteria

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IMO Transmission Assessment Criteria
Bonnie Rose IMO
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Transmission Assessment Criteria

• Identifies the technical criteria the IMO uses
  for
• Connection Assessments
• Assessment of the adequacy of existing and
  planned transmission facilities to meet the
  current and future electricity needs of Ontario

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Contents

• Study Guidelines
• Study Period
• Base Case
• Load
• Power transfer capability
• Contingency Based Assessment
• Study Conditions

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Contingency Based Assessment

• IMO identifies Bulk Power System
• IMO assumes no facilities are bulk
• Apply NPCC contingencies throughout the ICG and
  examine results
• The bulk power system is that portion of the ICG
  that can have a significant adverse impact
  outside the local area
• Apply NPCC design criteria contingencies

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Contingency Based Assessment

• Local Areas
• Local areas are those portions of the ICG where
  the consequence of faults or disturbances is well
  understood and restricted to a clearly defined
  set of facilities on the ICG.
• Apply single element contingencies

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Contingency Based Assessment

• The IMO will apply bulk power system design
  criteria contingencies to local areas in cases
  when
• voltage problems propagate to higher voltage
  levels
• the net load impacted exceeds 1,000 MW

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Contents

• System Conditions
• Generation Dispatch
• to stress the system
• Exports and Imports
• to stress the system
• Stability Conditions
• 10 margin on most critical parameter

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Contents

• System Conditions
• Permissible Control Actions, following a
  contingency, to respect loading, voltage, and
  stability limit requirements
• Generation redispatch
• Automatic tripping of generation (G/R)
• Connectivity changes to change flow
• Trip or redispatch dispatchable load
• Switch reactors/capacitors

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Contents

• System Conditions
• SPS
• G/R post single contingency need for
  reinforcements

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Contents

• Pre and Post System Conditions
• Identifies acceptable pre and post contingency
  response on the ICG

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Pre and Post Contingency System Conditions

• Power Transfer Capability
• Congestion allowed
• Not allowed to lower power transfer capability
• Pre-Contingency Voltage Limits
• Transmission System Code

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Pre and Post Contingency System Conditions

• Voltage Change Limits
• Based on historical planning criteria
• 10 following contingencies
• 4 following reactive or capacitive switching
• Transient Voltage Criteria
• New
• Based on CMP and WSCC criteria

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Pre and Post Contingency System Conditions

• Steady State Voltage Stability
• PV curves (10 margin on Power)
• Damping factor
• Identify Congestion
• Line and equipment loading
• Equipment owners rating
• Transmission line at 4km/hr, 0/30
• Short Circuit Levels

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Contents

• Transmission Connection
• New or Modified Facilities
• Predominantly section 1.6 from MM2.10
• Effect on Existing Facilities
• Predominantly section 1.6 from MM2.10

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Contents

• Generation Connection
• Voltage Change
• Additional criteria - 5 on generator switching
• Wind Power
• Start-up
• Peaking units for transmission assessment
• Transmission line rating at 15km/hr within 50km
  radius

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Generation Connection

• Transmission Facilities
• Generating station gt500MW requires double circuit
  breaker 1/3 or breaker 1/2 network station
  layout

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Contents

• Station Layout
• Provides guidelines for desirable station layouts
  for switching and transformer stations
• Acceptability ultimately driven by design
  contingencies and their impact on the ICG

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Stakeholder Input

• Whats Next?
• Stakeholder this document at the Forecasts and
  Assessment Sub Committee