Transcript No Slide Title

IMO Transmission Assessment Criteria
Bonnie Rose
IMO
7/17/2015
Market Operations Standing Committee of the 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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Market Operations Standing Committee of the IMO
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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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Market Operations Standing Committee of the IMO
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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 owner’s rating
– Transmission line at 4km/hr, 0°/30°
• Short Circuit Levels
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Market Operations Standing Committee of the IMO
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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 >500MW 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
• What’s Next?
– Stakeholder this document at the
Forecasts and Assessment Sub Committee
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