20130226 psc item 04 under-frequency load shed methodology.pdf
TRANSCRIPT
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8/14/2019 20130226 PSC Item 04 Under-Frequency Load Shed Methodology.pdf
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Planning Subcommittee
Status Update on
PRC-006-1 UFLS
Methodology
February 26, 2012
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Status Update
MISO is presently collecting UFLS data and developingmethodology
Islanding Criteria and Methodology Workshop to be held
the week of March 18-22
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Islanding Criteria Requirements
PCs must have documented islanding criteria thatconsider
Historical events
System studies
Any island formed intentionally by a Special Protection System
Each Regional Reliability Organization (RRO) in MISO must be
studied as an island
R1
R2.1
R2.1
R2.2
R2.3
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Draft Islanding Criteria
MISO shall consider the following to identify one or moreislands:
Historical events
System studies
MISO Annual LOLE Study: Load Resource Zones (LRZ)
A subset of each RRO in MISO
Other considerations
Historical NERC Regional Council boundaries
Inspection: interfaces with weak or few ties; natural geographic
boundaries
Reserve sharing zones
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Considerations
What should be the minimum size island MISO studies? NERC Event Severity Categories:
Category 2: unintentional island of 100-4999 MW
Category 3: unintentional island of 5000-9999 MW
Category 4: unintentional island of 10000+ MW
How far back should we look for historical events?
Please advise us as soon as possible of pertinent
historical islands in your footprints
Respond to Tylerby March 12
These questions will be finalized after the IslandingCriteria and Methodology Workshop
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Major Historical Events
September 18, 2007
6MRO
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Major Historical Events
June 25, 1998
7NERC
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NERC Regional Entities
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MISO is required to consider each Region as an island
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Historic NERC Regional Councils
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Historic boundaries may guide judgment in islandinterface selection
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Planning Coordinators
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MISO will coordinate studies with adjacent PCs, but willnot study ComEd as an island
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Transmission Owners
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Boundaries may guide judgment in island interfaceselection (Load Resource Zones shown)
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Reserve Sharing Zones
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Boundaries may guide judgment in island interfaceselection
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Reserve Sharing Zones
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Boundaries may guide judgment in island interfaceselection
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Future: Analytical island identification
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The problem of identifying islands with weak ties and/orload imbalance neatly conforms to some multilevel graph
partitioning algorithms
An analytical approach might give insight into possible
islands that are missed by inspection
Proposed as a future project
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Roadmap Summary
2013 PC develops islanding criteria in collaboration with stakeholders
PC builds UFLS database
PC performs design assessment, identifies any necessary
changes to existing regime
UFLS Entities, GOs, TOs implement revised Program
Every year
PC maintains database
Every five years
PC performs design assessment, identifies any necessarychanges to existing regime
UFLS Entities, TOs, GOs implement revised Program
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2013 Plan
Jan: UFLS Entity, GO data request Feb: Draft Islanding Criteria
Mar: Refine Methodology at Workshop
Populate UFLS Database
Apr: Finalize scope and launch study
Jul: Complete study
Aug: Draft UFLS Design Assessment
Comment period
Sep: Comment response
Final UFLS Design Assessment Oct: UFLS Program finalized
PRC-006-1 becomes effective
Implementation schedule communicated
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Immediate next steps
Please respond to UFLS data request by March 8
Please contact Tyler [email protected] David
[email protected] March 12 with your input
on study methodology and islanding criteria
Email us TODAY if you would like to attend the Islanding
Criteria and Methodology Workshop the week of March
18-22 and you have a date preference
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mailto:[email protected]:[email protected]:[email protected]:[email protected]