Matt Brewster Market Development 4135404547 mbrewsterisonecom Reliability requirements for capacity zones FCM Local Sloped Demand Curves ISO intends to use existing reliability requirements to design capacity zones demand curves ID: 815530
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July 8-10, 2014 | NEPOOL MARKETS COMMITTEE
Matt Brewster
Market Development413.540.4547 | mbrewster@iso-ne.com
Reliability requirements for capacity zones
FCM Local Sloped Demand Curves
Slide2ISO intends to use existing reliability requirements to design capacity zones demand curves
ISO-NE is not proposing to change how the
locational resource requirements (i.e., LSR, TSA, LRA, MCL) are determined as part of the demand curve projectCurrent requirements for capacity zones will be used to establish curve shape and performance criteria (as was done for the system curve)
Several questions submitted by stakeholders pertained to methods used to establish capacity zone requirementsThe concepts and methodologies are fully-described in the annual report of ICR-related values (
2017/18 report
) and Section III.12 of Market Rule 1
This presentation highlights the relevant points about resource requirement determinations for capacity zones
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Slide3Import-Constrained capacity zones
Resource requirements: LSR, LRA, TSA
Slide4For import-constrained capacity zones, the requirements define a
minimum capacity amount
Import-constrained zones are areas that, due to transmission constraints, are close to the threshold where local resources and transmission import capability may not be enough to reliably serve local demandThe Local Sourcing Requirement
(LSR) is the minimum amount of capacity that must be located within an import-constrained zone to satisfy resource adequacy and transmission security requirementsLSR is set at the higher of:
Local Resource Adequacy
(LRA) – slide 5
Transmission Security Analysis (TSA) – slide 6
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Slide5Local Resource Adequacy (LRA)
Minimum amount capacity that must be located in an import-constrained zone to meet system 0.1 days/year LOLE criteria
Probabilistic analysis which models the transmission interface limit between the zone under study and the rest of the systemImport zone target LOLE is 0.105 days/year0.105 days/year LOLE is the point at which resources available within the zone are insufficient; further reduction in local capacity would cause the system LOLE to increase above the 0.1 days/year criteria
Allowance for transmission-related LOLE of 0.005 days/yearMarket Rule 1 Section III.12.2.1.1
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Slide6Transmission Security Analysis (TSA)
Deterministic reliability screen using operable capacity analysis to develop a resource requirement for import-constrained zones which is sufficient to allow the system to operate through stressed conditions
Analysis models first contingency (N-1) and second contingency (N-1-1) conditions for the zoneDue to deterministic and transmission-security nature of TSA, some assumptions differ from those used to establish ICR
Market Rule 1 Section III.12.2.1.2
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Slide7EXPORT-Constrained capacity zones
Resource requirement: MCL
Slide8For export-constrained capacity zones, the requirement defines a
maximum capacity amount
Export-constrained zones are areas that, due to transmission export constraints, could have locked-in resources that cannot be used to reliably serve the demand in the rest of the systemThe Maximum Capacity Limit
(MCL) is the maximum amount of capacity that can be procured from an export-constrained zone to meet the ICRMCL = ICR New England
– LRA
Rest of New England (outside export zone)
ICR New England is the total amount capacity needed for the system
LRA
Rest of New England
is the minimum amount of capacity required outside the export-constrained zone to meet 0.1 days/year LOLE
Market Rule 1 Section III.12.2.2
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