Post on 27-Mar-2015
Briefing on California ISODynamic Transfers Stakeholder Process
For WECC Seams Issues Subcommittee MeetingMay 4, 2010
Jim Price, Lead Engineering SpecialistCalifornia ISO, Market Analysis & Development
2
Background:Dynamic Transfer Functionality
Uses of Dynamic Scheduling Functionality Load Following / Real Time Balancing Energy Dispatch Split Unit Share (Jointly Owned Units) Ancillary Services / Regulation Imports “Intermittent” Generation Import Scheduling Facilitate Implementation of Pseudo-Ties
Pseudo-Tie Transfer of BA Jurisdiction (Scheduling, Balancing Energy,
Regulation, Outage Coordination) Pseudo-Tie Generator treated as internal Participating
Generator by Attaining BA
CAISO Balancing AuthorityCAISO Balancing AuthorityImport @ designated Physical Tie
500 MW
Native Balancing AuthorityNative Balancing Authority
Generator or logical determined output is telemetereddirectly to the CAISO EMS
Dynamically Scheduled Generating Facility
Physical Ties between CAISO and Native BA
Ties between the ISO and other BAs
Dynamic Schedules
Pseudo Ties
ISO (Attaining) Balancing Authority
Native Balancing Authority
100 MW
Net Scheduled Interchangeis zero due to the Pseudo-tie “Export”offsetting Physical Tie “Import”
Generator output is telemetereddirectly to the ISO EMS
ISOPTG
GeneratingFacility
Non-Contiguous ISOBalancing Authority
Physical Ties betweenthe ISO and Native BA
Physical Ties between the ISO and other BAs
“Import” @ designated Physical Tie
100 MW
“Export” @ Pseudo Tie
Slide 5
Outline of Dynamic Transfers Stakeholder Process
Straw Proposal clarifies ISO tariff supporting dynamic imports, facilitates imports of renewable resources, and adds pseudo-tie imports to tariff Proposals apply to both dynamic scheduling and pseudo-ties
Few exceptions: allocation of dynamic schedules’ deviations, pseudo-tie layoffs
Key dates (stakeholder meetings 7 days after documents): Issue Paper published 11/30/2009 Straw Proposal published 3/10/2010 Supplement to Straw Proposal published 4/29/2010
Stakeholder meeting 5/6/2010 (http://www.caiso.com/2779/2779b9ca24600.html for details)
Draft Final Proposal to be published 5/20/2010 ISO Board of Governors meeting 7/26-27/2010 FERC filing in August
Current ISO tariff supports dynamic scheduling
Allows imports of energy and AS, provided that:
a) Such dynamic scheduling is technically feasible and consistent with NERC and WECC reliability standards,
b) All operating, technical, and business requirements for dynamic scheduling functionality of ISO’s Dynamic Scheduling Protocol, or standards on ISO website, are satisfied,
c) Scheduling Coordinator executes a Dynamic Scheduling Agreement, and
d) All affected native and intermediary BAAs each execute an operating agreement with the ISO related to the operation of dynamic functionality.
Issue for intermittent resources is how to meet standards and requirements.
Slide 6
Slide 7
Scope of Dynamic Transfers Stakeholder Process
Issues addressed in Stakeholder Process: Congestion management within ISO markets:
Curtailment rules Dispatchability requirements Transmission reservations and utilization Data and forecasting requirements
Locational modeling and pricing Aggregation of conventional and/or renewable resources Scope of studies of intertie transfer limits for dynamic imports Pro rata allocation of deviations among BAAs Layoffs from pseudo-ties Dynamic exports Generator-only BAAs
Other issues are being addressed in other ways or being deferred to other general policy forums
Issue Forum for consideration of issue
Management of increased load following and regulation requirements
Stakeholder processes starting in Q2: AS Market Product Review, Scheduling & Dispatch Enhancements for Intermittent Resources
Responsibility for operating reserve No tariff change needed
Extension or modification of Participating Intermittent Resource Program
Stakeholder process starting in Q2: Scheduling & Dispatch Enhancements for Intermittent Resources
Pseudo-tie loads Develop using pilots before tariff change
Interconnection standards and system operations
Current stakeholder process: Interconnection Standards Review for Renewable Integration
Transmission planning Current stakeholder processes: e.g., Renewable Energy Transmission Planning Process (RETPP)
Uninstructed deviation penalty Existing tariff enables ISO to obtain needed compliance
Certification of ancillary services Existing tariff enables ISO to certify performanceSlide 8
Meeting standards and requirements
ISO dispatches dynamic resources for congestion management and energy balance (and other requirements), and needs prompt response
Current tariff measures dynamic resources’ response as tolerance band around schedules & dispatches
Meaningful “dispatch” of intermittent resources requires updates of real-time conditions “Dispatching” to current delivery is workable but provides no
knowledge of future delivery. Option will allow 5-minute updates of availability for 2-hour look-
ahead. (Note: can be seen as intra-hour schedule changes)
Meaningful compliance will be for operating orders
Locational modeling for dynamic transfers
ISO’s Full Network Model places generation at actual location, and includes external transmission
Dynamic scheduling and pseudo-tie agreements establish actual location of resource-specific system resources
Modeling dynamic resources at actual location provides accurate congestion management, based on value of resource in ISO markets Constraints enforced only within ISO, Marginal losses only computed within ISO
To avoid disparities between ISO’s dispatch and resources’ response, ISO will use locational price (LMP) Same price applies to layoffs from pseudo-ties
Slide 11
Aggregation of “electrically close” conventional and/or renewable resources Both the native and
attaining BAs have roles in approving aggregations.
ISO will use WECC’s USF zones, within BAA boundaries, to determine what external resources are “electrically close” from ISO perspective.
Dynamic import study objectives
Slide 12
• ISO tariff allows the ISO to establish limits to the amount of ancillary services and/or energy imported into the ISO BAA, whether delivered dynamically or statically.
• Study will determine any limitations on dynamic transfer of variable resources into ISO BAA while shaping and firming energy within the ISO BAA due to:
• Impacts to existing path limits that accommodate planned hourly variations from 20 minute ramping period
• Voltage control issues• Risk to stability or excitation of low frequency modes of oscillation
• ISO will coordinate studies with our neighboring BAs