Enhancing Western Interconnection Congestion Management
Addressing congestion management challenges within the Western Interconnection through the Western Interconnection Unscheduled Flow Mitigation Plan (WIUFMP). The plan focuses on curtailing tagged energy transfers during critical events and optimizing generation-to-load impact calculations, aiming to ensure reliable and efficient power flow across the grid. Additionally, efforts are being made to expand the scope of curtailment options and increase visibility for market participants.
Download Presentation
Please find below an Image/Link to download the presentation.
The content on the website is provided AS IS for your information and personal use only. It may not be sold, licensed, or shared on other websites without obtaining consent from the author. Download presentation by click this link. If you encounter any issues during the download, it is possible that the publisher has removed the file from their server.
E N D
Presentation Transcript
UFMP EXPANSION BEYOND TAGS CURTAILMENT UFC/ECCWG JOINT MEETING 1/15/2021 Helping our members work together to keep the lights on... today and in the future. SPPorg southwest-power-pool 1 SouthwestPowerPool
OBJECTIVE Background Problem Statement Design Objective Generation-To-Load Impact Calculation Tag Impact Calculation Prioritizing and Curtailment Options Things To Consider 2
BACKGROUND Western Interconnection-wide congestion management is limited to 4 Qualified Paths. The Paths are used as proxy elements for power transfer management across various elements (Qualified Elements) During a WIUFMP event, and after Phase Shifter adjustment only energy that is tagged and scheduled is subject to curtailment. This is the case for intra BA and interchange transactions. Source/Sink of each tag is used to determine the impact of the tag across a Qualified Paths 4
WIUFMP CURTAILMENT OF MWS IN STEP 4 7-F On-Path 7-F Off-Path Unaccounted MWs On Path is defined by Source/Sink Combination on each Qualified Path Only product subject to curtailment. Tags - Inter and Intra BA Tags 0-NX On-Path 0-NX Off-Path Intra-BA Untagged Generation to Load Impact 5
ECCWG STRATEGIC SESSION PHASES 1. UFMP Enhancements: Visibility (open up more to merchants) Line up tariff Clarify QP & QE UFMP Plus: Expand to non-tag curtailment (GTL/NNL) UFMP Extra Plus: Open to all constraints UFMP Market Plus Allow Market Flows & constraint market coordination JOA UFMP Ultimate M2M & all of the above 1. 2. 3. 2. 1. 3. 1. 4. 1. 2. 5. 1. 7
ECCWG CONCERNS (ITEM 2 & 3) 1. For intra BA schedules, BAs/TOPs are subject to transmission schedule curtailment by the WIUFMP depending on their schedule practices and not based on the priority of the schedule. 2. Other Impactful MW impacts on a constraint may not be curtailable even if they contribute to significant loop flows or direct impact on a Qualified Path. 3. There is interest in addressing congestion management across specific SOLs and allocate equitable and effective relief to any impacting entity on an element. 8
DESIGN OBJECTIVE Expand Transmission relief allocation to tags and BA non- tagged impact equitably and effectively utilizing transmission priorities and a threshold impact. Ability to capture the impact breakdown of every constraint created by a TOP, BA or RC utilizing the ECC application. 9
BA GENERATION TO LOAD (GTL) IMPACT 10
GTL Calculate the impact of any BA serving its load within its boundary on transmission constraints Calculation is performed on a generator level utilizing the Real-Time MW submitted Any MWs used to support an external obligation (e.g. Tag) is subtracted from the Real-Time MW of the generators support the obligation 11
DATA REQUIREMENT Generator Real-Time MW Load Real-Time MW If Load and Generation are not balanced with NSI, generation is further adjusted to match load and NSI Real-Time Topology System outages for transmission lines Real-Time tap setting for Phase Shifters Real-Time Control Devices Flows 12
GTL BA IMPACT ON CONSTRAINTS BA x BA y Gx1 Gy1 Constraint A Gx2 Gy2 LD y LD x GTL BA x = Gx1 MW * ( GSF Gx1 LSF LD x ) + Gx2 MW * ( GSF Gx2 LSF LD x ) GTL BA y = Gy1 MW * ( GSF Gy1 LSF LD y ) + Gy2 MW * ( GSF Gy2 LSF LD y) 13
BA Zone Y Zone X Constraint A Gy1 Gx1 LD x LD y GTL Zone x Native= Gx1 MW -T1 MW * ( GSF Gx1 LSF LD x ) GTL Zone y Native= Gy1 MW * ( GSF Gy1 LSF LD y ) GTL Transfer GTL BA = GTL Zone x Native +GTL Zone y Native + T1 MW * ( GSF Gx1 - LSF LD y ) 14
GTL CALCULATION METHODOLOGY GTL for every BA represents its impact of serving generation to load Any BA can be split into multiple Zones for more granularity and precision in specifying which MWs serve What load The difference between Native and Transfer components in GTL are the designated load that each generator serves. Native serves load within same Zone Transfer serves load for deficient Zones within the same BA 15
GTL ADJUSTMENT FOR TAGS Any exports tags from a BA result in adjustment of generation. This is basically trying to separate MWs that serve the load within the BA/Zone and those that support the tag MWs supporting a tag don t count as part of GTL. They are accounted for on the tag impact Any import tags from a BA result in adjustment of load. This is basically trying to separate MWs served by the generation within the BA/Zone and those served by the tag Tag MWs serving a load don t count as part of GTL. They are accounted for on the tag impact Intra BA tags should also be adjusted from the BA and Load of the BA in order to reserve GTL impact to untagged component of the BA. 16
TAG IMPACT 17
TAG Calculate the impact of tags on constraints as is done today. TDF Methodology TDF Source TDF Sink The Source on the Sink on the schedule determine the generation supporting the scheduling and the element receiving the MWs. Important for GTL calculation This impacts the GTL MWs 18
PRIORITIZING AND CURTAILMENT OPTIONS 19
TAG PRIORITIZATION Tags are prioritized according to the transmission service used on the tags and identified on the schedule The logic works the same as today 20
GTL PRIORITIZATION (FIRM VS. NON-FIRM) Option 1: Designate all untagged Intra BA Flows as GTL and all GTL as Firm. Continue to curtail tags inter and intra BA according to their transmission priority. Curtail GTL pro-rata with Tags as firm. Treat all GTL as On-Path or create a process for On vs. Off Path of GTL. Option 2: Require that each BA designates each generation with a transmission priority designated to serve the load within the BA Continue to curtail tags inter and intra BA according to their transmission priority. Curtail GTL pro-rata with Tags across the appropriate priorities. Treat all GTL as On-Path or create a process for On vs. Off Path of GTL. 21
THINGS TO CONSIDER Design Curtailment procedures should include relief control logic and other items to-be determined. ECC performs most of these impact calculations today. Tariff language need to be modified. May consider filing a business practice standard to support the practice and file it with FERC. 22
