Next-day Study Task Force Steve Ashbaker Director Operations Performance Analysis Jason Ausmus Peak RC W ESTERN E LECTRICITY C OORDINATING C OUNCIL

W E S T E R N E L E C T R I C I T Y C O O R D I N A T I N G C OU N C I L

Next-day Study Task ForceSteve Ashbaker

Director Operations Performance Analysis

Jason Ausmus

Peak RC

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September 8, 2011 SW Joint FERC/NERC Report Activity

• Why are we here today? Joint FERC/NERC Report Recommendations and Activities (O&P #2 – NDS)

I. Failure to Conduct and Share Next-Day Studies

II. Lack of Updated External Networks in Next-Day Study Models

III. Sub-100 kV Facilities Not Adequately Considered in Next-Day Studies

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NDS Task Force

• NDS Task Force created– WECC TOPs– Representatives from WECC Sub-

regional Study Groups– Peak RC

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Next-day Study Guideline

• NDS Guideline posted for comment – February 4-18

• NDSTF consider and incorporate comments• NDSTF meets on February 20

– Review and consider comments• February 24 WECC posts NDS Guideline for 30

day OC approval– March 25-26 Meetings

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NDSTF Leadership

• Staff Liaison – Steve Ashbaker/WECC• Chair – Jason Ausmus/Peak RC• Vice Chair – Phillip Shafeei/Colorado Springs

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NDSTF – Entities Represented

• Total of 35 entities on NDSTF roster

AESO APS Avista BC HydroBPA CAISO CFE Chelan PUDTacoma Power Colorado Springs El Paso Electric Grant Co PUDIdaho Power IID IREA LADWPMID Nevada Power PacifiCorp Peak RCPG&E PNM Pend Oreille PUD PRPAPuget Sound SCE SDG&E SMUDSRP TEP TSGT WAPA – WACM

WAPA – WALC WECC Xcel

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NDSTF Timeline

• Feb/March NDS Strategy Documented drafted• Face-to-face kickoff meeting held March 31-

April 1st

– 5 other face-to-face meetings would follow– Meetings served as “brainstorming” sessions for

the work items• Bi-weekly webinars April through Mid-Jan

2015

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NDS Strategy – Work Items

I. What Near-Term Studies Need to Accomplish

II. Types of Input Data to the Near-term Study Process

III. Performing the Near-term Studies

IV. Sharing and Coordinating Study Results and Operational Plans

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Work Item 1 - What Near-Term Studies Need to Accomplish

• Scope: Next-day vs. Near-term– Outside of scope: Real-time Studies, Outage

Planning, Seasonal Studies– In scope: Same-day Study, Next-day Study– Where does Outage Coordination (OC) fit in?

• OC was not the focus of the NDSTF – Separate effort from the RC to follow

• Improving Near-term studies (i.e. input data, studies performed) will also benefit OC

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Work Item 1 - What Near-Term Studies Need to Accomplish

• Near-term = Same-day + Next-day• Near-term Studies are a process• The process is iterative

– Studies are performed in advance of Real-time– System is dynamic; Input data changes often– Process must be flexible enough to consider input

data changes• Near-term studies ideally become more

accurate with each iteration

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Work Item 1 and RC Data Request

• In order to support an iterative study process, RC has revised the data request– Planned Outage and Load Forecast– 4 business days vs. 1 business day

• Concepts in the white paper will drive future RC Data Request changes

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Work Item 2 – Input Data for Near-term Studies

• Most important and largest work items for NDSTF

• Brainstorming session led to well over 50 pieces of input data

• Due to timing and scope, NDSTF settled on 4 key items:– Topology, Load Forecast, Generator Unit Forecast,

and Net Interchange

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Work Item 2 – Input Data for Near-term Studies

• Input data brainstorming session had a very common theme…need to address COS!

• COS is the common outage tool of the interconnection

• Problems noted:– COS labels unclear and inconsistent– Interpreting outage isolation is difficult– COS mostly a one-way tool

• Data is sent to it, but not many extract data out of it

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Work Item 2 – COS Outage Manual

• To address previously stated issues, group put together the Coordinated Outage System (COS) Outage Manual

• Introduces the following concepts:– Switching point outage data submission– Outage End-State, i.e. state in which switching is

complete and work is ready to begin

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Work Item 2 – COS Outage Manual Example

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Work Item 2 – COS Outage Manual Example

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Work Item 2 – COS Outage Manual

• COS Outage Manual is essentially the end state of the outage submission process– Needed to be done first

• COS Data Dictionary will need to be trued up to accommodate necessary switching points– Peak effort underway internally; external outreach

coming soon• Manual eventually a part of the COS User

Guide which RC Data Request will point to

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Other Input Items

• Load Forecast, Generation Unit Forecast, Net Interchange

• NDSTF created initial definition of each• RC Data Request has also begun internal effort

to refine each item– NDSTF work used as starting point in revision

W E S T E R N E L E C T R I C I T Y C O O R D I N A T I N G C O U N C I L

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NDSTF Input Data Needs

• Load forecast boundary understanding– What is being accounted for in the number? E.g.

system losses, pseudo ties, area, etc.• Interchange

– Same boundary issues as with load• Generator Forecast Data

– Unit Commitment– Unit Output– Pmax, Pmin, AGC, AVR, etc.

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NDSTF Input Data Quality

• Data timing considerations?– Generator and Interchange availability and

accuracy– Optimal time when accurate data is available

• Input Data Benchmarking– Develop awareness of Good vs Bad data– Best practices for dealing with bad data

• Refine where possible to improve study quality

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Work Item 3 – Performing the Near-term Studies

• As with work item 2, narrowed focus to core Near-term studies being performed

• Steady-state analysis (pre- and post-contingency) study results– Thermal– Steady-state Voltage Violation– Unsolved Base Case and Contingencies– Identification of Islands

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Work Item 3 – Performing the Near-term Studies

• Study Criteria– Points to RC’s SOL Methodology

• Study Results Validation– Important step in interpreting study results– Techniques describes on how to troubleshoot– Essentially another round of Input Data

Benchmarking!

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Work Item 4 - Sharing and Coordinating Study Results and Operational Plans

• NDSTF originally attempted to create interconnection wide study results template

• Many entities presented their own study result templates at a face-to-face meeting

• Number of great ideas, even came up with the core categories

• Group decided an interconnection template was too difficult to pursue at this time

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Work Item 4 - Sharing and Coordinating Study Results and Operational Plans

• Group decided most immediate impact was to focus on more “significant” system issues

• Using Peak’s Operating Memos, the group created the Outage Operating Memo template

• Outage Operating Memo is outage based– Template created from Peak’s original document

and modified by NDSTF– Guidelines document created to indicate the need,

responsibilities and coordination

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Work Item 4 – Outage Operating Memo Guidelines

• Document covers: Purpose, Description, Responsibility, Significant Impact Criteria, Timelines, Review, Distribution

• Goal is to have the guidelines document and template place on PeakRC.org

• Every entity will have a folder, similar to entity studies area

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Work Item 4 – Outage Operating Memo Template

• Sample Outage Operating Memo Template

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Next Steps

• Comment period for the draft NDSTF white paper and exhibits currently open

• Please submit comments back to [email protected]

• Comments must be submitted by close of business Wed Feb 18th, 2015

mailto:[email protected]

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Q&A Session

Questions and/or comments??

Additional question or comments, please send to [email protected]

mailto:[email protected]

Documents

Next-day Study Task Force Steve Ashbaker Director Operations Performance Analysis Jason Ausmus Peak RC W ESTERN E LECTRICITY C OORDINATING C OUNCIL