DYNAMIC SCHEDULES AD HOC WORK GROUP ANN DAVIS, CHAIR MARILYN FRANZ.

DYNAMIC SCHEDULES DYNAMIC SCHEDULES AD HOC WORK GROUPAD HOC WORK GROUP

ANN DAVIS, CHAIRANN DAVIS, CHAIR

MARILYN FRANZMARILYN FRANZ


DriversDrivers

IssuesIssues

Example of current Dynamic SchedulingExample of current Dynamic Scheduling

Work Group Members – Dynamic Work Group Members – Dynamic Scheduling Experience WantedScheduling Experience Wanted

Chair Contact InformationChair Contact Information

Drivers for Considering Tagging Drivers for Considering Tagging Dynamic SchedulesDynamic Schedules

WEBSAS – Business Practice 18WEBSAS – Business Practice 18

WIT requirementsWIT requirements– Need transactions impacting Scheduled Net Need transactions impacting Scheduled Net

InterchangeInterchange– Integrate into hourly valuesIntegrate into hourly values

Common implementation within WECCCommon implementation within WECC

Drivers for Considering Tagging Drivers for Considering Tagging Dynamic SchedulesDynamic Schedules

Ready to influence NERC Dynamic Ready to influence NERC Dynamic Scheduling Work GroupScheduling Work Group

CISO requirementCISO requirement

Is tagging the answer for handling Is tagging the answer for handling Dynamic Schedules?Dynamic Schedules?

Issues Surrounding Tagging Dynamic Issues Surrounding Tagging Dynamic SchedulesSchedules

Clarification of terminology within WECC - Clarification of terminology within WECC - Dynamic Transfer vs. Dynamic Schedule Dynamic Transfer vs. Dynamic Schedule – Are Pseudo Ties part of the problem in USFAre Pseudo Ties part of the problem in USF

Should reserve sharing group energy deliveries Should reserve sharing group energy deliveries be tagged? be tagged? – NERC Policy 3.A.2.1 clarification: “Interchange NERC Policy 3.A.2.1 clarification: “Interchange

transactions established to replace unexpected transactions established to replace unexpected generation loss, such as through prearranged reserve generation loss, such as through prearranged reserve sharing agreements…exempt from tagging for 60 sharing agreements…exempt from tagging for 60 minutes….” Differing interpretations exist. minutes….” Differing interpretations exist.

Issues Surrounding Tagging Dynamic Issues Surrounding Tagging Dynamic SchedulesSchedules

Should the energy profile always be maximum amount?Should the energy profile always be maximum amount?Should the tag be updated during the hour? How often? Should the tag be updated during the hour? How often? Different process for different types? Different process for different types? – Remote Generation Needs Remote Generation Needs – Ancillary Services NeedsAncillary Services Needs

After the hour is complete, the tag can not always be After the hour is complete, the tag can not always be updated with the integrated energy (60 minute updated with the integrated energy (60 minute limitation).limitation).Costs of transferring signal directly to WIT and WebSASCosts of transferring signal directly to WIT and WebSAS

Dynamic Transfer with Multiple ParticipantsDynamic Transfer with Multiple Participants

Example:

Generator has a 500 MW output

This schedule is generated utilizing a dynamic schedule that is calculated on a Real Time basis every four seconds throughout the hour

This schedule is divided among five participants

A percentage of the schedule is divided between the participants and calculated Real Time

4 seconds

4 seconds

4 seconds

4 seconds

4 seconds

The dynamic schedule is calculated every four seconds & sent to Participants by data link from Source Control Area

Real Time Dynamic Schedule Real Time Dynamic Schedule Dynamic TransferDynamic Transfer

Generator500 MW

After the Hour =Integrated Hourly ScheduleCalculated and sent by data

link by Source Control Area

Controls AGC

There is NO imbalance!

Dynamic at the top of the hour is 500MW

Real Time:

Each participantsAGC is adjusted every 4 seconds during the hour

4 secondsC

125MW

B75MW

A125MW

D75MW

E100MW

4 seconds

4 seconds

4 seconds

4 seconds

4 seconds

The dynamic schedule is calculated every four seconds & sent to Participants by data link from Source Control Area

Real Time Dynamic Schedule ReducedReal Time Dynamic Schedule ReducedDynamic TransferDynamic Transfer

Generator250 MW

C75MW

B50MW

A50MW

D25MW

E50MW

After the Hour =Integrated Hourly

Schedule calculated and sent by data link by

Source Control Area


Plant goes to 250MW at the half

Each Participant’s AGC is adjusted every 4 seconds during the hour matching the Reduced Generator output

4 seconds

Final ResultFinal Result

On the half the unit went down to 250MWReduced Generator Output is calculated every 4 seconds

500 X 30 / 60 = 250250 X 30 /60 = 125

End of the hour = 125 + 250 = 375

After the Hour =Integrated Hourly

Schedule = 375

Controls AGC


4 secondsGenerator250 MW

•All participants were notified of their reduced share•All Control Areas checked out to integrated number

Advantages to Existing Dynamic Advantages to Existing Dynamic SchedulingScheduling

•The Dynamic schedule will change throughout the hour due to plant fluctuations•AGC automatically responds to the fluctuations•If the schedule is reduced, everyone’s percentage or share is reduced•After the hour, an integrated hourly schedule is created automatically by the EMS system•The schedule is automatically populated•Each participating control area is required to have their equipment set up to automatically send or receive dynamic signals•Minimal manual input

Tagging Limitations to Consider Tagging Limitations to Consider

•Present Tagging of Dynamic schedules does not work.

•Tagging timeframe does not allow for after the hour changes

•Each hour a tag would have to be updated with the ‘before the hour’ – estimated schedule

•Each hour a tag will have to be updated with the ‘after the hour’ dynamic value, if possible

•Dynamic tags presently do not affect the tag driven scheduling systems, thus cannot affect AGC (signal affects intra-hour).

•A tag cannot be changed Real Time every four seconds

Additional Dynamic Schedule Additional Dynamic Schedule IssuesIssues

Proposed Ad Hoc WorkgroupProposed Ad Hoc Workgroup

Group members should currently be involved with Group members should currently be involved with implementing dynamic schedulesimplementing dynamic schedulesDetermine and come to consensus on any issues related Determine and come to consensus on any issues related to handling possibly tagging dynamic schedules.to handling possibly tagging dynamic schedules.Strive for consistent implementation throughout WECCStrive for consistent implementation throughout WECCPropose any necessary Business PracticesPropose any necessary Business PracticesReview any existing WECC documents related to Review any existing WECC documents related to Dynamic Schedules and Remote Generation (2)Dynamic Schedules and Remote Generation (2)Representation in NERC Dynamic Scheduling Work Representation in NERC Dynamic Scheduling Work GroupGroup


Current Volunteers:Current Volunteers:

Ann Davis, ChairAnn Davis, Chair– Sheryl Torrey/Jennella BattlesSheryl Torrey/Jennella Battles– Jim HansenJim Hansen– Sue Holden-BakerSue Holden-Baker– Marilyn FranzMarilyn Franz


Additional VolunteersAdditional Volunteers


Contact Chair with questions/issues:Contact Chair with questions/issues:

– Ann Davis – BPATAnn Davis – BPAT360-418-8263360-418-8263

[email protected]@bpa.gov

Plan to hold a meeting in DecemberPlan to hold a meeting in December

DYNAMIC SCHEDULES AD HOC WORK GROUP ANN DAVIS, CHAIR MARILYN FRANZ.

Documents

Transcript of DYNAMIC SCHEDULES AD HOC WORK GROUP ANN DAVIS, CHAIR MARILYN FRANZ.