1. James Wells – PWG Chair May 25, 2018
PWG Review Summary
James Wells – PWG Chair
May 25, 2018
Western Electricity Coordinating Council

2. Western Electricity Coordinating Council
PWG Membership
Western Electricity Coordinating Council

3. PWG Membership & Charter
Currently Two Open Spots
One open designated spot from Rocky Mountain Region
One at large spot
Charter review and membership evaluation to accommodate additional Reliability Coordinators in the Western Interconnection.
Membership & Voting could be expanded:
One from each RC
One from each RSG
Any interest or recommendations of candidates for membership please contact WECC Staff Liaison or PWG Chair
Western Electricity Coordinating Council

4. PWG Action Item Tracking
New form for tracking action items developed
Working with WECC IT to create location for easy access
New drop down for action items
Western Electricity Coordinating Council

5. Western Electricity Coordinating Council
BAL Retirement
Officially Retired
FERC Approved Retirement BAL Manual Time Error Correction
Effective April 1, 2017
NAESB has informational filing to retire WEQ-006 Manual TEC Business Practice Standard
Opportunity for FERC and NASBE to communicate better
Western Electricity Coordinating Council

6. Western Electricity Coordinating Council
BAL Retirement
Delta TE still required to be tracked for WI BAL-004-WECC-2 ATEC
Peak RC and Avista (Western Interconnection time monitors) have upgraded system clocks and are ready to capture larger accumulated TE
Recommended:
Entities review system clocks and processes. Accumulated time error could exceed current clock capabilities
Peak RC transmits accumulated TE and delta TE via ICCP if needed by entities
Western Electricity Coordinating Council

7. Western Electricity Coordinating Council
BAL Retirement
PWG encourages WECC & Peak RC to publish formal communication
NERC Guideline exists. Peak RC as regional time monitor has ability to call for Manual Time Error Correction for reliability purposes.
MTEC could be called upon via operating instruction or directive
No document from Peak has been published defining any reliability reasons for MTEC
PWG views MTEC as a commercial service that is not tied to reliability and accurate time can be obtained from alternative sources. Other Reliability Standards establish criteria and limits for frequency. As such PWG does not anticipate Peak RC to call for MTEC in the future.
Western Electricity Coordinating Council

8. Western Electricity Coordinating Council
BAL-004-WECC-3
WECC-0124 SAR & Drafting Team
Scope:
Addressing R1 regarding PII reconciliation to WIT tool
Standard tool (one), regardless of multiple RC
NERC Board Approved. Pending FERC Approval.
Recommendation:
Entities not using WIT for PII calculation and PII accumulation should review calculations and processes
Reconcile with WIT prior to standard becoming enforceable.
Western Electricity Coordinating Council

9. Western Electricity Coordinating Council
BAL SAR
NWPP submitted technical document to support the SAR
2 SARs on the NERC level have been combined
Drafting team actively working on BAL-003 standard update
Identifies potential reliability gaps in standard
Real Time Reliability, Event Selection, Measurement, Assumptions behind the standard
Phase 1 - Focus on IFRO calculation and fix administrative issues with attachments
Timeline/Goal: Draft out for comment in October Timeframe
Western Electricity Coordinating Council

10. Western Electricity Coordinating Council
BAL (SAR)
NERC SAR Proposing BAL-002-3
Goal: Provide clarification when BA is exempt from meeting 15 minute DCS rule
Passed Ballot
Drafting Team will receive and review comments in the next few weeks
Future Action: Final posting and NERC 10 day ballot
Western Electricity Coordinating Council

11. BAL-002-WECC-2 Field Trial
Field Test planned for 2 years
1 Year of data collected
*** DCS events since implementation of Field Test (May 1, 2017)
Allowing entities to determine appropriate spin % for their system has not degraded DCS performance
100% pass rate of DCS events
Western Electricity Coordinating Council

12. BAL-002-WECC-2 Field Trial
Entities have been carrying over 50% of MSSC as spinning reserve (at least during reportable disturbances)
This does not necessarily mean entities have been carrying 50% spinning reserve at all times
Spinning reserve may be carried for other reasons
BAL FRO
Variable based generation resources
Western Electricity Coordinating Council

13. BAL-002-WECC-2 Field Trial
WECC-0115 Drafting Team to reconvene to prepare report to move forward with retirement of R2
Field Test Active for 1 more year
Goal: Retirement of R2 within next year
Concern the field test data could be misinterpreted in efforts to retire the BAL-002-WECC-2 R2
Field Test may need to be extended until FERC approval of BAL-002-WECC-2 R2 retirement
Western Electricity Coordinating Council

14. BAL-002-WECC-2 Field Trial
Entity #
# DCS Events
Average Loss (MW)
Average Contingency Reserve Obligation (MW)
Average Spin (MW)
% Pass
Entity 1
N/A
100%
Entity 2 3
509
554
400
Entity 3 2
505
585
1022
Entity 4
Entity 5 34
626
3511
6204
Western Electricity Coordinating Council

15. BAL-002-WECC-2 Field Trial
# of events
Average Loss (MW)
***
Western Electricity Coordinating Council

16. PII – NSI Calculated Ramp
Proof of Concept with data from May & June 2017 data from PWG member BA
Minimal impact or benefit
Potentially extremely costly to implement
PWG no longer pursuing
Western Electricity Coordinating Council

17. PII – Alberta Islanding
PII = (1-Y) * (IIactual - Bi * ΔTE/6)
Alberta Islanded from the Western Interconnection starting October 2nd to October 6th
Even though Alberta NAI and NSI were 0
WIT did not recognize them as being islanded
Due to the bias term in PII, Alberta erroneously accumulated PII
Western Electricity Coordinating Council

18. PII – Alberta Islanding
Retroactive Fix:
OATI made a one time PII change in WIT for Alberta
Corrective Action Going Forward:
Alberta uses a fixed bias, investigating capability of sending fixed bias hourly via EIDE protocol where dispatchers could update bias in real time to 0 when islanded
PWG Guideline Development
Developing guideline and best practices for entities to utilize to prevent erroneous PII accumulation during islanding
Evaluating PII accumulation for offline generation only BAs
Once developed will be channeled through WECC OC for review and approval
Western Electricity Coordinating Council

19. Event/Disturbances & Schedule Cuts
Several PDCI Blocks in 2017
Resulting in NW RAS Generation Drop
Canadian/United States Separation Event
During events prolonged frequency events were experienced as a result of delayed schedule cuts
Western Electricity Coordinating Council

20. Event/Disturbances & Schedule Cuts
Ongoing analysis of PDCI and other events
PWG defining problem and scope with examples
Planned coordination with ISAS to develop best practice guideline for schedule cuts following an even/disturbance
Western Electricity Coordinating Council

21. Western Electricity Coordinating Council
ERSWG Measures
Essential Reliability Service Work Group Measures
Voltage Control
Frequency Response
Load and Resource Balancing
Inertia
Trends over time as generation portfolio changes
Net Ramp and Demands Curves
Rate of Change of Frequency (RoCoF)
Western Electricity Coordinating Council

22. Western Electricity Coordinating Council
ERSWG Measures
Goal is not to create more work, but to interpret/validate what NERC is doing
Make sure we can advise EPAS and OC how control performance is trending
Western Electricity Coordinating Council

23. Patterns of Frequency Deviation
PWG is evaluating time of day patters for frequency deviation
PWG will be exploring these trends further and with more depth
Solar generation
Wind generation
ACE
Inertia (Wester Interconnection, Southern Area vs Northern Area)
Developing formal request to Peak RC
Capture additional data (inertia, non-synchronous generation, etc) by BA/region.
PWG is in the discovery phase, has not seen this type of analysis performed
Western Electricity Coordinating Council

24. Patterns of Frequency Deviation
Western Electricity Coordinating Council

25. WECC Performance Charts
Western Electricity Coordinating Council

26. Western Electricity Coordinating Council
Accumulated TE Trend
Western Electricity Coordinating Council

27. Number of TE Corrections
Western Electricity Coordinating Council

28. Duration of TE Correction (Hours)
Western Electricity Coordinating Council

29. Western Electricity Coordinating Council
On and OFF Peak ABS
Western Electricity Coordinating Council

30. Interconnection Ave CPS1 Trend
Western Electricity Coordinating Council

31. Western Electricity Coordinating Council
BAAL Exceedance min
Western Electricity Coordinating Council

32. Western Electricity Coordinating Council
BAAL Exceedance min
Western Electricity Coordinating Council

33. BAAL Exceedance > 20 min
Western Electricity Coordinating Council