1. Reliability Assessment Committee Reliability Workshop Priorities
Dave Angell, RAC Chair
Western Electricity Coordinating Council

2. Western Electricity Coordinating Council
Approach
Priority
Topic
Details
Potential
Action
Zen approach Knowing the question is the first step to knowing the answer.
Western Electricity Coordinating Council

3. Near-Term Priorities -> RAC
Improve inverter-based resources modeling in WECC base cases
Evaluate changing resource mix impacts
Clarify the roles, responsibilities and relationships between
WECC Regional Planning Groups
Transmission Planners
Other stakeholders
The answers from the Reliability Workshop are the near-term priorities
Western Electricity Coordinating Council

4. Renewable Energy Models
WECC Approved Dynamic Model Library
Version January 2018
GE PSLF
Status
Comments
reec_a
approved 3/19/14
Renewable energy electrical control model for Wind type 3/4 and Photovoltaic
reec_b
Renewable energy electrical control model for Photovoltaic
WECC Approved Dynamic Model Library
From EPRI Model User Guide - The collaborative community of stakeholders has worked under the Western Electricity Coordinating Council’s (WECC) Renewable Energy Modeling Task Force (REMTF). Thus, at the culmination of the work, the models were WECC approved and have found their way into several of the major commercial software platforms, namely, Siemens PTI PSS®E, GE PSLFTM, PowerWorld Simulator and PowerTech Labs simulations tools
Western Electricity Coordinating Council

5. Western Electricity Coordinating Council
Blue Cut Fire Event
Western Electricity Coordinating Council

6. Western Electricity Coordinating Council
Canyon 2 Fire Event
Western Electricity Coordinating Council

7. Western Electricity Coordinating Council
reec_a
Complex
Western Electricity Coordinating Council

8. Western Electricity Coordinating Council
reec_b
Simpler
Western Electricity Coordinating Council

9. Action Update WECC Approved Dynamic Model Library GE PSLF Status
Comments
reec_a
approved 3/19/14
Renewable energy electrical control model for Wind type 3/4 and Photovoltaic
reec_b
Renewable energy electrical control model for Photovoltaic
Where different variants of the same model exist, the preferred version for submittal to WECC is highlighted in green.
Western Electricity Coordinating Council

10. Changing Resource Mix Impacts
Existing transmission path ratings
Remedial Action Scheme effectiveness/fault-duty
Resource adequacy and the effectiveness of traditional methods for determining resource adequacy
The transmission and distribution system interface due to DER
Essential Reliability Services specific to the Western Interconnection
Western Electricity Coordinating Council

11. Transmission Path Ratings
Western Electricity Coordinating Council

12. Western Electricity Coordinating Council
Flow Limited Paths
Transmission Paths may be limited by the amount of available resources rather than reliability considerations
Studies and analyses performed to determine the Accepted Rating of a transfer path must use realistic simulations
A transmission Path's Accepted Rating will not be lowered because its maximum achievable flow is reduced due to system changes made by others
System owners that make such changes shall be responsible for mitigating any adverse impacts on the other system(s)
Western Electricity Coordinating Council

13. Remedial Action Scheme Effectiveness
Colstrip Remedial Action Scheme (RAS) Acceleration Trend Relay (ATR)
The generators advance during a short circuit on the power system. The ATR measures how fast the generators are advancing and trips unit(s) if to remain stable. When these units are replaced with wind, the ATR will not be available and a new RAS will need to be developed.
Western Electricity Coordinating Council

14. Path Ratings & RAS - Action
Under Review and Revision
Western Electricity Coordinating Council

15. Determining Resource Adequacy
13.5%
14%
39%
27%
Information from the WECC 2017 Reliability Report – 2016 data
Total Capacity 267,000 MW
Assess vulnerabilities from fuel availability
Need ability to analyze more resource variability
Western Electricity Coordinating Council

16. Resource Adequacy – Light Load
System Peak July 27th at 5:00 PM
System Minimum May 8th at 5:00 AM
Western Electricity Coordinating Council

17. Light Load in California
Cal Independent System Operator
Western Electricity Coordinating Council

18. Resource Adequacy – Load Variability
California Energy Commission data from November 2017
Western Electricity Coordinating Council

19. Resource Adequacy - Action
Expand resource adequacy measures
probabilistic approaches that reflect resource and load variability and reliability characteristics
Include non-peak system conditions
Western Electricity Coordinating Council

20. DER and the T & D Interface
Distributed Energy Resources energy contribution in 2017 by state
Western Electricity Coordinating Council

21. DER and the T & D Interface - Action
Ensure there is sufficient detail on DER capability and performance to determine BPS impact
Identify the type and periodicity of information needed from DER to improve load forecasting and generator modeling
Account for the uncertainty introduced by integration of variable generation and essential reliability services
Western Electricity Coordinating Council

22. Western Interconnection Essential Reliability Services
Western Electricity Coordinating Council

23. Essential Reliability Services - Action
All new resources should have the capability to support voltage and frequency - FERC
Forecasting, visibility, and participation of DERs as an active part of the electric grid – Utility Planners and WECC
Western Electricity Coordinating Council

24. Western Electricity Coordinating Council
Clarify the Three Rs
Planning
Regions
Responsibility
WECC
Role
Stake-holder
Relationship
Western Electricity Coordinating Council

25. Questions Dave Angell dangell@idahopower.com (208) 388-2701
Here is what you should expect to see in December
A three-year work plan
Western Electricity Coordinating Council