Annual Study Program Scope of Work
WECC Guideline
SRWG Approved
Introduction
The WECC Annual Study Program consists of two primary activities:
1. the development of steady state and dynamic base case models (base cases); and
2. an annual assessment of Transmission System performance based on selective disturbances
simulated using the base cases.
The base cases are developed through a joint effort between WECC staff and various planning and
operating entities throughout WECC.
Development of Base Cases
The System Review Work Group (SRWG) is tasked with compiling a set of base cases annually. A Base
Case Compilation Schedule is developed to establish timelines and scenarios to model. The SRWG Data
Preparation Manual defines the process applicable entities follow to compile the base cases.
Compilation of base cases consists of three distinct phases.
1. Initial Data Submittal Phase
2. Review Phase
3. Final Approval Phase
Base Case Compilation Schedule
The Base Case Compilation Schedule is drafted by the SRWG. The drafting process includes conducting
a survey of Technical Studies Subcommittee (TSS) and SRWG members to provide input on the desired
base case scenarios to be compiled. Results of the survey are discussed during SRWG forums.
The objectives of each annual Base Case Compilation Schedule are:
1. Provide a detailed schedule, to appropriate stakeholders, identifying necessary data
submittals and data review milestones to compile WECC base cases.
2. Identify base cases to be compiled. A typical annual base case compilation schedule
includes the following base cases:
a.
b.
Five operating cases
Three scenario cases – one case will “stress” the following in a five-year rotation:
i. Idaho/Montana/Wyoming
ii. Colorado/Utah/Northern Nevada
WESTERN ELECTRICITY COORDINATING COUNCIL
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Annual Study Program Scope of Work
c.
d.
e.
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iii. Pacific NW and Canada including the California-Oregon Intertie
iv. California (between Path 15 and West of Colorado River)
v. Southern Nevada/Arizona/New Mexico
One five-year summer planning case
One five-year winter planning case
One 10-year planning case (alternate winter and summer)
3. Promote compliance of Transmission Operators, Transmission Planners, Planning
Coordinators, and other Functional Entities with the following NERC Reliability Standards:
a.
b.
MOD-032-1 – Data for Power System Modeling and Analysis
TPL-001-4 – Transmission System Planning Performance Requirements
WECC shall post each steady-state and dynamic data request specified in this schedule on the WECC
Website, at least eight weeks prior to the required due dates for data submittal back to WECC, and at a
minimum will include each of the following elements:
1. A statement of the purpose for which the case will be developed;
2. The case year;
3. The case season;
4. The case load, generation and interchange requirements; and
5. Required due dates for data submittal to the WECC.
Initial Data Submittal Phase
WECC staff posts a data request letter stating the desired data to be submitted to compile a base case
as identified in the present year’s Base Case Compilation Schedule. Applicable functional entities are
required to provide the requested data following the requirements and procedures provided in the
SRWG Data Preparation Manual.
Review Phase
WECC staff will use the data provided in the initial data submittal phase to compile the desired base
case. Upon compilation completion, the following actions will be performed on the base case:
1. Simulation of Standard Disturbances using steady state and transient stability contingency
analysis techniques.
a.
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Steady state limit monitoring will be set to 100 percent of the applicable facility
ratings including thermal and voltage ratings, total load and generation dropped,
Remedial Action Scheme functions, and insolvability.
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Annual Study Program Scope of Work
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Transient stability limit monitoring will be set to the applicable criteria defined in TPL001-WECC-RBP and generation loss of synchronism.
2. Running the Representation Log and Data Check routines.
The compiled base case and results from the above actions will be posted for applicable entities to
review.
Final Approval Phase
After incorporating data corrections and comments received during the Review Phase, WECC staff will
re-conduct the actions performed in the Review Phase. WECC shall post on the WECC website the
approved solved and solvable base case data and supporting documentation, the Representation Log,
and Data Check.
Annual Assessment of Transmission System
An Annual Study Program Report will be developed containing:
1. a summary of the base cases compiled since the previous year’s Annual Study Program
Report and related contingency analysis results, Representation Log, and Data Checks
conducted during the Final Approval Phase of each base case; and
2. the description, analysis, and results of a special study. Identified issues discovered by the
Annual Study Program will documented in the Annual Study Program Results Log.
Summary of Base Cases Compiled
WECC Staff will document a summary of significant system parameters and metrics for each base case
since the previous year’s Annual Study Program Report. The parameters and metrics may include the
following:
1. Representation Log totals trending
2. Comparison of desired and actual Path loading
3. Total System load and generation levels
Special Study
The Annual Study Program is intended to facilitate a special study as requested by other WECC
committees. A special study would include analysis conducted in addition to the study work already
performed for the Annual Study Program. Simulation of the Standard Disturbances on the base cases,
including the “stressed” area rotating case, does not constitute a special study.
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Annual Study Program Scope of Work
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A special study will use base cases compiled from the Base Case Compilation Schedule. Special study
requestors should identify the base cases to be used for the study and any desired modifications. If a
base case from the Base Case Compilation Schedule does not provided a sufficient starting point for
the study, the requestor should participate in the Base Case Compilation Schedule process and help
identify the desired base case.
Annual Study Program Results Log
Issues identified from the simulation of the Standard Disturbances on approved WECC base cases will
be tracked as an Annual Study Program Results (ASPR) log item. The following describes the general
use of the Annual Study Program Results:
1. The ASPR log will be posted on the WECC website and appended to the Annual Study
Program Report.
2. The SRWG will report the ASPR log to TSS, and subsequently TSS to PCC.
3. ASPR Log item removal
a.
b.
c.
Removal of a log item does not require SRWG, TSS, and PCC approval.
Corrective actions should be demonstrated to SRWG.
Informative presentation of log item removals will be provided to TSS and PCC.
Approved By:
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Approving Committee, Entity or Person
Date
SRWG
March 18, 2015
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