Joint Transmission Planning Base Case Preparation Process

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1 California Independent System Operator & Southern California Edison Joint Transmission Planning Base Case Preparation Process NERC Reliability Standard MOD Version 1.2 August 31, 2017

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3 Table of Contents I. Introduction... 1 II. SCE s Master Base Cases... 2 A. Data Requirements... 2 B. Steady State Data... 3 C. Dynamic Data... 4 D. Short Circuit Duty Data... 4 E. Generator Owner Procedures... 4 F. Base Case Schedule to Submit Data to WECC... 4 III. Roles and Responsibilities... 5 A. Master Base Case Development... 5 B. Generation Interconnection Planning s (GIP) Base Case Roles and Responsibilities: Generation Interconnection Planning Base Cases New Generation and Interconnection Facilities: Network Upgrades or SPS for Interconnecting Generators... 9 C. Reliability Planning s (RP) Base Case Roles and Responsibilities: Prepare and Update Transmission Planning s ATRA Base Case Reliability Planning s ATRA Base Cases: D. Intertie Planning s (IP) Base Case Roles and Responsibilities: E. CAISO S Roles and Responsibilities F. PTO or non-pto Roles and Responsibilities Initial Base Case Data Submittal WECC s Base Cases for Base Case Review G. Base Case Submittals to WECC IV. Revision History Appendices Appendix A DATA PREPARATION AND DATA VALIDATION Appendix B WECC BASE CASE PREPARATION A. WECC Initial Base Case Compilation B. WECC Final Base Case Review C. SCE Base Case Retention Requirements Appendix C WECC Base Case Development Checklist Appendix D CAISO sign-off sheet for WECC Base Case review Appendix E Anchor Data Set (ADS) Page i

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5 I. Introduction The purpose of the Transmission Planning Base Case Preparation Process (Process) is six fold. The first, as required by NERC Reliability Standard MOD-032 (MOD-032), Requirement 1, is to provide a jointly developed process for California Independent System Operator s (CAISO) (as Planning Coordinator (PC) and Balancing Authority (BA)) and Southern California Edison s (SCE) steady-state, dynamics, and short circuit modeling data requirements and reporting procedures for the PC planning area. Second, this Process will demonstrate and help support how CAISO, SCE, and Participating Transmission Owner s (PTO 1 ), including: Resource Planners, Transmission Owners, Transmission Planners, and Transmission Service Providers meet MOD-032 and WECC s Data Preparation Manual requirements. The CAISO is the PC and BA for PTOs and Transmission Planners located in area 24 of the WECC base cases, which includes, but not limited to: SCE, MWD, City of Anaheim, City of Azusa, City of Banning, City of Colton, City of Pasadena, City of Riverside, and City of Vernon. This process was developed in accordance with MOD-032, Requirement 1, as follows: Provide guidance to model the data listed in Attachment 1 of MOD-032. Provide specifications of the following items consistent with procedures for building the Interconnection-wide case(s): o Data format; o Level of detail to which equipment shall be modeled; o Case types or scenarios to be modeled; and o A schedule for submission of data at least once every 13 calendar months. Provide specifications for distribution or posting of the data requirements and reporting Provide procedures so that they are available to those entities responsible for providing the data. Third, as required by MOD-032, Requirement 2, this process provides guidance to: each BA (including non-pto entities in area 24 of the WECC base cases), Generator Owners, Load Serving Entities, Resource Planners, Transmission Owners, and Transmission Service Providers that shall provide steady-state, dynamics, and short circuit modeling data to its Transmission Planner(s) and Planning Coordinator(s) according to the data requirements and reporting procedures developed by its Planning Coordinator and Transmission Planner in Requirement R1. 1 Per CAISO, a PTO is defined as a Transmission Owner that enters into a Transmission Control Agreement (TCA) with CAISO and places its transmission assets and Entitlements under CAISO s operational control in accordance with the agreement. For the latest List of Participating Transmission Owners, refer to the CAISO s public website. Page 1

6 Fourth, as required by MOD-032, Requirement 3, upon receipt of written notification from its Planning Coordinator or Transmission Planner regarding technical concerns with the data submitted under Requirement R2, including the technical basis or reason for the technical concerns, each notified Balancing Authority, Generator Owner, Load Serving Entity, Resource Planner, Transmission Owner, or Transmission Service Provider shall respond to the notifying Planning Coordinator or Transmission Planner as follows: Provide either updated data or an explanation with a technical basis for maintaining the current data; Provide the response within 90 calendar days of receipt, unless a longer time period is agreed upon by the notifying Planning Coordinator or Transmission Planner. Fifth, as required by MOD-032, Requirement 4, CAISO or its designee shall make available models for its planning area reflecting data provided to it under Requirement R2 to WECC (Electric Reliability Organization (ERO) designee) to support creation of the Interconnectionwide case(s) that includes the CAISO s planning in area 24 of the WECC base cases). Sixth, this Process establishes consistency amongst various CAISO and SCE Planning base cases utilized for compliance with NERC Standards applicable to Planning Coordinators and Transmission Planners and includes controls to ensure data accuracy and fidelity to base case objectives by use of checklists and formal reviews. The CAISO shall make this base case process available to all the PTOs and non-ptos in area 24 of the WECC base cases by or posting on CAISO s public website. II. SCE s Master Base Cases Data Requirements (MOD-032, R1, R2, & R3): A. Data Requirements This section provides the data format and content requirements for development of SCE s master base cases. Refer to Appendix A, Data Preparation and Data Validation, and WECC s latest approved DPM for further detailed modeling requirements. PTOs and non-ptos, including Generator Owner, Load Serving Entity, Resource Planner, Transmission Owner, or Transmission Service Provider shall provide their data to SCE and CAISO to be modeled into WECC s base cases in accordance with the WECC Base Case Compilation Schedule or revised schedule/dates as communicated by WECC. WECC will send request letters to PTOs and non- PTOs who are on WECC s Technical Studies Subcommittee (TSS) distribution list. The aforementioned shall provide their data as specified in the below data requirements that is consistent with the interconnection-wide process and in accordance with MOD-032. Refer to Appendix A and WECC s latest approved DPM for further details. This data will be incorporated Page 2

7 into SCE s master base cases, which will be used by CAISO and SCE transmission planning groups to develop additional base cases for their respective studies. These requirements are for establishing consistent system models amongst SCE s Transmission Planning groups and CAISO to support analyses of CAISO s footprint, SCE s transmission system, and WECC s interconnection-wide transmission system, and they help avoid potential solution problems. The following guidelines shall be followed to meet the NERC Reliability Standard, MOD-032. Appendix A and WECC s latest approved DPM address each data type requirements. If the Short Circuit Duty (SCD) data format is from a program other than PSLF or PowerWorld, then this data shall be provided to SCE in the separate format (e.g., Aspen or Cape). Upon request, SCE shall provide the SCD data within an agreed upon timeframe for the purposes consistent with the interconnection wide process. B. Steady State Data Transmission Facilities: With the exception of collector-based generation such as wind and solar, all Bulk Electric System elements, as presently defined by NERC, within SCE s system shall be represented in SCE base cases without equivalency. The facilities are expected to be in-service in the month and year represented by the case. ISO approved facilities that are specifically needed to mitigate conditions which exceeds transmission planning criteria and NERC reliability standards. Existing transmission facilities. If necessary, Non-Bulk Electric System elements must follow the same submittal requirements for the Bulk Electric System elements. o Any equivalency of non-bulk Electric System elements shall be modeled to yield similar results as a full representation in both static and dynamic analysis o Non-Bulk Electric System Generation shall, at a minimum include, but are not limited to: Facilities with connected individual generation resources 10 MVA or aggregate generation resources 20MVA Facilities with connected reactive resources 10 MVAR The data requirements should be consistent with WECC s latest approved DPM and NERC Reliability Standard MOD-032. Refer to Appendix A and WECC s latest approved DPM for further requirements. Page 3

8 C. Dynamic Data To provide consistency in data submittals and help avoid potential simulation problems, the guidelines of WECC s latest approved DPM and Appendix A shall be followed prior to each submittal. In all cases, dynamic data must match with steady-state data provided for each SCE base case (i.e., bus name and number, voltage, and MVA, must be the same for both power flow and dynamic modeling). D. Short Circuit Duty Data Short circuit data is necessary to perform a several studies such as breaker duty evaluation and relay coordination. The necessary data includes the zero, positive, and negative sequence data of transmission lines but also includes but not limited to the generator characteristics and transformer winding connections. a. Positive Sequence b. Negative Sequence c. Zero Sequence d. Mutual Coupling Line Impedance e. Transformer Winding Connections E. Generator Owner Procedures Any Generator Owner within area 24 of the WECC base cases shall provide modeling data in accordance with NERC Reliability Standards, the WECC Data Preparation Manual, and the WECC Generating Unit Model Validation Policy to SCE and the CAISO according to the periodicity in the NERC Reliability Standards (MODs 025, 026, & 027 & PRCs 19 & 24) and WECC Generating Unit Model Validation Policy. Upon receipt of this data from generator owners and after usability is confirmed by SCE, these models will be modeled in both the power flow base cases and WECC s dynamic data file, as needed. Data Requirements (MOD-032, R4): F. Base Case Schedule to Submit Data to WECC SCE, PTOs, and non-ptos located in area 24 of the WECC base cases will coordinate to develop a base case that represents each entities system in a WECC full-loop base case which supports the creation of the Interconnection-wide cases(s). Each PTO and non-pto located in area 24 of the WECC base cases, including: Resource Planners, Transmission Owners, Transmission Planners, and Transmission Service Providers shall submit their data to SCE and CAISO in accordance with the WECC Base Case Compilation Schedule or revised schedule/dates as communicated by WECC; that is if changes are made to their base case models. Upon receipt from PTOs and non-ptos data in area 24 of the WECC base cases in CAISO planning area, SCE Page 4

9 will model the data and submit a full-loop base that incorporates SCE s, PTOs and non-ptos data to WECC. These base cases will be submitted to WECC and CAISO in accordance with the WECC Base Case Compilation Schedule or revised schedule/dates as communicated by WECC. When an issue of submittal timing warrants extending the deadline, SCE may modify the due dates, not to exceed 15 calendar days, by an agreed upon extension between the Southern California Area Coordinator, WECC, or the CAISO. III. Roles and Responsibilities A. Master Base Case Development The master base case, also known as SCE s WECC Master Base Cases, shall be used as the starting base case for each WECC and ATRA base cases. SCE develops and maintains three WECC Master Base Cases, a 1 year out, 5 year out, and 10-year out case. The following provides the process to develop the common base case: 1. Annually, SCE s Reliability Planning (RP) shall compare an approved WECC base cases with SCE s Master base cases to develop the ATRA bases cases. 2. Any updates to the ATRA cases shall be coordinated between IP and GIP for any necessary changes. 3. RP shall send the updated ATRA base cases to the WECC base case preparer (Preparer). 4. The Preparer shall then compare the updated ATRA base cases with SCE s latest WECC Master Base Cases and resolve any discrepancies between the cases. 5. Any discrepancies resolved between RP and Preparer will be incorporated into the ATRA base cases and SCE s WECC Master Base Cases, based on the month and year represented by the cases. 6. The updated SCE WECC master base case shall be posted on the transmission planning s share drive. 7. The Preparer shall maintain SCE s WECC master base cases throughout the year. 8. The Preparer shall maintain a log file of all changes to the master base cases and will provide it to the ISO when requested. The WECC master base cases shall be evaluated and validated on an annual basis for SCE owned facilities. This shall include, but not limited to: - Latest transmission system topology - Transmission line and transformer Impedances - Transmission line and transformer facility Ratings - Dynamic models - Latest generation interconnection information - WECC s Rep Log Items Page 5

10 Refer to Appendix A Data Requirements and Data Validation for detailed data modeling requirements. These data requirements were extracted from the current WECC DPM. The tables in this appendix provides power flow and dynamic data requirements. Roles and Responsibilities Responsible entities Intertie Planning Generation Interconnection Planning Roles Develop master base cases. Maintain master base cases. Incorporate project files developed by Transmission Planning groups on an as needed bases.* Notify RP and provide change files for CAISO identified base case changes during WECC base case review process. Prepare Generation Interconnection Studies base cases from the ATRA base cases. Coordinate any base case changes with RP which in turn will coordinate with Intertie Planning as part of their process. Develop and provide project files, including powerflow and dynamic data, for any sponsored projects that will be modeled in the master base cases to RP and IP Preparer. Notify IP and provide change files for CAISO identified base case changes during Generation Interconnection process. Reliability Planning Annually prepare the ATRA base cases. Provide the ATRA base cases to the Preparer. Notify IP and GIP of any changes to the ATRA base cases and provide a change file to the Preparer in an EPC or EPCL format. Develop and provide project files for approved CAISO transmission projects to the Preparer. Notify IP and provide change files for CAISO identified base case changes during TPP process. * Project files for incorporating into the master base cases shall follow the requirements as identified in Appendix A. Page 6

11 Transmission Planning Modeling Assumptions Base Case Models Intertie Planning Reliability Planning Generation Interconnection Planning CAISO TPP Generation Model generation inservice, under construction, or on an as needed bases Per CAISO Study TPP Study Plan Populate PMAX2 with NQC Consistent with all applicable Interconnection Procedures Per CAISO TPP Study Plan (generally the same as Reliability Planning) Transmission Facilities Including, but not limited to: Existing CAISO controlled Facilities CAISO approved transmission projects Including, but not limited to: Existing CAISO controlled facilities CAISO approved transmission projects Consistent with all applicable Interconnection Procedures Per CAISO TPP Study Plan (generally the same as Reliability Planning) Load Forecast CEC 1-in-2 year load forecast. CEC Forecast 1 in 10 year load forecast for peak cases, off-peak cases varies Explicit additional achievable energy efficiency load models Based on ATRA base case utilized as directed by CAISO. Per CAISO TPP Study Plan (generally the same as Reliability Planning) Demand Response (voluntary load shed) Page 7

12 Base Case Models Intertie Planning Reliability Planning Generation Interconnection Planning CAISO TPP Project Files 1. Future planned projects up to 10 years. Coordinate with RP and GIP to obtain the latest files. 2. Incorporate changes or projects into the appropriate WECC base case. Upon IP s request, provide updates on future projects or provide any corrections to the base cases. Update the GIP depository on an ongoing basis every time updated data is provided by the Interconnection Customer (IR, MMA, preliminary Engineering, and Final Engineering, As-Built) for any future planned projects. Provide change files to CAISO as soon as possible Scenarios Per CAISO TPP Study Plan (generally the same as Reliability Planning) Per CAISO GIP Study Plan Per CAISO TPP Study Plan (generally the same as Reliability Planning) Schedule Annually for 10 years planning horizon Annually at least for five years horizon Annually for 10 years planning horizon B. Generation Interconnection Planning s (GIP) Base Case Roles and Responsibilities: 1. Generation Interconnection Planning Base Cases GIP base cases shall start from the Reliability s (ATRA) base cases. If GIP Planners discover a discrepancy in the technical parameter of existing facilities such as impedance, facility ratings, and transmission line topologies, GIP Planners shall inform RP Planners to address the discrepancy. Reliability Planning shall then inform Intertie Planning of changes so that updates, in either an EPC or EPCL format, can be implemented into the master base cases. Changes to GIP base cases submitted to external entities will be addressed in the corresponding study reports issued as part of the GIP study process. GIP shall retain a copy of the s that transmitted the base cases to CAISO and shall obtain confirmation from CAISO that the base case(s) was/were received for NERC compliance evidence. Page 8

13 GIP base case assumptions for GIP studies are identified in the CAISO GIP study plan. These base cases are modified to include transmission and generation facilities in accordance with the GIP study process and shall only be provided for GIP studies or base cases. 2. New Generation and Interconnection Facilities: The following provides the roles and responsibilities for Transmission Planning s Groups to model new or existing generators. a. GIP will update the progress of queued generation in the Generator Interconnection Planning Project Data Depository and will notify the Preparer and RP of the status of new projects when requested. For example, generators in-service or under construction will be modeled in the base cases. Also, if generator projects are placed in-service in phases, the Preparer will model the generators with respect to the commercial operation date of each phase. b. GIP is responsible for reviewing the initial design, final engineering, and As-Built data for the interconnection customer generating facilities, to be provided by the Interconnection Customer in accordance with executed GIAs. c. The following is required by the WECC Generating Unit Model Validation Policy: Generator Owner Responsibilities Generating Facility Data The Generator Owner shall provide to the Transmission Planner the information for the Generating Facility as specified in the WECC s Generating Facility Data Requirements document. The Generator Owner shall review, verify, and update the Generating Facility data no later than 180 days after the new Generating Facility is released for Commercial Operation. Intertie Planning will assume the responsibility of monitoring the status of the generator s test data per the WECC Generating Unit Model Validation Policy which is required as stated above 180 days after commercial operation. 3. Network Upgrades or SPS for Interconnecting Generators a. The status updates of transmission facility upgrades will be maintained by GIP (or project sponsor). The responsible GIP project sponsor shall post the changes on the Generator Interconnection Planning Project Data Depository and will notify the Preparer on a monthly bases of any changes to network upgrades, including upgrades that are placed in service. These upgrades include, if any, but not limited to: impedances, facility ratings, line distances, and locations. b. Any SPS that are associated with new generation projects and are included in GIAs are the responsibility of GIP. The project sponsor must obtain approval from WECC s RASRS. Once the approval is granted and the SPS is placed in-service, it will be the responsibility of the Reliability Planning group to continue assessments (excluding any modifications associated with subsequent new generation projects). Page 9

14 c. GIP will update and maintain SCD data for new generation projects and associated transmission facilities until such upgrades are placed into service and as-build information is provided. Any future changes to upgrades not driven by generation interconnection requests will be updated and maintained by the appropriate organization where the modification need is identified. d. In addition to generators that are already in-service, new generators will be modeled in the base cases, on an as needed basis. C. Reliability Planning s (RP) Base Case Roles and Responsibilities: 1. Prepare and Update Transmission Planning s ATRA Base Case a. On an annual basis, RP shall prepare the ATRA base cases that the Preparer will use to update SCE s latest WECC Master Base Cases. b. The RP group will monitor the progress of reliability-driven projects and provide the following to the Preparer: 1) updates or corrections to existing transmission facilities, 2) project files for newly approved transmission and generation facilities. Transmission facilities include: transmission lines, transformers, loads, reactive support devices (e.g. shunt capacitors and reactors, series capacitors, SVCs, SVDs, synchronous condensers, etc), special protection schemes, and other power system devices. Project files shall include simulation models with associated parameters (impedances, ratings, and susceptance), location, distance, and plan of service, and 3) confirmed review comments and change files developed as part of CAISO TPP Planning base case development work. RP will provide these materials to the Preparer. c. RP shall concurrently notify the Preparer, GIP planners, and CAISO of any data correction changes and subsequently send a change file to make those changes. 2. Reliability Planning s ATRA Base Cases: RP will review generator projects from the GIP s database for status updates and determine which projects shall be included into the ATRA base cases. On an as needed basis, the Preparer will request updates on RP s project files that will be incorporated into the master base case. Upon receipt of this request, the responsible RP project sponsor shall post the changes in an EPC or EPCL format on the Transmission Planning s share drive and will notify the Preparer by of these changes. The status of updates to transmission facilities will be maintained by RP (or project sponsor). Once the network upgrades are placed in service or approved by CAISO, RP or the project sponsor will provide project updates to the Preparer, if any, of the new transmission facilities parameters including impedances, facility ratings, line distances, and locations. For NERC compliance evidence, the planner submitting these base cases to CAISO (via CAISO secure website) shall request a confirmation from CAISO that they received the base cases. Page 10

15 D. Intertie Planning s (IP) Base Case Roles and Responsibilities: The Base Case Preparer will be responsible for preparing and submitting WECC base cases to WECC (ERO or its designee). Each WECC base case will be developed from one of SCE s WECC master base cases. The Preparer will maintain the master base cases and coordinate with the Transmission Planning groups to ensure that the latest modeling data for existing and future facilities are reflected in these master base cases. The Preparer will coordinate with the responsible planners who are providing the models and ensure, that they meet all applicable NERC Reliability Standards and WECC Policies prior to modeling in the master base cases. The Preparer shall also coordinate with CAISO to ensure that the WECC ADS base case meets data requirements. 2 The Preparer shall coordinate with the transmission planning groups and perform an annual review of the latest master base cases. This review shall include comparing the latest WECC master base cases with the ATRA base cases. The review shall consist of validating ratings, impedances, topology, and updating dynamic data models. The Responsible Planner will maintain project files with the latest in-service dates and provide them to the Preparer for inclusion into the WECC base cases based on the month and year represented by the case. The Preparer will review generator projects for status updates and determine which projects shall be included in the WECC base cases based on the month and year represented by the case. E. CAISO S Roles and Responsibilities Every year CAISO posts the CAISO Transmission Planning Process Study Plan developed along with the stakeholders. CAISO planners review the study plan with RP and kicks off the Transmission Planning Process. The reliability assessment is performed on the bulk system and the local areas for 10 years planning horizon to ensure that the performance of the system under the CAISO controlled grid will meet or exceeds the applicable reliability standards. TPP base cases shall start from the latest ATRA base cases. The ATRA case shall include up-todate information of the existing facilities, future generation, and transmission projects for the next 10 year horizon. RP will provide a list of renewable projects that are either under construction or recently went in to service to the CAISO Planners. RP will model and dispatch these renewable projects pursuant to the ISO Study Plan. RP will provide a list of all additional and retirements of generation, transmission, and other projects that will be modeled in the planning cases. CPUC provides the CAISO with the RPS portfolios to be used in the TPP annually. CAISO Planners will compare the RP and CPUC list and identify the additional projects that needs to be modeled to meet the Renewable Portfolio Standard (RPS) requirements. CAISO Planners will provide to RP the list of additional generation that needs to be modeled in the ATRA base case and a list of any new conventional generation resources, as per CAISO study plan, that needs to be modeled. RP will model this additional RPS renewable generation and dispatch these renewable generators pursuant to the ISO Study Plan. CAISO Planners will also communicate this list of 2 Refer to Appendix E for further details on Anchor Data Set development. Page 11

16 additional projects that need to be modeled to meet the RPS requirements to the Preparer, to be modeled in the WECC ADS 3 base case. CEC will post 1-in-10 demand forecast and provide allocation of Additional Achievable Energy Efficiency (AAEE) to bus-bar locations. RP will updates the seed ATRA base cases according to the Study Plan incorporating topology changes, CEC load forecast, CEC allocation of AAEE, path flows, and CAISO new resources. RP will develop dyd files, p1-p7 contingency files (categorized as much as practicable), A bank load forecast tables, and switch deck files and will provide this information to CAISO. RP will ensure that the provided DYD files with renewables included will have a flat no fault run. CAISO Planners will review the provided information and communicate back any concerns identified in the base case to RP via written comments. SCE will update the current ATRA and SCE WECC Master Base Cases, as needed, to address CAISO s written comments. Once the outstanding concerns are resolved, if any, CAISO will merge SDGE base case with the SCE base case and will build the full loop base case as specified in the CAISO study plan. CAISO will work with SDGE to obtain their TPP base case to be merged with SCE. RP will provide the bulk system and the local area base cases for the years in the study plan and CAISO Planners will start the TPP study. F. PTO or non-pto Roles and Responsibilities 1. Initial Base Case Data Submittal a. Each PTO or non-pto in area 24 shall provide their system load forecast to SCE and CAISO on an annual basis by June 1 of each year, or submit their loads for each WECC base case scenario in accordance with the WECC Base Case Compilation Schedule or revised schedule/dates as communicated by WECC. b. If changes are needed to the base case models, PTOs and non-ptos shall submit their data to the responsible SCE transmission planner and CAISO in accordance with the WECC Base Case Compilation Schedule or revised schedule/dates as communicated by WECC for the requested WECC base case scenario. c. Generator Owners within area 24 of the WECC base cases shall submit their data to SCE and CAISO, if applicable for the base case scenarios, if changes are needed to the base case. d. APS/SRP, SDG&E, CDWR, VEA, IID, WAPA, LADWP, MWD, NVE, and PG&E shall submit the necessary interchange or pump load data in accordance with the WECC s Annual Study Program Compilation Schedule. e. SCE will adjust the load forecast to meet the base case scenario request. 3 Refer to Appendix E for further details on Anchor Data Set development. Page 12

17 f. All data submittals shall be provided to SCE at and CAISO at 2. WECC s Base Cases for Base Case Review PTO and non-ptos have the opportunity to provide review comments and the appropriate signoff sheet(s) for each WECC base case review request. SCE will send an notice to remind PTO and non-ptos for their comments and appropriate signoff sheet(s) for each WECC base case review request. Theses review comments must be received by SCE prior to the stipulated deadline in-order for them to be incorporated into the base case. There are two options for submitting power flow and dynamic data. These options are consistent with the interconnection-wide process. Option 1: (Without PSLF) The power flow data are available in GE PSLF format on the WECC website ( Step 1: Step 2: Step 3: Step 4: Step 5: Step 6: Step 7: Step 8: Step 9: On the main page, enter your login information. Click on base cases in the popular searches panel. Select the year of the base case. Click the appropriate base case for review. Click on the base case supplemental.zip file. Click on the appropriate base case SCE.xls excel file. Review the appropriate worksheet for SCE Interchanges, Pumpload, Loads, and/or Generation. Download the signoff sheet(s) in the appropriate base case for review link. Check the appropriate Data Comment on the signoff sheet(s) and send the signoff sheet(s), via , to CAISO and SCE. If a change is needed, check the appropriate box and send the change in a text format, via , with the signoff sheet(s). Option 2: (With PSLF) Step 7B Step 9B Follow the above steps and add Step 7b to download the base case and review. If a change is needed other than revising the load or generation dispatch (e.g. line rearrangement or new transmission facilities), provide a change file (epcl or epc format) or the base case to SCE, and a description of the change in text format. G. Base Case Submittals to WECC SCE is responsible for submitting WECC base cases and review comments for Area 24 to the Southern California Area Coordinator or, if SCE is the area coordinator, to WECC in accordance with the WECC Base Case Compilation Schedule or revised schedule/dates as communicated by WECC. When an issue of submittal timing warrants extending the deadline, SCE may modify the due dates, not to exceed 15 calendar days, by an agreed upon extension between the Page 13

18 Southern California Area Coordinator, WECC, or the CAISO. SCE will provide the initial base cases to CAISO for review and comment. The CAISO will review SCE base case data and provide comments to SCE during the Base Case Review Process 4. SCE will provide written response to the CAISO, using the case review sign-off sheet in Appendix D, confirming that the WECC Base Case has been updated to address CAISO s review comments or provide an explanation for maintaining the current data. SCE will provide base case data or review comments for Area 24 to the Southern California Area Coordinator or, if SCE is the area coordinator, to WECC. If SCE provides the base case data or review comments for Area 24 to the Southern California Area Coordinator, the Southern California Area Coordinator will provide the base case data or Review Comments to WECC. In addition, SCE and CAISO will keep documentation records for a minimal of four years. 4 The ISO, in agreement with SCE, has developed a case review sign-off sheet for providing WECC Base Case Review comments to SCE (Appendix D) Page 14

19 The California Independent System Operator (CAISO) & Southern California Edison (SCE) Joint Transmission Planning Base Case Preparation Process (Joint Base Case Process) each entity s individual and joint responsibilities for implementing Requirement 1 and its sub-requirements of the NERC MOD Reliability Standard. These individual and joint responsibilities were determined by the ISO and SCE, and are identified in the Joint Base Case Preparation Process document, which was developed in 2014 and 2015 through conference calls and exchanging information held between the CAISO and SCE. The Parties signing this procedure document agree that accurately identifies their respective roles and responsibilities for implementing Requirement 1 and its sub-requirements for MOD Original Signed by: August 30, 2017 Robert Sparks Date California ISO, Manager, Regional Transmission-South, Infrastructure Development Ayman Samaan SCE, Engineering Manager, Transmission Intertie Planning August 30, 2017 Date Page 15

20 IV. Revision History Version No. Description Date 1.0 Initial Document July 1, Minor edits for clarity and to ensure compliance obligations Minor edits to ensure compliance obligations and to accommodate the WECC Anchor Data Set requirements July 1, 2016 August 31, 2017 Page 16

21 Appendix A DATA PREPARATION AND DATA VALIDATION The modeling requirements in Appendix A were extracted from the current WECC DPM. Where there are differences between Appendix A and the latest approved WECC DPM, the latest approved WECC DPM shall be followed with the exception of following Generating facilities less than 10 MVA may be model explicitly or aggregated. Aggregated generation capacity that is 20 MVA or larger, and is connected to the WECC transmission system at 60 kv or higher, and is a collector based generation facility, then steady-state data and dynamics data shall be submitted for the generation facility as a single-unit generator model or multiple-unit generator models. (Wind and solar farms are an example of a collector-based generation facility.) A. Base Case Preparation AC and DC Buses a. Buses usually represent all of the equipment in a substation that is at the same voltage level and is connected together. If desired, multiple bus sections within a substation can be represented by separate buses connected by Connectors or AC Transmission Line models that can be opened or closed as needed. Buses may also represent a node on a transmission line such as a tapping point or change in ownership. b. Location of the bus will be identified by the combination of Area, Zone, and/or Owner fields. Optionally, the latitude and longitude fields can be submitted using decimal degrees with data entered not to exceed five decimal places. c. See Appendix A, Table 1: Data Requirements (Buses) for further modeling details. Generators a. Modeling of generators shall comply with the following: i. If the individual generator unit capacity is 10 MVA or larger, and is connected to the WECC transmission system at 60 kv or higher, then steady-state data and dynamics data shall be submitted for each generator. ii. If the aggregated generator unit capacity is 20 MVA or larger, and is connected to the WECC transmission system at 60 kv or higher, and is not a collector based generation facility, then steady-state data and Page 17

22 dynamics data shall be submitted for each generator. (Wind and solar farms are an example of a collector-based generation facility.) b. Steady-state and dynamic generator data shall be consistent. c. Synchronous motors 10 MVA and larger shall be modeled as individual machines, using a generator model with negative Real Power Output and constant Reactive Power (Q) output. d. Induction motors shall be modeled as a load with the intent of using an induction motor model (MOTORW). e. Synchronous condensers shall be modeled individually using a generator model. f. Generator step-up transformers shall be modeled explicitly; therefore they shall not be modeled using the internal generator step-up transformer feature of a generator model. All related parameters shall be set to the default values. See Data Requirements (Transformers). g. Station service loads (ID = SS ) shall be represented explicitly as separate loads on the generator bus. See Data Requirements (Loads). h. Wind and photovoltaic plants shall be represented through an equivalent generator(s), equivalent low-voltage to intermediate-voltage transformer, equivalent collector system, and substation transformer between the collector system and the transmission bus. See the WECC Wind Power Plant Power Flow Modeling Guide and PV Plant Power Flow Modeling Guide. i. Large industrial sites may include imbedded generation. Industrial generators 10 MVA and larger shall be represented in power flow instead of netting with the total load. If a generator is connected to the low side of the bulk power delivery transformer, then the transformer must be represented in the power flow, and the generator and load must be connected to the low-voltage side of the transformer. j. Generator maximum real power Pmax in power flow must be consistent with the turbine capabilities defined in the Master Dynamics File. k. Generator data shall be extracted from generator test reports or data obtained from generator owners. l. See Appendix A, Table 2: Data Requirements (Generation) for further modeling details. Transmission Lines (AC) a. Series connected reactive devices modeled in AC Transmission Lines shall be explicitly modeled. b. AC Transmission Line models connecting two areas as defined by WECC shall be maintained in the Master Tie-Line File. c. When breakers are explicitly represented in the model, they should be modeled as Breakers with the Connector Type field set to Breaker (To be implemented in PSLF). Page 18

23 d. AC transmission lines modeled with impedance below X = p.u. (the threshold impedance in PSLF) shall not be used to represent a closed loop (ring bus representation). e. Normal and emergency thermal rating fields for the seasonal scenario described in the base case data request letter shall be populated for all AC Transmission Line models. f. Line connected transformers shall not be modeled using the internal line connected transformer feature of a transmission line model; all related parameters shall be set to the default values. See Data Requirements (Transformers). g. Data for AC lines will consider the length of the line when calculating line parameters. For example, long lines will be modeled with impedances adjusted to account for the uniform distribution of the series impedance and shunt admittance along the length of the line. h. Obtain the limiting component or facility ratings of a transmission line from the CAISO Transmission Registry. i. If available, obtain transmission line impedances from the GCC 525 KV and 230 KV Impedance Diagrams. j. Appendix A, Table 3: Data Requirements (AC Transmission) for further modeling details. DC Transmission Lines a. Include (at a minimum) the following DC Transmission Line (overhead and underground) requirements: line parameters, Normal and Emergency Ratings, control parameters, rectifier data, and inverter data. b. MW set-point of converter data shall be equal to or less than the DC Transmission Line Rating. c. Appendix A, Table 4, Data Requirements (DC Transmission) for modeling details. Transformers a. Transformers with no Tap Changing Under Load (TCUL) or phase-shifting capability shall have the Tap Control Type field set to 1 and shall not have TCUL or phase-shifting data included in the cases. Conversion from the latest approved version of PSLF to other widely used programs may create model discrepancies with partial TCUL or phase-shifting data. b. Transformer data may be entered on either the transformer base (transformer winding MVA base and winding voltage base) or the system model base (100 MVA and system nominal voltage base). Impedance values and tap position values shall use a consistent unit base value for a given transformer. c. Transformer models connecting two Areas, as defined by WECC, shall be represented in the Master Tie-Line File. Page 19

24 d. Normal and Emergency thermal rating fields corresponding to the seasonal scenario described in the base case data request letter shall be populated for all Transformer models. e. The Transformer Impedance Correction Table shall be maintained in the Master Tie-Line File. f. Obtain Transformer Thermal Facility Ratings from SCE SOB No. 33. g. See Appendix A, Table 5, Data Requirements (Transformers). Fixed Shunt Reactive Elements a. Represent fixed shunt elements that are directly connected to a bus as bus shunts. b. Represent fixed shunt elements that directly connect to and switch with a transmission line as line shunts. c. Fixed Line Shunt models connected to an AC Transmission Line model connecting two Areas as defined by WECC shall be represented in the Master Tie-Line File as well as in case data. d. Fixed shunt reactive devices inside wind and solar projects must be modeled explicitly in power flow. e. See Appendix A, Table 6, Data Requirements (Fixed Shunts) Controlled Shunt Reactive Devices a. Controlled shunt reactive devices models should be used to represent the following devices explicitly in power flow: i. Mechanically switched shunt capacitors and reactors; ii. Static VAR Compensators; iii. STATCOMs; and/or iv. Thyristor switched shunt capacitors and reactors. b. Controlled shunt reactive devices inside wind and solar projects must be modeled explicitly in power flow. c. The number of explicitly modeled shunts on a bus should be minimized to aid solving d. See Appendix A, Table 7 Data Requirements (Controlled Shunts) Loads General Requirements a. Use the CEC Load Forecast and distribute amongst SCE s A-Banks, reference SCE s Transmission & Interconnection Planning Load Forecast Methodology The below diagram demonstrates the load forecast methodology: Page 20

25 b. Real and reactive power for each load shall be provided. c. Motors 10 MVA or larger shall be modeled as machines. d. Station service at modeled generation facilities with station service load greater than or equal to 1 MW shall be modeled explicitly. Generator station service load models shall have their Load ID set to SS. e. A Long ID shall be provided for each load in accordance with the WECC MVWG Load Long ID Instructions (LID Instructions), either within the case data provided, or in a separate spreadsheet file. Data Submitter shall select an appropriate Long ID that correctly represents the Dynamic load characteristics. f. Industrial loads and embedded generation shall be modeled on the low side of the transformer, as shown in the following figure: 115-kV 10 MW WRONG! Industrial load is netted with embedded generation 115-kV G 90 MW 100 MW WRONG! Industrial load and embedded generation are connected to high voltage bus 115-kV 13.8-kV G 90 MW 100 MW RIGHT! Industrial load and embedded generation are connected to low voltage bus Page 21

26 g. See Appendix A, Table 8, Data Requirements (Loads) Dynamic Data Approved dynamic models conform to the WECC Dynamic Modeling Procedure. All dynamic models contained in the MDF shall be those approved by MVWG. If the model you want to use is not on the approved list, you must go through MVWG and follow the WECC Dynamic Modeling Procedure. The following approach to dynamic data shall apply Interconnection-wide: a. Generators and other dynamic devices shall be represented with approved dynamic data as recommended by the MVWG to represent the designated dynamic equipment modeled in WECC base cases. The approved models can be found within the Approved Dynamic Model Library. b. Estimated or typical manufacturer s dynamic data based on facilities of similar design and characteristics may be used to represent planned generators and other dynamic devices if specific design data cannot be obtained. MVWG maintains the Typical Machine Data document. Specific dynamic design data shall be submitted per the WECC Steady-State and Dynamic Data Criterion. c. All Generator Models Shall include the following, if applicable: 1. Generator Model Types 2. Governor Models 3. Excitation Models 4. PSS Models The following criteria shall be used to determine when a PSS shall be installed on a synchronous generator, regardless of ownership, that is connected to the transmission system (by generator step-up transformer to 60 kv or higher voltage): i. A PSS shall be installed on every existing synchronous generator that is larger than 75 MVA and is equipped with a suitable excitation system as defined in the report Criteria to Determine Excitation System Suitability for PSS, dated December 1992 (available on WECC Website, ii. A PSS shall be installed on every existing synchronous generator that is larger than 30 MVA, or is part of a complex that has an aggregate capacity larger than 75 MVA, if the excitation system is updated so that it becomes a suitable excitation system as defined in the report mentioned in 1a above. This section applies to all machines whose excitation system is updated at any time after November 18, iii. A PSS shall be installed on every synchronous generator that is larger than 30 MVA, or is part of a complex that has an aggregate capacity Page 22

27 larger than 75 MVA, and is equipped with suitable excitation systems as defined in paragraph 1a, and is commissioned after November 18, d. Underfrequency Load Shedding i. Include under frequency load shedding records for all loads that have under frequency relays on the interconnected system. ii. Ensure the pickup frequency of each stage is lower than that of the previous stage. UFLS must comply with WECC-coordinated off-nominal requirements as specified in the WECC Off-Nominal Frequency Load Shedding Plan document. iii. Include pertinent load data in the MDF. All under-frequency loadshedding data in the MDF must match bus, load, and/or branch identifiers in the cases. iv. Ensure UFLS models provided correspond to UFLS information provided to WECC Under-Frequency Load-Shedding Review Group in accordance with WECC Under-Frequency Load Shedding Criterion. SCD Data Short circuit data is necessary to perform a myriad of studies such as breaker duty evaluation and relay coordination. The necessary data includes the zero, positive, and negative sequence data of transmission lines but also includes but not limited to the generator characteristics and transformer winding connections. 1. Positive Sequence 2. Negative Sequence 3. Zero Sequence 4. Mutual Coupling Line Impedance 5. Transformer Winding Connections 6. Auxiliary transformers / equipment connected at the tertiary (i.e. grounding transformers, series reactors, etc.) Relays Include relay models as approved for use by the RDWG per the time line and scope it establishes for primary relays, e.g., overcurrent relays. Data submitters are also strongly encouraged to submit all relevant backup relay modeling data. Page 23

28 Data Requirements AC AND DC General requirements: Table 1: Data Requirements (Buses) Field Description Requirements Number Bus number B1. WECC staff shall provide DC Bus numbers. Name Base Voltage Bus Type Bus name Alphanumeric string containing 1 to 12 characters At least one nonnumeric character Nominal voltage class of Bus (kv) AC Bus type {0,1,2,-2} 0 = swing bus (voltage magnitude and phase fixed) 1 = load bus (unconstrained voltage angle and magnitude) 2 = generator bus (voltage control [terminal or remote] within generator limits) -2 = generator bus with unlimited reactive power limits Other bus types may be used to indicate OFF status. Bus type -4 and smaller is the accepted convention for deleted buses. B2. Bus names shall be unique within the same Base Voltage class. DC System Number DC Bus type {1,2} 1 = for a rectifier 2 = for an inverter DC system number (not required for AC Bus) B3. WECC staff shall assign a DC system number for each DC system prior to model submission. Page 24

29 Field Description Requirements Schedul ed Voltage Scheduled voltage (pu) 5 decimals Default: B4. If Bus is regulated by a generator or other device, the scheduled voltage shall be specified in per unit with respect to the Base Voltage of the Bus. B5. If Bus is not regulated, the scheduled voltage is optional for information purposes only. Area Bus Area in which Bus is located Zone Bus Zone in which Bus is located Owner Owner Number B6. Owner number shall be the Transmission Owner, Generator Owner, or Data Submitter. B7. WECC staff shall assign Owner Number to required entities. Substati on Substation in which Bus is assigned B8. Buses relative to GIC analysis shall be assigned to a substation Balancin g Authorit y Service Balancing Authority in which Bus I located In or Out of Service Dates B9. All buses shall be assigned to a BA Page 25

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