MVWG Report to TSS May 2014 Stephanie Lu, MVWG Chair Seattle City Light

Recent Meetings PPMDTF Conference Call March 7, 2014 HVDCTF Conference Call March 13, 2014 REMTF Meeting March 18-19, 2014 LMTF Meeting March 19, 2014 MVWG Meeting March 19-20, 2014

MVWG Vice Chair Jun Wen, SCE has been appointed as Vice Chair MVWG member since 2008 Jun Wen is a Senior Power System Engineer at Southern California Edison (SCE) Transmission Strategy and Special Assessment (TSSA). She received her BSEE and MSEE from Tsinghua University in Electrical Engineering, and Ph.D. from University of California with the focus on modern Power Electronics. She has been leading the development of the Centralized RAS project – an IEC based Wide Area Monitoring and Protection system since 2008, she is also an active member at the WECC Modeling and Validation Working Group. Before joining SCE, she was advisor for One-Cycle Control, Inc. and consultant for Aegis Technology. She has published over thirty technical articles and holds one US and International Patent on multilevel converter topology and applications.

MVWG Activities Overview Approval Items Renewable Energy Modeling Approved Dynamics Model List Load Modeling System Model Validation Generator Modeling, Testing, and Validation HVDC Modeling Other items: NERC Updates, WECC Project Updates, RAS/Relay Modeling, Program Updates Next Meetings and Workshops

MVWG Approval Items For TSS Approval: Wind Power Plant Dynamic Modeling Guidelines PV Power Plant Dynamic Modeling Guidelines For TSS Information: Updates to the Approved Dynamics Model List “Model Validation and System Performance Analysis for PDCI RAS Event that Occurred on May 30, 2013” Report

Renewable Energy Modeling

Wind/Solar Implementation Plan DescriptionDate MVWG Approved Model SpecificationsNovember 2012 TSS Approved Model SpecificationsJanuary 2013 Complete WECC-scale model testing with model prototypes (Alpha version)September Hr Webinar: cover policy, model development, expected deployment process November 2013 Release version of commercial software programs (at least PSLF) made available to WECC as Beta version Nov/Dec 2013 Complete drafting of MVWG to provide Application Guidelines with ‘typical’ data from major manufacturers March 2014 Update Approved Dynamic Models List (add updated wind and solar models, and plan for removing obsolete models) March 2014 WECC completes process to release to WECC usersMarch/April 2014 Issue request for entities to submit data using new models into WECC case, with grace period (coordinate with SRWG) Summer 2014 User WorkshopJune 17, 2014 Model Validation Guideline (Newly added to list)Fall 2014?

2 nd Generation Wind Models

Photovoltaic Models Distributed and Small PV Plants = PVD1

Wind and PV Dynamic Modeling Guidelines Guidelines for Wind and PV dynamic modeling were developed and approved by MVWGWindPV Motion: Approve the Wind Power Plant Dynamic Modeling Guidelines Motion: Approve the PV Power Plant Dynamic Modeling Guidelines

REMTF – Next Steps Wind Type 3 torque controller model – reviewing a proposal to keep the more complex model as a separate module Distributed PV model in composite load model  More discussion is needed between REMTF, program vendors and LMTF to implement a distributed PV model in the composite load model CMPLDW Energy Storage Modeling – NEW Plant Level Control Modeling – NEW

Approved Dynamics List

Approved Dynamics Model List MVWG updated the Approved Dynamic Models List with the following  Added the 2 nd generation wind and 1 st generation PV models  Added approval dates In coordination with SRWG implementation plan for new wind models, will remove superseded wt3x and wt4x models REPC_A – Plant controller for PV, WT3/4 REEC_A – Electrical controls for WT3/4 REEC_B – Electrical controls for PV REGC_A – Generator/Converter for PV, WT3/4 WTGT_A – Drive Train for WT3/4 WTGA_A – Aerodynamics for WT3 WTGP_A – Pitch control for WT3 WTGQ_A – Torque control for WT3 PVD1 – new model for small PV

Status of Model Development Model DescriptionModel Name Model Spec Approved? User Guide Available? WECC Approved? Composite load modelCMPLDWNeed to postXX 1 st generation windWTxx modelsXXX Over excitation modelOEL1PSLF Manual- X SVS modelsSVSMO1, 2, 3XXX Generator modelGENTPJX-X Overcurrent relay modelLOCTI & TIOCRSXSee Model SpecX Volt and freq ride throughLHVRT, LHFRT--X Hydro turbine governor modelH6BX-X 2 nd gen wind/1 st gen PVRExx and WTGxx modelsXXX Distributed PV modelPVD1XXX Directional Overcurrent relayTIOCRS (revision)XSee Model Spec Distance relay modelDISTRELAYXSee Model Spec Under excitation relaysUEL1 & UEL2 IEEE (2005) - Excitation system modelsSee IEEE efforts Composite load model with DGUnder development Colstrip ATRUnder development (NWE) Generator protectionUnder development (MSRATF) OtherSee Approved Dynamics List X

Load Modeling

Load Modeling – Experience with CMPLDW Phase 1 CMPLDW is being provided with 2014 WECC base cases CAISO, SCE, and WECC reported that high voltages ( pu) were seen during the simulations Overvoltages are most sensitive to protection trip set points and load composition Need data from actual events to validate how much load trips during actual events and compare against simulation

Load Modeling – Composite Load Model Data Tools Tools available on the TSS Base Cases website in the Composite Load Model Tools folderComposite Load Model Tools folder  Load Model Data Tool LMDT4A “2012 WECC CMPLDW.zip”  Updated Load Composition Data *NEW* “CMPLDW Load Composition Data_ zip”  PNNL Tool to create PSSE dyr format “LMDT_install.zip”

Load Modeling – CMPLDW Phase 2 Work (Bill Price) Reduced computation time by not performing network matrix rebuilding and factorization every time the taps are changed by LTC (v18.1_03) Added protective functions to MOTORC model (v18.1_03) Implemented request to force initial far-end voltage to be no less than 0.95 by changing taps instead of reducing feeder R&X (v18.1_03)  Instead of these solutions, a new request by LMTF is to add a new parameter Vmin to block the model if the voltage is less than Vmin Benchmarking will be performed between improved MOTORC and LD1PAC models to determine if MOTORC model option should be added to CMPLDW Results with transformer saturation modeled showed very minor voltage differences, there is no plan to add this complexity to the model Distributed PV will be incorporated into CMPLDW Presented a method to simply data management - CMPLDW2

Load Modeling – Voltage Dip Criteria WECC-0100 project is to develop a guideline for items remaining from RBP and other needs for TPL-001-4, including acceptable voltage response  TPL-001-WECC-RBP-2.1 retirement on 12/31/2015 Whitepaper discussed:  For small and frequent events, focus on preservation of load  For large events, multiple contingencies, or major capacity imbalances, need to contain it  Sensitivity studies with respect to modeling uncertainty are required for events that are initiated by large faults MVWG will perform studies and come up with recommended performance guidelines that align with the white paper to support WECC-0100 regarding the transient voltage performance criteria

System Model Validation

May Event Validation Report MVWG approved the “Model Validation and System Performance Analysis for PDCI RAS Event that Occurred on May 30, 2013” Report Posted on website: WECC MVWG > Documents > Approved Documents WECC MVWG > Documents > Approved Documents

System Model Validation WECC staff has developed a Sep 8, 2011 case for model validation, available to operating entities on request MVWG is continuing to improve the process to develop future model validation cases  Using WSM data, EMS data, PI data  Created a spreadsheet of key info to collect data from utilities Additional event cases are being developed:  April 29, 2013  July 2, 2013  July 4, 2013

System Model Validation MVWG is participating in the TSS WBRTF effort MVWG contract with GE to convert WECC dyd data to an “element code” definition with WSM  GE presented update of node-breaker capabilities in PSLF version 19 beta  Uses EMS labels for devices (e.g. bus LID) – provides capability to import WSM node-breaker model data into PSLF  Has provided benefits to reconciling modeling differences, identifying and fixing modeling discrepancies  Final deliverable should be completed in the next few months PTI presented PSSE node-breaker format features – under development

Generator Modeling, Testing, and Model Validation

Synchronous Generator, Excitation and Turbine Control Models Frequency Response Tool Recent Disturbance Events Power Plant Model Validation Tools Power Plant Model Data Task Force Excitation Model Update Governor Modeling

Frequency Response Tool BPA Generator Frequency Response Tool availableGenerator Frequency Response Tool  Uses PI data Eric Bakie (IPCO) presented an improved Generator Frequency Response Tool  Incorporates PPMV tool for model validation  Includes batch processing, for multiple units and multiple events  Training will be provided when tool is made available

Recent Disturbance Events Jan 29, 6:47:06 PT – Freq dropped to Hz Jan 29, 7:03:58 PT – Freq dropped to Hz Feb 2, 11:29:32 PT – Freq dropped to Hz Feb 21, 10:14:16 PT – Freq dropped to Hz Apr 9, 17:33 PT – Freq dropped to Hz Apr 15, 05:46:00 PT – Freq dropped to Hz Apr 15, 14:43:10 PT – Freq dropped to Hz Apr 17, 16:21:03 PT – Freq dropped to Hz Apr 21, 10:41:43 PT – Freq dropped to Hz Apr 29, 05:23:28 PT – Freq dropped to Hz

Power Plant Model Validation Tools Enhanced tool for verifying generator response “Dynamic Generator Testing.zip” is available on the WECC TSS Base Cases > Data Checking Tools websiteTSS Base Cases > Data Checking Tools Power Plant Model Validation (PPMV) version 1B using PSLF play-in function is available on the WECC MVWG PPMDTF Documents website PPMDTF Documents Frequency response tool “Gen_Freq_Response.zip” is available to help analyze generator response to frequency disturbances“Gen_Freq_Response.zip” John Undrill’s data checking tool is posted in the For Generators area in Generator Testing Program FolderGenerator Testing Program

Power Plant Model Data Task Force Reviewed the most recent list of suspected errors – if there are additional errors suspected, continue to send them to Kent Will include suspect data errors related to “xcomp” model – sister units should not have a positive xcomp unless there is a ccomp model Include check that Pmax in powerflow should be less than the governor capability mwcap or there will be an initialization error MVWG will work with SRWG to incorporate additional data checks into the base case review process

Excitation Models IEEE Standard on excitation models is hopefully up for ballot soon  Includes approximately 30 excitation models  All include HV and LV gates to incorporate OEL and UEL models More discussion will be needed to determine which model(s) WECC will recommend to be the approved Currently OEL1 is WECC approved UEL1 and UEL2 have been recommended to be implemented in the programs

Governor Modeling Starting an effort to review hydro turbines and hydro governors – lead TBD Hydro governor models and corresponding documentation are to be reviewed and changed as necessary in the programs to include the non-windup limits on the PI controller: h6b, pidgov, hyg3 and gpwscc (or wshygp in PSSE).

HVDC Modeling

Conventional point-to-point HVDC  Dynamic model: under development Investigating discrepancies between the EPRI and Siemens benchmark test case Additional tests will be performed to ensure consistent results Updates to report will be made as an ongoing effort VSC point-to-point HVDC  Powerflow model Implemented in PSSE, beta in PowerWorld, beta in PSLF Testing is underway  Dynamic model: two proposals are being discussed Memo by Siemens is currently under review by task force

HVDC Modeling Ongoing Issues  Trans Bay DC model still needs to be validated  PDCI Modeling Sylmar model still needs to be validated Celilo is expected to be replaced in 2016, the updated model is in progress

Other Items

NERC Updates WECC Project Updates MSRATF Update – RAS/Relay Modeling Program Updates – PSLF, PSSE, PowerWorld, and Powertech

NERC Updates Eric Allen (NERC) provided updates MOD (modeling data) and MOD (validation) are approved and filed for regulatory approval  Update: FERC approved on May 1, 2014 NERC MWG efforts:  Node-breaker modeling – implementation targeted for December 2015  Standardization of models – initial draft for powerflow and dynamic models are completed, not intended to override interregional lists  Developing a list of issues for sharing data between entities when events occur

WECC Project Updates WECC-0101 SAR Gen Validation Policy  Drafting team chaired by Shawn Patterson USBR  Draft variance has been posted for comment, due April 28 th WECC-0099 PSS Effectiveness  Drafting team formed (consists of Control Work Group), chaired by Martin Bauer USBR  First meeting held in March 2014  Additional studies by MVWG will be performed to support this effort

Next Meetings & Workshops

June in Salt Lake City, hosted by WECC  Renewable (Wind/Solar) Modeling Workshop -- June 17 th all day  MVWG Meeting -- June 18 th all day & June 19 th morning November in Albuquerque NM, hosted by Sandia National Laboratories  REMTF Meeting -- Nov 18 th afternoon & Nov 19 th morning  MVWG Meeting -- Nov 19 th afternoon & Nov 20 th all day LMTF, HVDCTF and PPMDTF will meet independently from the main M&VWG meeting.

Questions ?