Jun Wen, MVWG Chair Southern California Edison MVWG Report to TSS May 2015 Jun Wen, MVWG Chair Southern California Edison

Recent Meetings Meeting Date REMTF Meeting Mar 17-18, 2015 LMTF Meeting Mar 18, 2015 MVWG Meeting Mar 18-19, 2015

MVWG Activities Overview Load Modeling Renewable Energy Modeling Generator Modeling, Testing, and Validation System Model Validation RAS Modeling HVDC Modeling Other Items Next Meetings and Workshops

MVWG Approved Documents For TSS Approval: The WECC Dynamic Composite Load Model (CMPLDW) Specifications Document The WECC Specifications for Modeling Distributed Generation in Power Flow and Dynamics The Simple Model Specifications REEC_C for Battery Energy Storage System Battery Energy Storage Model REEC_C to add to the WECC Approved Dynamic Model List PPMVDTF Charter

Load Modeling 5

Load Modeling – Composite Load Model CMPLDW Specification The WECC Dynamic Composite Load Model (CMPLDW) Specifications Document was developed and unanimously approved by MVWG. Motion: Approve the Composite Load Model (CMPLDW) Specifications Document

Load Modeling – Integrating DGs in Composite Load Model The WECC Specifications for Modeling Distributed Generation in Power Flow and Dynamics was developed and unanimously approved by MVWG. Motion: Approve the Specifications for Modeling DG in Power Flow and Dynamics. CMPLDW will be retired upon implementation and approval of CMPLDWG. Benchmark testing among the three vendors will be performed and presented at Nov 2015 MVWG meeting.

Load Modeling – Study Experience Phase 1 CMPLDW Study Experience Lower voltage dips and higher post recovery voltages are observed, as expected. Phase 2 CMPLDW Study Experience SCE’s studies show the voltage dips can go below 30%, the voltage recovery to pre-fault voltage typically takes ~20 seconds, and the post-recovery voltage can be up to 120%. DOE-MEPPI WECC Load Model Sensitivity Study Four participating utilities: Pacific Corp, PG&E, SCE, SRP Propose key sensitivity parameters and metrics in June LMTF Production studies post-June PSLF Load Modeling Enhancement LDTRPMON – new model to monitor MW tripped per area/zone

Load Modeling – Voltage Dip Criteria Idaho Power, SCE, and SRP will perform model validation studies and present at June LMTF meeting Discussed with WECC-0100 TVR AHWG and agreed to have phased approach on voltage dip/recovery criteria in corresponding to the composite load model implementation schedule MVWG will support WECC-0100 and provide composite load model phase 1 and 2 study results.

Load Modeling – Future Development Modular Structure for better data management Flexibility to add DG models BPA sensitivity study of AC stalling with respect to a point on wave – existing model is very conservative, Vstall, Tstall may be represented by a curve BPA “detailed” feeder model – feeder equivalent structure may be revised based on PSCAD studies and the need to integrate various types of DGs Protection and control models Parameter assumption

Renewable Energy Modeling 11

Energy Storage Modeling The Simple Model Specification REEC_C for Battery Energy Storage System was developed and unanimously approved by MVWG. The new model REEC_C was unanimously approved to be added to the WECC approved dynamic model list by MVWG. Motion: Approve the Battery Energy Storage Model REEC_C Specifications Document Motion: Add REEC_C to the WECC approved dynamic model list.

2nd Generation Wind & PV Models Missing models and inappropriate represented models (using genrou, gentpf, motor1 instead of renewable models) are of a higher concern than the transition. The transition plan to the 2nd generation renewable models may not be completed as planned. REMTF will help to develop the conversion routines to help the transition – the function/performance won’t be changed, GO and TP still hold the data responsibility.

REMTF – Next Steps White paper on limitations of generic models and use in positive sequence programs – In progress Expect for approval at the June MVWG meeting PV Plant Model Validation Guide Wind Plant Model Validation Guide will be next Renewable Model Validation Workshop in June Phase 2 renewable models are not well understood outside REMTF, webinars will be conducted to educate model users on model structure and data.

REMTF – Next Steps (cont’) Enhanced Plant Level Control (REPC_B) Additional new features: interface with multiple WTGs, interface with reactive support devices, and plant level power factor control option Model specification and model are expected for approval at the June MVWG meeting Enhanced Inverter-based DG (PVD2) Additional new features: additional active power controls, addition of time dimension to trip functions, auxiliary input for other functionality. Model specification and model are expected for approval at the Nov MVWG meeting

Generator Modeling, Testing, and Model Validation 16

Dynamics Error List Additional data checks in progress Over 6600 suspected data errors with John Undrill’s data checker tool PPMVDTF will prioritize and take the identified errors to build into the dynamics error list The renewable model checking was also planned to be added.

Cross Current Compensation Model Enhanced Cross Current Compensation Model (CCOMP4) Use the reactive current instead of total current for feedback and allow up to four units Model specification and model are expected for approval at the June MVWG meeting

Excitation Models IEEE Standard 421.5 on excitation models is close to going out for ballot More discussion will be needed to determine which model(s) WECC will recommend to be the approved Currently OEL1 is WECC approved

Power Plant Model Validation and Data Task Force (PPMVDTF) The scope of existing Power Plant Model Data Task Force was expanded to include the model validation task. The charter of the Power Plant Model Validation and Data Task Force was unanimously approved by MVWG. Motion: Approve the charter of the Power Plant Model Validation and Data Task Force.

PPMVDTF Roadmap and Progress PPMVDTF drafted roadmap for implementing renewable models with a phased approach The work plan for renewable models is expected for approval at the June MVWG meeting PPMVDTF developed an epcl for extracting wind and solar power plant model data from WECC base case For 2015 light summer operating case: WECC case has close to 29 GW of total wind and solar generation 100 MW of generation connected at 69, 115, and 138-kV levels 74 plants with 5 GW of generating capacity are connected at 24 to 35-V level, and therefore have no collector system representation, as required by WECC Data Preparation Manual, mainly Alberta and Colorado 94 plants with 5.2 GW of generating capacity have no dynamic models, mainly in Southern California and Alberta 54 plants with 2.8 GW of generating capacity are modeled with inappropriate dynamic models – “motor1”, “gentpf”, “genrou”, mainly in BC and Alberta Significant opportunity for model improvement

System Model Validation 22

Significant Events (Feb - now) Date Local Time (PDT) GMT Time/Date Frequency Time to Recover 02/17/15 9:14 17:14 59.921 6 02/22/15 8:44 16:44 59.902 1 02/25/15 3:33 11:33 59.918 7 03/03/15 14:24 11:24 59.885 03/28/15 14:15 21:15 59.897 5 03/29/15 13:49 20:49 59.904 8 04/05/15 12:58 19:58 59.913 4 04/06/15 8:12 15:12 2-ph fault at PG&E 04/07/15 6:17 13:17 59.93 2 04/14/15 16:14 CJ brake insertaion test #1 9:24 16:24 CJ brake insertaion test #2 15:14 22:14 CJ brake insertaion test #3 15:24 22:24 CJ brake insertaion test #4 04/28/15 6:06 13:06 59.798 18

System Model Validation Event Model Validation Efforts: May 26 2014 DC RAS Event In progress, plan for approval at the June MVWG meeting October 18 2014 Colstrip Event Node-breaker validation study completed, results show optimistic frequency response than in reality Further investigation in progress with focus on: governor sensitivity study, performance of hydro units, and impact of station service loads. Apr 28 2015 PDCI Outage MOD-033 Draft guide on how WECC performs system wide model validation – in progress

RAS Modeling 25

RAS Modeling James O’Brien updated the RAS modeling status and called for volunteers to develop the RAS modeling in transient stability Eric Bahr (NWE) provided an overview of the Colstrip ATR scheme and the model specifications. ATR model specifications and model are expected for approval at the June MVWG meeting

HVDC Modeling

HVDC Modeling Conventional HVDC point-to-point model Powerflow model – exists Dynamic model – target to have model specification and model for approval in the Nov MVWG meeting VSC HVDC point-to-point model Powerflow model – completed in all three software tools Dynamic model – the interface between power flow model and dynamic model still needs to be decided

HVDC Modeling Current status of WECC base case models for PDCI, IPP DC and TBC was discussed General Rule: black box modeling is not accepted, generic model should be used as where fit. PDCI model specification and model are expected for approval early 2016 TBC model, depending upon the timing, may be represented with generic VSC model that is under development.

Other Items 30

Other Items Program Updates NERC Updates WECC Updates SRWG Updates PSLF, PSS@E, PowerWorld, PowerTech NERC Updates WECC Updates SRWG Updates WECC Website and MVWG Documentation MVWG TFs New LMTF and PPMVDTF Chairs

NERC Updates Eric Allen (NERC) provided updates: NERC MWG drafted report to address the third step of node- breaker implementation plan (development of power system analysis software with the capability of using “node-breaker” representation). FERC issued a NOPR proposing to approve PRC-002-2 and to retire PRC-018-1 A new TF was approved under NERC MWG for turbine control modeling The revision of MWG Model Validation Procedure is planned to be posted around end of 2015

WECC Project Updates WECC-0101 SAR Gen Validation Policy Drafting team chaired by Shawn Patterson USBR Comments and feedback have been light. Shawn encouraged more MVWG member involvement. WECC-0107 PSS Design and Performance Drafting team chaired by Martin Bauer USBR (consists of Control Work Group) Elements currently under discussions are documenting when PSS should be operational and grandfathering existing units.

MVWG Documentation MVWG Page MVWG Share Drive Upload Approved Documents Adding Meeting Documents MVWG Meeting Summary / TSS Report MVWG Action Item Log MVWG Model, Document, Tool, Webinar Reference Document MVWG Share Drive

MVWG TFs LMTF – Hamody Hindi (BPA)* PPMVDTF – Steve Yang (BPA)* REMTF – Abe Ellis (Sandia) HVDCTF – Pouyan Pourbeik (EPRI) * New TF Chairs in June 2015

Next Meetings & Workshops 36

Next Meetings & Workshops Jun 16-18 in Salt Lake City REMTF Meeting – Jun 16th afternoon and 17th morning LMTF Meeting -- Jun 17th morning MVWG Meeting -- Jun 17th afternoon & Jun 18th all day HVDCTF and PPMVDTF will meet independently from the main M&VWG meeting Workshops and Webinars Renewable model validation – In conjunction with REMTF meeting, details TBD How to use PSLF v19 and WSM in node-breaker format – Jun 24th 10-noon Mountain Time

What to Expect in next TSS Meeting Composite Load Model work plan PPMVDTF work plan MVWG Charter MVWG work priorities REPC_B model and model spec ATR model and model spec CCOMP4 model and model spec Whitepaper on limitations of generic model PV model validation guideline May 26 2014 DC RAS model validation report

Questions ? 39

October 18 2014 Colstrip Event May 26 2014 DC RAS Event 17:31 PDT System frequency to 59.665 Hz momentarily and normal in 14 minutes when Celilo Converter 1 blocked and BPA-11 Remedial Action Scheme operated tripping 2500 MW of Pacific Northwest generation. WECC Transfer Path 65 (PDCI) limited with converter out. October 18 2014 Colstrip Event 03:24 PDT System frequency fell from 60.0216 Hz to 59.9035 Hz and recovered within five minutes when Colstrip Units #3 tripped offline, rejecting approximately 729 MW of generation Apr 28 2015 PDCI Outage 06:06 PDT WECC Transfer Path 65 (PDCI) unavailable when Celilo-Sylmar 1000 kV DC Line Poles 3 and 4 blocked and failed to restart after vehicle struck tower 133-2 and conductor parted.  System frequency to 59.798 Hz momentarily and normal in 18 minutes when BPA-11 Remedial Action Scheme operated tripping 1824 MW of Pacific Northwest generation.

2nd Generation Wind Models

Photovoltaic Models For large-scale PV plants: For distributed and small PV plants, use PVD1 model