MVWG Report to TSSMay 2015

Jun Wen, MVWG ChairSouthern California Edison

Recent MeetingsMeeting 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 DocumentsFor 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

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

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 Expect for approval at the June MVWG meeting 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

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

Significant Events (Feb - now)Date Local Time (PDT) GMT Time/Date Frequency Time to Recover

02/17/15 9:14 17:14 59.921 602/22/15 8:44 16:44 59.902 102/25/15 3:33 11:33 59.918 703/03/15 14:24 11:24 59.885 603/28/15 14:15 21:15 59.897 503/29/15 13:49 20:49 59.904 804/05/15 12:58 19:58 59.913 404/06/15 8:12 15:12 2-ph fault at PG&E04/07/15 6:17 13:17 59.93 204/14/15 9:14 16:14 CJ brake insertaion test #104/14/15 9:24 16:24 CJ brake insertaion test #204/14/15 15:14 22:14 CJ brake insertaion test #304/14/15 15:24 22:24 CJ brake insertaion test #404/28/15 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

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

Other Items Program 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

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

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 ?

May 26 2014 DC RAS Event17:31 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 Event03:24 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 Outage06:06 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