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MVWG Report to TSS April 2012. Stephanie Lu Puget Sound Energy. Presentation Overview. WSM and BCS Reconciliation Task Force Typical Machine Data Document Generator Testing Policy & Guidelines Approved Dynamic Model List Load Modeling System Model Validation

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Mvwg report to tss april 2012

MVWG Report to TSSApril 2012

Stephanie Lu

Puget Sound Energy

Presentation overview
Presentation Overview

  • WSM and BCS Reconciliation Task Force

  • Typical Machine Data Document

  • Generator Testing Policy & Guidelines

  • Approved Dynamic Model List

  • Load Modeling

  • System Model Validation

  • Generator Modeling, Testing, and Validation

  • Renewable Generation Modeling

  • HVDC Modeling

  • Transient Stability Program Benchmarking

  • Next Meeting

New task force wsm and bcs reconciliation
New Task Force – WSM and BCS Reconciliation

  • See Slaven Kincic’s presentation

  • See WBRTF charter WBRTF Draft Charter.docx

  • Motion: Approve the charter for the new WSM and BCS Reconciliation Task Force (WBRTF).

Typical machine data
Typical Machine Data

  • See Typical Machine Data document Typical Machine Data.pdf

  • See proposed changes to document Typical Machine Data_AE comments 4-10-12.doc

  • Motion: Approve the Typical Machine Data document with proposed changes.

Generator testing policy
Generator Testing Policy

  • See Generating Unit Model Validation Policy document with proposed changes WECCGeneratingUnitModelValidationPolicy v.3-22-12.docx

  • Motion: Approve the WECC Generating Unit Model Validation Policy with the proposed changes.

Generator testing guidelines
Generator Testing Guidelines

  • Proposed consolidation into a single document:

    • Generating Facility Model Validation Requirements

      • With minor changes

    • Generating Unit Baseline Test Requirements

      • Add sub-section 1.d for V-curve data as discussed

      • Add wind and solar generator testing requirements

    • Generating Facility Data Requirements

      • Add non-synchronous generator data requirements

    • Over Excitation Limiter (OEL)/Over Excitation Protection (OEP) Testing Requirements

      • To be reviewed and updated

    • Generator Test Exemption Procedure (no changes)

  • The proposed changes will be up for discussion and approval at the next M&VWG meeting.

Approved dynamic models list
Approved Dynamic Models List

  • March 2012 Update – Moved motor1 model to approved list under load models. This is not to be used anymore for wind models.

  • Latest version: WECCApprovedDynamicModelLibraryMarch2012.pdf

Load modeling overview
Load Modeling Overview

  • Status of Phase 1 Implementation Plan

  • Review and Updates to Composite Load Model Data and Tools

  • Validation and System Impact Studies

  • Next Steps

Status of composite load model implementation plan phase 1 cont2
Status of Composite Load Model Implementation Plan Phase 1 (cont.)

  • For the 12HS4 case, about 300 loads had invalid or missing LIDs and therefore did not have a dynamic model record created for it

  • Corrections for missing, invalid, and incorrect LIDs have been requested of SRWG and an updated dyd will be posted when available

Composite load model data and tools
Composite Load Model Data and Tools (cont.)














Loa d mo del composition long id lid
Loa (cont.)d Model Composition – Long ID (LID)

  • LID Instructions has been updated to include a map of the climate zones

  • Posted on the WECC website in the MVWG LMTF Document folder as “LID_Instructions_2012-4-10.pdf”

Loa d mo del data tool lmdt3a
Loa (cont.)d Model Data Tool LMDT3A

  • Tool updated with a new epcl to check the validity of the LIDs, and reports the loads with invalid or missing LIDs

  • User instructions manual also updated

  • To be posted on the WECC website in the TSS Base Case section in the Year 2012 GE PSLF folder

Load composition model tools
Load Composition Model Tools (cont.)

  • PNNL is developing the “next generation” LCM tool

    • Combines the ease of interface of the WECC light model and ability to create a dyd file with the computational capabilities of the full PNNL model, including the capabilities of validating the load shapes

Load model system impact studies
Load Model System Impact Studies (cont.)

  • BPA, PSE, and CalISO presented additional study results

  • From BPA’s study, the tripping of 3-phase motor loads may be more optimistic in oscillation studies

Next steps
Next Steps (cont.)

Next steps1
Next Steps (cont.)

  • Phase 1: See implementation plan

  • Phase 2:

    • Perform additional sensitivity studies

    • Continue work on determining protection settings

    • Continue work on understanding the phenomenon of air-conditioner stalling in distribution systems (supported by DOE and LBNL)

    • Continue collecting disturbance recordings for validation, e.g., SCE’s PQube recordings

    • Provide recommendations for changing the voltage dip criteria

  • Continuous: Model validation

System model validation studies
System Model Validation Studies (cont.)

System model validation is a priority of MVWG and a deliverable under the Western Interconnection Synchro-phasor Program

System model validation is part of the NERC Model Validation Working Group efforts

Major impediment:

Validation base case development


Automate the process of base case development

Leverage West-wide System Model (WSM)

System model validation studies1
System Model Validation Studies (cont.)

WECC Powerflow Case:


Bus number, ID

WSM Powerflow Case:


Element Code


WECC Dynamic Database:

Bus number, ID

WSM Dynamic Database:

Element code, node


System model validation studies2
System Model Validation Studies (cont.)

  • Option 1 (WECC is working on the contract):

    • Convert WECC dynamic data base to “element code” definition consistent with WSM (one time effort)

    • Validation studies are done using WSM powerflow case and the new dynamic data file

  • Option 2 (developed by MVWG resources):

    • Map generation, loads and equipment status from WSM to WECC powerflow case

    • Validation studies are done using WECC powerflow case and existing dynamic database

Wsm and bcs reconciliation task force wbrtf
WSM and BCS Reconciliation Task Force (WBRTF) (cont.)

The task force will improve the ability to leverage the WSM for system model validation studies

Some members from M&VWG and SRWG have volunteered to participate in this newly proposed task force

Synchronous generator excitation and turbine control models
Synchronous Generator, Excitation and Turbine Control Models (cont.)

Power Plant Model Data Task Force

OEL, UEL and generator protection models

Turbine-governor models

Power Plant Model Validation

Power plant model data task force
Power Plant Model Data Task Force (cont.)

  • Review existing data

    • Data errors are to be sent to Kent Bolton for compilation, as a first step to addressing the errors

  • Improve data checking and processing of new data

    • WECC will begin using the data checker developed by John Undrill

    • John Undrill will enhance the data checker and provide it to WECC members for their use

Power plant model data task force cont
Power Plant Model Data Task Force (cont.) (cont.)

  • Develop processes and tools to improve coordination between GOs and TPs for submitting data

    • The concept of an ‘alert’ was discussed as a way to share the compiled data errors and work with the GOs and TPs

  • Review the existing WECC power plant model validation guidelines and recommend improvements

    • Currently under review

Excitation models oel
Excitation Models - OEL (cont.)

  • OEL1 was determined to have the required functionality

    • Has fixed, and instantaneous limits, fixed time or inverse, ramped or immediate

    • Has no dynamics – bypasses exciter to a fixed Efd set point – usually adequate for long term reactive supply studies

    • Is a takeover limiter without need for tuning

    • Pickup timing does not reset

Excitation models oel cont
Excitation Models – OEL (cont.) (cont.)

  • Short term recommendation:

    • Use OEL1 model and implement in all programs

    • Make changes to existing exciter models, as needed, to make it compatible with OEL1 (not compatible with all es type models)

    • Some further validation work comparing OEL1 to actual OELs

    • Provide default OEL1 model for each generator that does not already have one (alarm only)

  • Longer term recommendation:

    • Incorporate limiters into the excitation models

Excitation models uel
Excitation Models - UEL (cont.)

  • UEL1 and UEL2 already exist

  • Recommendation: Implement UEL1 and UEL2 in all programs

Turbine governor model
Turbine-Governor Model (cont.)

  • “Baseloaded” flag of 1 blocks the governor from responding upward

    • Addresses actual generator response during underfrequency situtations

  • Through disturbance recordings, baseloaded units also do not respond downward

  • Short-term recommendation: Implement a baseload flag of 2 to block governor response in both directions

  • Mid-term recommendation: Review power plant operational information and revise implementation to appropriately model “baseloaded” practices

Power plant model validation
Power Plant Model Validation (cont.)

Power Plant Model Validation (PPMV) version 1B using PSLF play-in function is available on the WECC website in the MVWG PPMDTF Documents site

Status of wind modeling effort
Status of Wind Modeling Effort (cont.)



Version 1 of wind generic models implemented as library models in PSSE, PSLF and other platforms

Phase 2 of wind model development model structure improvements
Phase 2 of wind model development – Model structure improvements

  • Type 1 and 2:

    • Pitch model redesigned

    • Good validation against MWT1000A

    • Partial validation against V82-AGO5 is driving the need to better emulate acceleration control

  • Type 4:

    • Model specifications approved by REMTF with minor modifications (e.g. additional features to P/Q control and plant control)

    • Excluding plant level controls, validation work shows good results for multiple manufacturers (Siemens, Vestas, and ABB, and simulated cases from ENERCON)

Phase 2 of wind model development model structure improvements1
Phase 2 of wind model development – Model structure improvements

  • Type 3:

    • Identical to Type 4 except for the addition of pitch and torque control and simplified aero-dynamic model

    • Initial validation with Vestas and ABB look good, data also received from RePower

    • Specifications are planned to be completed by June

  • All 4 wind models are expected to be up for approval at the November MVWG meeting.

Large pv power plant modeling
Large PV Power Plant Modeling improvements

  • Specifications for the PV1X (PV1E and PV1G) models are nearly complete

  • It is a full featured model based on the WECC Type 4 wind generation model

  • Consistent with the WECC PV Modeling Guide, the feeder or collector system equivalent should be included in the power flow model for large PV plants

Distributed pv modeling
Distributed PV Modeling improvements

  • Specifications for the PVD1 stand alone model are nearly complete

  • PVD1 is a more basic model than PV1X and is intended to represent the aggregate effect of distribution-connected PV at the transmission level

  • REMTF proposed a simplified version of PVD1 to be added to the CMPLDW to create a CMPLDWg model. This still needs to be coordinated with LMTF, SRWG, NERC MVWG and the program vendors.

Hvdc modeling
HVDC Modeling improvements

Hvdc modeling1
HVDC Modeling improvements

  • The task force has started with the point-to-point Conventional and Voltage Source Converter (VSC) HVDC models

  • Conventional point-to-point HVDC

    • Powerflow model already exists, documentation is being improved

    • Tap control logic can be used for multiple controls in PSLF, and the logic will be shared with the other program vendors

    • Dynamic model design for rectifier and inverter has been identified

  • VSC point-to-point HVDC

    • Powerflow model specifications have been agreed upon

    • Ideas for the dynamic model are being discussed

  • A working draft of the document is in progress

Hvdc modeling issues
HVDC Modeling Issues improvements

  • Trans Bay DC Modeling

    • PG&E is in contact with TBC Operations to get test data to be used for model validation

  • PDCI Modeling

    • LADWP needs to provide an as-built model and run validation of the model and current control at Sylmar

Transient stability program benchmarking1
Transient Stability Program Benchmarking improvements

  • PSE shared results from benchmarking studies comparing PSLF, PSS®E, and PowerWorld

  • PSE will work with the program vendors on identifying reasons for the differences

Next meeting
Next Meeting improvements

March meeting layout
March Meeting Layout improvements

From March experience:

Need to eliminate task force schedule overlap

Overlap with SRWG not preferable





M&VWG Utility Mtg

SRWG Breakout 1

SRWG Breakout 1




SRWG Breakout 2

SRWG Breakout 2

SRWG Breakout 3

SRWG Breakout 3

HVDCTF met prior to the M&VWG meeting.

Maxwell Room

Edison/Fermi Rooms

Tesla Room

Next meetings proposed for june
Next Meetings – Proposed for June improvements


Eliminates overlap of task force meetings

Minimizes overlap with SRWG





SRWG Breakout 1

SRWG Breakout 1



SRWG Breakout 2

SRWG Breakout 2

SRWG Breakout 3

SRWG Breakout 3

HVDCTF, PPMDTF, and LMTF will meet independently from the main M&VWG meeting, as needed.

Maxwell Room

Edison/Fermi Rooms

Tesla Room

Upcoming workshops training
Upcoming Workshops/Training? improvements

  • Joint Training Session with SRWG and Program Users Work Groups?