MVWG Report to MS. Song Wang, MVWG Chair November 30, 2017

Transcription

1 MVWG Report to MS Song Wang, MVWG Chair November 30, 2017

2 Recent Meetings Meeting / Workshop Date LMTF Meeting October 3, 2017 REMTF Meeting October 4, 2017 PPMVDTF Meeting October 4, 2017 MVWG Meeting October 4 5, 2017

3 MVWG Activities Overview and Approval Items Load Modeling Renewable Energy Modeling System Model Validation Generator Modeling, Testing, and Model Validation HVDC Modeling RAS and Relay Modeling WECC Approved Dynamic Model List

4 Load Modeling

5 Present Load Model Development Status WECC TSS approved CMPLDW phase 2 at May 2017 meeting and it will be implemented in the WECC 2018 base case compilation schedule. WECC LMTF will continue to explore improvements to threephase and single phase motor models. WECC LMTF will focus on Load Composition WECC LMTF will continue to working on the CMPLDW2 model development. MVWG will work on CMPLDW + DER_A model approval

6 Next Steps in Load Model Experience with CMPLD model provides a useful feedback on future improvements needed to make models behave better in gird simulations Increasing percentage of electronically connected loads(vfds, ECMs, chargers) Distributed energy resources (PV solar, batteries) and changing characteristics from IEEE 1547 legacy to smart features Current composite load model CMPLD is rigid with respect to model components and their models Need for flexible load model structure

7 2 nd Generation CMPLD Modular model structure Need for model flexibility with respect to model components Consistent rules for model data interpretation Efficient data management no need to repeat the same data many times End Use component models Distributed energy resources Single phase motor models Performance model: Revise stall and reaccelerate characteristics MOTORC model: validate MOTORC model, include in load component library

8 2 nd Generation CMPLD End Use Component Models Power Electronic Load: We may need to differentiate between ECMs, motor drives and electronic/computing/charging loads Protection and Control Modules: Revise protection and control models to allow for progressive motor tripping Model Benchmarking Studies Develop a set up for model benchmarking, certify version releases

9 2 nd Generation CMPLD Data Load Composition Planners need to develop understanding of load composition in typical commercial and residential buildings Understand changes in load composition Building surveys Development and validation of next generation Load Composition Model Development of default data sets Data Management Tools Load Model Data Tool for data management need to be aligned with the new model structure More transparent load composition data

10 Load Composition DOE project: to improve the load composition model Load protection aggregation is one of the big challenge Surveys from the BPA Headquarter building 80% of total load in the building are electronically connected (VFD drive) Portable Power System Monitor technology applied for building monitoring

11 CMPLDWG model There is request to have distributed energy resources modeled in the WECC base case Based on current CMPLDWG (CMPLDW + PVD1) model, MVWG decided to develop DER_A model to represent distributed energy resources, and also replace PVD1 model in COMPLDWG model DER_A model has been tested and some observed inconsistencies in the response to voltage and frequency disturbance play in values displayed across the four software platform The new beta version will be created and re tested

12 CMPLDW Studies and Criteria

13 CMPLDW Studies and Criteria Stalling of single-phase A/C disabled Stalling of single-phase A/C enabled

14 Renewable Energy Modeling

15 DER_A Model development PVD1 PVD2 DER_A Siemens PTI Completed beta ready to test GE completed beta ready to test PowerWorld completed beta model Beta version tested New beta model ready for further test

16 Low Short Circuit Ratio System Generator/Convertor Model (REGC_B) Current source model (REGC_A)

17 Low Short Circuit Ratio System Generator/Convertor Model (REGC_B) Four more parameters (Re, Xe, Ted, Teq)

18 Weak Grid Option Modeling REEC_D Wind power penetration increased More weak grid interconnected projects Weak grid projects experienced voltage oscillations and turbine tripped Weak Grid Option was applied in projects to help stabilizing turbine REMTF agreed to write a specification for additional module, called REEC_D

19 Simulate Inverter Momentary Cessation Momentary cessation modeling requirement Active and reactive currents Time delay Ramp rate limit of active current during recovery Reactive current control during recovery Priority between active and reactive current during recovery Generic models with MC modeling capability Reec_a model Use reec_a for all wind/solar generators Use In run epcl to simulate Momentary Cessation Dynamic model errors Add to dynamic data checking list

20 Synthetic Inertial Response for wind General Remarks WTGs can provide it without maintaining any reserve Typically, 5 10% of rated power There is a minimum wind power output below which this response cannot be provided (typically 20 25% of rated) After initial burst of electrical energy, eventually energy has to be given back to reaccelerate the At or above rated wind speed there is little to no energy that has to be given back to reaccelerate turbine can get the additional energy out of above rated wind energy Some Implementation Issues The piece wise linear approximation may not exactly match all vendor implementations Will need 2D (or3d) look up table Power versus Turbine Speed versus Wind Speed May need extra input to model (wind speed) Will need turbine speed for type 4 WTG

21 Standard DLL Interface Concept originally presented by Samer EI Itani (Senvion) Discussed now for a few MVWG meetings Siemens Wind & ABB have also shown interest in this concept Need more support for the concept

22 System Model Validation W E S T E R N E L E C T R I C I T Y C O O R D I N A T I N G C O U N C I L

23 System Model Validation Studies & NERC MOD 033 Find cases on peakrc.org Updates on WECC Wide Events Model Library.aspx

24 Generator Modeling, Testing, and Model Validation

25 Wind and Solar Modeling Roadmap NERC MOD 032, 025, 026, 027 standards require Generator Owner to provide data for Transmission Planner to develop steady state, dynamic and short circuit models. Couple of guidelines developed by WECC REMTF WECC Wind Power Plant Power Flow Modeling Guide %20Flow%20Modeling%20Guide.pdf WECC Wind Power Plant Dynamic Modeling Guide c%20modeling%20guidelines.pdf

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27 Experience with Field Testing of Types 3 WTGs Volt/Var Testing: Switch the large transmission MSC (turn off SC) Switch MSC in collector system (one case where possible) Voltage reference Frequency Response Testing: Plant has none prove with disturbance recordings

28 Key Observations/Conclusions WPPs in close proximity need: Close coordination for tests Get reactive drop and control loop parameters Verify proper coordination of reactive drop Need to monitor all simultaneously for certain tests Multiple tests (if possible) are useful for great confidence in the models The 2nd generation generic models worked well for all tests

29 Cross Current Compensation Model CCOMP model still in WECC base case CCOMP4 model approved by MVWG in 2015 Translate easily from equipment settings into the model format Allows for up to four units Act on reactive current as does the equipment

30 Cross Current Compensation Model CCOMP model with flag = 1 (individual unit series compensation set by Xcomp, Rcomp in generator models) can be converted to CCOMP4 K1 =Xc + Xcomp, K2 = Xc, Kc = 1 CCOMP models with flag = 0 (original implementation of ccomp) can be converted CCOMP4 K1 = Xc + Xt, K2 = Xt Xc, Kc = 1

31 Proposed GENTPW model

32 Next Step for New Generator Model Development Gather/Compile datasets Develop GENTPW model Finalize model structure, including gathering comments/feedback from industry experts Write specification Pseudo code development Beta version in commercial software platform Benchmarking GENSAL, GENROU, GENTPJ and GENTPW model with test data

33 Turbine Governor h6e Model Update The initialization part of the h6e model has been changed to an explicit from that gives better assurance of a clean start The latest code was sent to software vendors

34 Dynamic Data Error List Model Name Parameter Error Notes regc_a/pv1g/wt4g accel accel = 0 0 < accel < 1 regc_a/pv1g/wt4g mva mva < pgen mva base > PGEN reec trv Trv = 0 Trv > 0 reec kvi warning: kvi >= 100 is likely to exhibit voltage oscillation Kvi is the most critical parameter for reactive current control. High kvi causes overshooting of voltage control. It should be tuned and validated. repc_a outflag outflag = 0 for voltage control If Mon_i and mon_j are absent from the invocation and refflg = 1, then outflag should be 1 repc_a Kc warning: Kc > 0, but mon_i and mon_j are not provided in the invocation voltage droop control is not activated if mon_i and mon_j are not provided reec and repc pfflag, vflag, qflag, refflag The set of these four flags do not match any of the reactive power control options lhfrt dftrp, dttrp not PRC 024 compliant dftrp is frequency change in Hz, not %

35 HVDC Modeling

36 LCC HVDC Modeling The simple LCC HVDC model specification was issued in 2015 HVDC TF webcast meeting on 7/26/2017 Discussed test plan for chvdc2 beta releases in commercial tools Commercial tool vendors made every effort to complete beta implementation August 23, 2017 issued test plan and test system plus test simulation results to TF Results memo released 9/28/2017

37 LCC HVDC model test case LCC HVDC Modeling

38 LCC HVDC Modeling LCC HVDC model test results The LCC HVDC dynamic model was unanimously approved by MVWG

39 VSC HVDC Modeling Have implemented it as epcl code Code done and debugged Will come back to HVDC TF once more substantial results for consultation amongst group Then come back to MVWG to start process of commercial software tool beta implementation and testing

40 High Level Documentation of PDCI and IPP High level documentation on control strategy for PDCI and IPP are done. ABB internal review is in progress, to be followed by owner/operator review before releasing to WECC MVWG

41 RAS and Relay Modeling

42 Global line relay monitoring model The global line relay monitoring model specification approved at June MVWG meeting It has been implemented to commercial software platforms The global line relay monitoring model gives Transmission Planners a capability to comply with NERC TPL standard requirement There is still issue for the line relay applied to multi section, series compensated lines MVWG may form a Relay Task Force to solve all the relay protection issues

43 RAS model Status of DOE RAS/SPS modeling project Survey of RAS/SPS modeling practice for planning and operational studies Identification of RAS examples and operation logics in a commercial software platform for use case development Development of adaptive algorithms for calculating RAS settings with HPC techniques Prototype development in commercial software Demonstration of the prototype Outreach activities

44 WECC Approved Dynamic Model List

45 WECC Approved Dynamic Model List The latest approved dynamic model list is available at WECC website Models%20October% pdf

46 Next MVWG Meetings

47 Next MVWG Meetings 1 st MVWG Meeting January 24 pm January 26 am, 2018 Salt Lake City, UT 2 nd MVWG Meeting May 23 pm May 25 am, 2018 Salt Lake City, UT 3 rd MVWG Meeting October 22 pm October 24 am, 2018 Salt Lake City, UT

48 Questions?