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MVWG Report to TSS Aug 2016

This report provides an overview of the activities and approval items discussed in the MVWG workshop held in August 2016, including load modeling, renewable energy modeling, system model validation, generator modeling, HVDC modeling, RAS and relay modeling, and more.

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MVWG Report to TSS Aug 2016

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  1. MVWG Report to TSSAug 2016 Jun Wen, MVWG Chair Southern California Edison

  2. Recent Meetings

  3. Aug MVWG Workshop • Aug 30-31, Portland, hosted by BPA • The second regional workshop this year (1st regional workshop was held in March at San Diego) • Aug 30 and Aug 31 am: Load modeling • Aug 31 pm (closed session): System model validation • Registration link: https://www.eventbrite.com/e/modeling-and-validation-work-group-mvwg-workshop-registration-26247356550 • NERC SMS is hosting Power Plant Model Validation Workshop Sep 20-21, Atlanta.

  4. MVWG Activities Overview and Approval Items • Load Modeling • MVWG approved item: Proposal to change WECC default protection data set to match the NERC default data set pending system impact study results – Information only • Renewable Energy Modeling • REMTF Charter – Information Only • Model spec of enhanced plant controller model (REPC_B) – Approval Item • Addition of REPC_B model to WECC approved dynamic model list – Approval Item • System Model Validation

  5. MVWG Activities Overview and Approval Items • Generator Modeling, Testing, and Model Validation • Model spec of hydro turbine governor model h6e – Approval Item • Retirement of h6b model from WECC approved dynamic list – Approval Item • Addition of h6e model to WECC approved dynamic model list pending software implementation – Approval Item • GENTPJ white paper – Approval Item • HVDC Modeling • RAS and Relay Modeling • RAS Modeling and Validation TF Charter – Information Only • WECC Approved Dynamic Model List • NERC and WECC update

  6. Load Modeling

  7. Composite Load Model Data Comparison of Existing Data and Proposed Data Vtr1a: First low voltage trip level Ttr1a: First low voltage trip delay time Ftr2a: Second low voltage trip fraction Vrc2a: Second low voltage reconnection level Motor A represents three-phase induction motors with low inertia (H=0.1 sec) driving constant torque loads. • Smaller 5-15 HP three-phase commercial compressors such as rooftop air-conditioners • Larger 200-500 HP three-phase compressors such as chillers or central cooling systems in large commercial buildings “Default dataset” by NERC LMTF

  8. * Note that 20% larger motors do not reconnect and the 75% smaller motors do reconnect. The motion to change the WECC default protection data set to match the NERC default data set (Vtr1a=0.65, Ttr1a=0.1, Ftr2a=0.75, Vrc2a=0.65) was unanimously approved by MVWG pending system impact study results.

  9. Modular Model Structure - CMPLDW2 • Modular Structure • Add new component models (without modifying main model) • Permit user-written component models • Minimize Input data • Data for load components do not need to be repeated for each instance of model that uses same parameter values • CMPLDW2 input records identify location of data associated with each component and fractions of each component • If composition is the same for a load zone (climate zone), input only once using _CMPLDW2 data management model

  10. CMPLDW2 Model Schematic

  11. CMPLDW2 – Data Input • Format cmpldw2 <busno> “bus name” <bus kv> “id” : #r mva=<value> / disttype distdat / load1type load1datID load1frac / load2type load2datID load2frac / load3type load3datID load3frac / load4type load4datID load4frac / load5type load5datID load5frac / load6type load6datID load6frac / … … … loadNtype loadNdatIDloadNfrac • “X”type is the name of the component sub-model • “X”datID is the identifying number of component’s data management (DM) model • “X”frac is the fraction of load for that component (-1 to indicate 1. - S(other fractions) ) 11 8/26/2016

  12. DG Modeling • Draft NERC/WECC DER Modeling Practice Guideline Note: The threshold is for reference only, not finalized.

  13. Utility scale DG Representation Power Flow Representation

  14. Dynamic Load Representation Dynamic Representation

  15. IEEE P1547 Update • P1547 new requirements work in progress • Fall/Winter 2016, WG final draft to IEEE for ballot… • 1 year balloting of IEEE P1547?

  16. Program Benchmarking Studies • The purpose is to ensure performance uniformity among the programs. • WECC LMTF has already completed a set of benchmarking test cases. • Benchmark methodology: • Simple 2 bus model • Play-in signal of frequency and voltage at the “system” bus • 6 different play-in signals • 6 different load models • NERC LMTF is planning to do more benchmarking studies.

  17. NERC LMTF Updates • Ryan Quint provided updates of NERC LMTF activities. There are a total of 14 tasks. • Task 1: Technical Reference Document http://www.nerc.com/comm/PC/Documents/Dynamic%20Load%20Modeling%20Tech%20Ref%202016-06-07.docx • Task 5: Improved Protection System Modeling Progressive motor stalling and tripping approach • Task 9: Reliability Guideline: Load Composition NERC is developing a reliability guideline on developing load composition data. • Task 13: Distributed Generation Modeling Guidance • All the NERC LMTF presentations are available on NERC website. NERC LMTF is planning to host a NERC webinar on load modeling in fall 2016.

  18. Miscellaneous • Power Electronics load • MEPPI sensitivity study • BPA single-phase and three-phase motor model • PNNL data request for load composition model and load protection model

  19. Renewable Energy Modeling

  20. REMTF Charter • The purpose of the REMTF is to lead the technical efforts to develop generic, nonproprietary renewable generator and energy storage models for planning studies. • Specific responsibilities include: • Development of specifications for generic, non-proprietary, positive-sequence power flow and dynamic models for solar, wind, and energy storage, for use in bulk power studies • Coordination of implementation of models in commercial simulation software • Development of model application and validation guidelines • Coordination with stakeholders REMTF Charter was unanimously approved by MVWG

  21. REMTF Future Direction Survey Results • The survey is intended to solicit the opinion of power system planners within MVWG of the activities that should be focused on for the next 5-10 years. • The complete results of the Survey can be found on WECC website. • Some immediately applicable results: • Ability to vary the ramping • Ability to simulate interactions among renewables within the same plants (REPC_B) • Ability to simulate unbalanced/unsymmetrical faults • Ability to simulate inertial response

  22. Enhanced Plant Level Control • The REPC_B is the enhanced plant level controller model, and has additional new features, including interface with multiple WTGs, interface with reactive support devices, and plant level power factor control option. • Model spec for REPC_B, memo issued 11/25/14 (revised 1/6/15, 1/20/15, 11/5/15). • The REPC_B model was implemented by all software vendors (GE, Siemens PTI, PowerWorld, and PowerTech Labs). • Comparison were done among the tools, results look good with some discrepancies which are not believed due to this model. Motion: Approve the REPC_B model specification Approve to add the REPC_B model to WECC approved dynamic model list

  23. REPC_A (black) • REPC_B (black + red)

  24. Energy Storage Modeling • Software benchmark testing showed no more differences with the recent fixes. • Draft Energy Storage Modeling document and model validation guideline document are expected in Nov. • Insertion of a simplified version of Energy Storage model to composite load model can be easily done in the near future once the modular composite load model (CMPLDW2) is completed.

  25. Miscellaneous • Wind Turbine Model Validation guideline document – in progress • Advanced pumped storage hydro unit model – the model is available in PTI, REMTF will work on making other platforms available • PVD2 model development – target to have draft in Nov • Wind plant inertial response – can be addressed by vendor specific model, not a high priority at this time

  26. REMTF Education • 1st to 2nd generation renewable models conversion guide • “Model User Guide for Generic Renewable Energy System Models” http://www.epri.com/abstracts/Pages/ProductAbstract.aspx?ProductId=000000003002006525 • REMTF educational website • REMTF didn’t feel the need of more REMTF educational webinars or workshops on renewable energy models. The recordings are available on WECC website. • Software vendors and consultants have agreed to answer questions. Spencer Tacke (MID) will work with WECC staff to get the REMTF “Help” site up and running.

  27. System Model Validation

  28. System Model Validation Studies • SlavenKincic (PeakRC) provided updates of SMVTF activities and Ryan Quint (NERC) provided updates of JSIS activities on behalf of Dmitry Kosterev (BPA). • SMVTF has posted two cases this year, ready to use, for MOD-033. First case represents January 21th event (Colstrip RAS activation) and second one, March 3rd event representing loss of two major 500 kV lines in Pacific Northwest, RAS generation drop ( approximatively 1500 MW) and independent loss of two Navajo units 28 second later. • Both cases can be downloaded from peakrc.org>Model>WSM Library> System Events • This case can be used by PC to help with compliance with MOD-33 standard.

  29. WECC Guideline • SMVTF is developing “Guidelines for Validation of Powerflow and Dynamic Cases for MOD-033-1”. Draft was distributed for comments. • The guideline is meant to provide basic information on how WECC staff and Peak RC prepare the study base cases for model validation. • This guideline now also includes a description of monitoring equipment requirements, and how members can use these cases for model validation. • The guideline will also provide some guidance on identifying unacceptable differences and how to resolve those differences. • The target is to have the guideline for approval at the Nov meeting.

  30. Generator Modeling, Testing, and Model Validation

  31. Excitation Models • IEEE Standard 421.5 was approved. • MVWG plans to review and update the exciter models following the IEEE standard in effect

  32. Hydro Turbine Governor Model • John Undrill has been working with BPA on the hydro turbine governor model. • The model represents digital governor logic supplied by American Governor Company, as now in service in many hydro plants in the Northwest • The model validation was completed for Kaplan and Francis turbine plants – Chief Joseph, Little Goose, and Bonneville. • John will provide the pseudo code and test case for software implementation. Motion: Approve the model specification of the hydro turbine governor model h6e Retire h6b model from WECC approved dynamic model list Add h6e model to WECC approved dynamic model list pending software implementation

  33. GENROU, GENSAL, GENTPJ, GENTPF • John Undrill talked about the history of GENROU, GENSAL, GENTPF, GENTPJ models in the previous meeting • GENSAL comes from limitations of analog computers in late 1950s • GENTPJ and GENTPF come from GENROU but with different saturation calculations. • Documentation by Jamie Weber http://www.powerworld.com/files/GENROU-GENSAL-GENTPF-GENTPJ.pdf • Pouyan Pourbeik, etc. recently submitted a paper on generator modeling that relates genrou, gensal, gentpfand gentpj model back to the origins of fundamental machine theory, and gives clear evidence on the better performance of gentpf and genpj as compared to genrou and gensal, for both round rotor and salient pole machines.

  34. GENROU, GENSAL, GENTPJ, GENTPF • GENSAL should not be in use – already retired • GENROU cannot capture • Transient dynamics of Ifd properly in all cases (gentpf can) • Steady-state value of Ifd over entire operating range of the machine due to not modeling saturation variations with machine loading (Kis in gentpj) • Should consider changing all generators to gentpf at the minimum, and then to gentpj when Kis can be estimated (When Kis=0, gentpj=gentpf) • OEM data is used – data does not change, just change the model

  35. GENROU, GENSAL, GENTPJ, GENTPF • Per request from May TSS meeting, Pouyan Pourbeik developed the white paper “The recommended Synchronous Generator Model: GENTPJ”. • The white paper explains why GENTPJ should be used and the conversion from GENROU and GENSAL to GENTPJ. Motion: Approve the white paper on GENTPJ – “The recommended Synchronous Generator Model: GENTPJ”.

  36. Dynamic Data Error List • Saturation value check is added to the list based on NERC case quality metrics • Smaller than 20MVA units were removed from the list, Kent Bolton (WECC) will double check the aggregated amount is not a significant value. • Bo Gong (Columbia Grid) and Guihua Wang (BC Hydro) will continue to support on identified UFLS gen errors.

  37. HVDC Modeling

  38. HVDC Modeling • Conventional HVDC point-to-point dynamic model • Final memo and model sent to software vendors • Beta implementation and test in progress • Target to have model spec and model for approval in the Nov meeting • VSC HVDC point-to-point dynamic model • The proposal is to start with voltage source behind reactance model • Pouyan has put together a proposal that ABB, Siemens, GE will review • Target to have a user written test version by Nov • TF memo of 11/19/2013 reviewed by HVDCTF and no update needed • ABB is working on a high level document with high level block diagrams indicating the functional features of PDCI and IPP HVDC, no update has been received.

  39. RAS and Relay Modeling

  40. RAS and Relay Modeling • The RAS Modeling & Validation Task Force (RMVTF) will focus on the following areas: • Determine the types of RAS/SPS that exist within each TOP • Work with TOPs to accurately model the RAS that will be able to be used in a transient stability analysis • Work with software vendors to implement the software changes necessary to accommodate this new approach • Perform validation studies to ensure proper modeling and operation of the RAS • Provide recommendations to improve modeling • Create and maintain an archive of all the different types of RAS • Conduct educational workshops • RMVTF Charter was unanimously approved by MVWG

  41. WECC Approved Dynamic Model List

  42. WECC Approved Dynamic Model List • The latest approved dynamic model list is available at https://www.wecc.biz/_layouts/15/WopiFrame.aspx?sourcedoc=/Reliability/Approved-Dynamic-Models-June-2016.pdf&action=default&DefaultItemOpen=1.  • Highlights of changes: • Add note on GENTPF and GENROU that GENTPJ should be used and refer to the white paper “The Recommended Synchronous Generator Model: GENTPJ” • On renewable phase 1 models, add note to include the link to the EPRI Model User Guide to assist in conversion from phase 1 to phase 2 models • Add REPC_B enhanced plant level controller model • Retire hydro turbine governor model h6b and add h6e model • Create a new section called “Renewable Energy Models” and add all renewable models to this section • Dark gray highlighting to be used for models that are not approved • Notes added for PSSE models with different names under different versions

  43. Next MVWG Meetings and Workshops

  44. Next MVWG Meetings & Workshops • South Regional Hands-on Workshop and 1st MVWG Meeting • March 8-10 San Diego • 2ndMVWG Meeting • June 14-16 Salt Lake • North Regional Hands-on Workshop • Aug 30-31 Portland • 3rd MVWG Meeting • Nov 15-17 Salt Lake • Nov 15 pm, System Model Validation TF • Nov 16 am, REMTF (joint LMTF discussions on DG) and PPMVDTF • Nov 16 pm and Nov 17 all day, MVWG

  45. Questions ?

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