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Gareth Lim Lead, EMS Engineering

Gareth Lim Lead, EMS Engineering. West-wide System Model (WSM): Building and Maintaining the WSM Model August 22 nd , 2012. WECC Balancing Areas Footprint. West-wide System Model (WSM). WECC WSM:

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Gareth Lim Lead, EMS Engineering

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  1. Gareth LimLead, EMS Engineering West-wide System Model (WSM): Building and Maintaining the WSM Model August 22nd, 2012

  2. WECC Balancing Areas Footprint

  3. West-wide System Model (WSM) • WECC WSM: • Is an operational model used by the WECC Reliability Coordination offices to provide situational awareness and real-time supervision of the entire Western Interconnection • Consist of a Full Node-Breaker model, depicting breaker configuration details (e.g. ring-bus, breaker-and-half, main-bus-aux-bus, double-breaker configurations .. etc) • Is integrated with real-time telemetry (via ICCP) providing situational awareness of the flows and loading of the transmission system

  4. West-wide System Model (WSM) • WECC WSM is a product of the three existing RCO models (RDRC, CMRC, and PNSC) • CIM XML formatted Models (RDRC & CMRC) & Areva EMS Netmom (PNSC) were merged • Merged Model required clean-up: removal of duplicate lines & substations, standardization of basic modeling methodology & naming conventions • Result: West-wide System Model (WSM) Areva EMS Netmom PNSC (Areva) CMRC(ABB) RDRC(GE Harris)

  5. West-wide System Model (WSM) • West-wide System (WSM) Network Model is supported by the following additional models / databases, used to support the Reliability Coordinator Real-Time Applications: • Scada Model • ICCP Model • Alarm Model • Contingency Definitions Model • Remedial Action Schemes (RAS) Model

  6. West-wide System Model (WSM) • Network Model: • 12,000+ Busses Model (dynamic) • 7,600+ Busses Above 100kV • 6,900+ Substations • 11,000+ Transmission Lines • 5,100+ Transformers • 3,000+ Generating Units • WSM Model is updated every 4 – 6 weeks (or as needed to address critical model issues)

  7. West-wide System Model (WSM) • Real-Time Telemetered Data • 98000+ Real-Time Telemetry (ICCP) • 47,000 Analog Measurements • 51,000 Status Measurements • Measurement Observability Redundancy Ratio = (No. of Analog Measurements) / (No. of State Variables to be Solved for)

  8. West-wide System Model (WSM) • Model Build Process: • Transmission Owners / Balancing Authorities submit Model Data 30-days in advance of transmission & generation changes (equipment parameters, substation breaker one-lines, estimated in-service dates) • WECC RC Modeling Engineers update the WSM Network Model with the associated modeling changes • WECC RC Modeling & Study Engineers create / update the other supporting EMS models / databases – i.e. Scada model, ICCP model, Alarm model, Contingency Definitions model, RAS model • WECC RC Applications & Study Engineers validate the new EMS model release in the Testing environment • WECC RC Modeling Engineers update the one-line displays • New EMS model release is deployed

  9. West-wide System Model (WSM) • Model Data Submission Method: • Incremental Model Submission • Individual Substation breaker one-line diagram • Modeling Parameters in emails, spreadsheets • Full Model Submission • System / Overview Switching One-lines • Alstom Netmom database • Individual Entities’ PSLF cases • WECC Planning Basecase • Modeling Parameters in spreadsheets, official documents(e.g. FAC-009 Facility Equipment Ratings)

  10. West-wide System Model (WSM) • Model Data Submission Method: • Submission Method: • E-mail submission via the WSMModelUpdates WECC distribution list (WSMModelUpdates@wecc.biz) • Secure Email Message / Inbox • WECC FTP site • Submitter: • Operations Personnel / EMS Personnel / Planning Personnel – Dependent on each entities’ policies and procedures

  11. WSM Model Update Process

  12. WSM Model Update Process • Modeling in E-terrasource • Validating & Exporting Basecase Model + Projects • To ensure no basic modeling errors were made • Running Basecase Powerflow Solution • To ensure no ‘major’ topological error or incorrect modeling parameters were made – causing powerflow divergence / abnormal voltage solutions • Map & Remap Real-Time ICCP measurements

  13. WSM Model Update Process • Create the Scada, ICCP & Alarm Models • To provide measurement observability for alarming & network applications monitoring • Running State Estimator Solutions • To ensure model is consistent with the available set of mapped measurements • To tune the State Estimator solution parameters with the updated model topology & measurement set

  14. WSM Model Update Process • Add & Update Contingency & Remedial Action Schemes (RAS) Definitions • To ensure contingency definitions & RAS definitions are consistent with the updated model topology • Running Contingency Analysis Solution • To ensure no topological error or contingency definition error causing unsolved / invalid contingency solutions • Update Substation & Overview one-line displays • To ensure proper visualization of the updated transmission system topology

  15. Modeling in E-terrasource • Model Update Process: • WECC RC Modeling Engineers use the Alstom E-terrasource modeling tool to build • Each modeler works in their own independent workspaces • Allows for parallel modeling - can have different models & projects loaded • Avoids the issue of shared resources • Avoids the risk of “one-corrupts-all” • Avoids the need for close-coordination of work (e.g. when performing validation, model export) • Each modeler begins with the latest Model Authority Set – MAS (most recent model “basecase”) to create their projects • Model Integrator integrates the projects together, validates, and create a new MAS

  16. Modeling in E-terrasource Network ParameterData

  17. Modeling in E-terrasource Node ConnectivityData Node 900C Node 900D

  18. Modeling in E-terrasource Graphical Modeler

  19. Map & Remap Real-Time ICCP Meas • ICCP MappingUpdate Process: ** Actual ICCP Object IDs have been ‘masked’ due to confidentiality of ICCP Object IDs

  20. Add & Update Contingency Definitions • Contingency Update Process: • Breaker-to-Breaker Contingencies • Lines: Greater 100 kV (excluding radial lines) • Transformer: Low-side greater than 90kV • Units: MW Capacity greater than 50 MW

  21. Update Substation & Overview one-lines • WSM Model – Cholla Substation One-line 500kV

  22. Update Substation & Overview one-lines • WSM Model – Cholla substation on APS Overview

  23. Model Testing • State Estimator Testing • Contingency Analysis Testing • Alarm Testing • Display Verifications • ICCP Data Verifications

  24. West-wide System Model (WSM) • Model Export Formats: • PTI Raw File Format • Mapping done via Alstom Translation Table Mapping, manually maintained by WECC RC Modeling Staff • Alstom Netmom Savecase • CIM version 12 • Powerworld CSV File Format ** WSM is available to signatories of the WSM License Agreement or the Universal NDA

  25. Continuous Model Validation • Running state estimation once every minute results in continuous model validation • WECC RC is enhancing tools to better identify topology errors, model errors, and measurement errors that contribute to incorrect state solutions • WECC RC has 24x7 monitoring support of the State Estimator solution quality

  26. Reconciliation of Models:WSM Model & WECC Planning Basecase (BCS) Model

  27. WSM Model vs. WECC Basecase • WSM Model • Real-Time Operational Model used by the WECC RC • Contains Real-Time Telemetry, and Best Estimate of Current State of the System – Energy Usage, Generation Outputs, Transmission Loading, .. etc. • Updated by WECC RC Modeling Staff • WECC Basecase (BCS) • Planning Model used by the Planning Community • Contains Generation Dynamic Data • Updated by WECC Planning Community

  28. Reconciliation: Potential Challenges • Differences between WSM and WECC BCS • Differences in Modeling Granularity • WSM: 12030 Busses, BCS: 18012 Busses • 9774 of 18021 buses in WECC BCS (2012) is not matched in WSM model • Largely attributed to lower kV (69kV & 46kV) systems not modeled in WSM model • Differences in Modeling Time Horizon • WSM models current, and near future, WECC BCS models seasonal models, including future anticipated projects • Differences in Area Modeling • WSM model is based (for the most part) on Balancing Area footprints, BCS is based on Regional footprints (e.g. Northwest Region)

  29. Reconciliation: Potential Challenges • Differences between WSM and WECC Basecase • Differences in Substation / Bus Topology Details • WSM model contains Full Node Breaker Detail vs. BCS contains Bus-Branch Representation • BCS using Jumpers to represent bus tie breakers • WSM model bus-branch equivalent is dynamic, depending on breaker switching in the case created • WSM model explicitly models each series capacitors as a separate line segment • WSM model contains zero-impedance branches to appropriately model metering locations “Behind-the-Shunt-Reactor” “Transformer Balancing Authority Ties” “Bus-Tie Balancing Authority Ties”

  30. Reconciliation: Potential Challenges • Differences between WSM and WECC Basecase • Differences in Generation Modeling • Inclusion / Exclusion of Generator Step-up Transformer • Inclusion / Exclusion of Station Service / Auxiliary Load i.e. Net Generation vs Gross Generation Modeling • Aggregation of multiple generating units at a bus / substation e.g. Wind Turbines, High-Pressure-Low-Pressure Turbines

  31. Reconciliation: Example Difference • Planning Basecase – Cholla 500kV (1-bus)

  32. Reconciliation: Example Difference • WSM Model – Cholla 500kV (4-busses)

  33. Reconciliation: Example Difference • WSM Model – Cholla 500kV (4-busses)

  34. Reconciliation: Example Difference • WSM Model – Cholla 500kV (4-busses)

  35. Gareth Lim Lead, EMS Engineering glim@wecc.biz Questions?

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