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January TSS J. Gronquist, S. Kincic

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1 January 23 2014 TSS J. Gronquist, S. Kincic
Node-breaker model January TSS J. Gronquist, S. Kincic

2 West-wide System Model (WSM) as example of node-breaker model
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 PNRC (Areva) CMRC (ABB) RDRC (GE Harris)

3 West-wide System Model (WSM) - usage
WECC RC (Peak Reliability) run SE every minute and RTCA every 5 minutes; Next day operation studies; Near real time studies as needed; Used for update for BPA and CAISO SE external model; Providing access to WECC members to advanced applications; Post cases in PTI30 and .csv format daily at

4 WSM vs. basecase Planning Basecase – Cholla 500kV (1-bus:14000)

5 WSM vs. basecase (bus number)
WSM Model – Cholla 500kV (4-busses)

6 WSM vs. basecase WSM Model – Cholla 500kV (4-busses)

7 WSM vs. basecase WSM Model – Cholla 500kV (4-busses)

8 Node-breaker vs. bus-brunch model:
Node-breaker model is more flexible: It can represent all operating conditions; Allows more accurate modeling of RASs (SPS) and contingencies; There is usually no convergence problems; Can easily be benchmarked against measurements; Event analysis-SE case is saved automatically; Corrective switching action; Needs for more frequent studies-renewable resources ; Dynamic assessment of SOLs; Stuck breaker; Lot of base-cases;

9 Model Detail To the right is a redacted detail of what the topology of the 500 kV bus at Grand Coulee It’s a Breaker and a Half configuration This would be a single bus in a “planning case”

10 Planning Case Bus View

11 Breaker a4 Out for Maintenance
Now what happens when Line A is taken out of service?

12 Invalid Contingency Simulations Example 2
Line D isolated from Line B and Line C

13 PSLF PSLF to read WSM in node breaker format in V19;
PSLF to match .dyd file to WSM using EMS names;

14 WSM vs. basecase (WSM in PSLF)

15 Building node-breaker model
Model Update Process: WECC RC Modeling Engineers use the Alstom E-terrasource modeling tool to build (RC’s BCCS) 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 Parameter Data

17 Modeling in E-terrasource (GUI)
Node Connectivity Data Node 900C Node 900D

18 Modeling in E-terrasource (GUI)
Graphical Modeler

19 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

20 Continuous Model Validation
Running state estimation once every minute results in continuous model validation; Comparing measurements (kV, MW, MVARs) to powerflow solution; Peak Reliability has 24x7 monitoring support of the State Estimator solution quality;

21 Model Validation-Dynamic
System event: Arlington plant trip and loss of Palo Verde unit on 04/07/2012 Differences: Some difference in in initial conditions; Differences in power flow data; No plant load in WSM; Not all units are matched in .dyd file; Composite load model used with base-case; WSM in TSAT and base-case in PSLF;

22 Progress update: dynamic

23 Progress update: dynamic

24 Questions?

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