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?