1. Model Validation in Western Interconnection
Dmitry Kosterev (BPA), Stephanie Lu (PSE),
Donald Davies (WECC)
August 2011

2. System Model Validation
NERC conducted a model validation conference in Charlotte in June 2011
Each interconnection develop processes for system model validation
WECC Needs:
Powerflow validation base case
Synchronized wide-area system response
Tools for model comparison

3. System Model Validation Moving Forward
System model validation is a deliverable under the Western Interconnection Synchro-phasor Program (WISP)
Objective is to conduct regular system model validation in WECC starting June 2012
Frequency response
Inter-area power oscillations
A good baseline of oscillations exists in WECC
Delayed voltage recovery

4. Powerflow Snapshot Powerflow snapshot of pre-disturbance conditions:
WECC has a West-wide System Model (WSM) – a state-estimator case for the entire interconnection
Improvements of state estimator model are needed (particularly wind power plant models)
WECC RFPs for linking WSM with dynamic data – two approaches:
Make dynamic data compatible with WSM
Transfer initial conditions from WSM to WECC planning model

5. System Model Validation Studies
WECC Powerflow Case:
Bus-branch
Bus number, ID
WSM Powerflow Case:
Node-breaker-element
Element Code 2
WECC Dynamic Database:
Bus number, ID
WSM Dynamic Database:
Element code, node 1

6. System Model Validation Studies
Two pilot options:
Option 1:
Convert WECC dynamic data base to “element code” definition consistent with WSM (one time effort)
Validation studies are done using WSM powerflow case and the new dynamic data file
Option 2:
Map generation, loads and equipment status from WSM to WECC powerflow case
Validation studies are done using WECC powerflow case and existing dynamic database

7. System Model Validation Studies
WECC send out RFP – nine good responses
Option 1 (long-term)
WECC selected primary and secondary options, in contract negotiations
WECC RC needed additional work at Areva EMS
Option 2 (near-term)
WECC staff / BPA developed a mapping for generators from WSM labels to WECC powerflow bus numbers and IDs
Tools will be needed for checking WSM powerflow data

9. System Model Validation Moving Forward
Model Validation Tools
You run a simulation of a disturbance event and the model does not match the actual data. What to do next ?
Instead of matching simulations and models point by point, we focus on matching features of the response and understanding of its sensitivities to model parameters
This is an area where WECC MVWG funds can be applied

10. Contact Information
System studies:
Donald Davies, WECC Staff,
Dmitry Kosterev, BPA,
Stephanie Lu, PSE,