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, donald@wecc.biz • Dmitry Kosterev, BPA, dnkosterev@bpa.gov • Stephanie Lu, PSE, Stephanie.Lu@pse.com