1. DTS Experiences at Minnesota Power Tom Chambers 2008 EMS Users Conference Atlanta, GA

2. Credits to… Matt Novitzki –Programmer Analyst Senior Paul Koskela –Engineer Senior Mark Pinney –Operations Trainer Rick Liljegren –System Operations Manager Vendor Personnel

3. Today… About Minnesota Power Implementation Experiences Case Studies In-house Restoration Drill (detail) Observations Questions

4. Minnesota Power Small/Medium size (1700 MW Load) Service Territory is Northeast MN Duluth, MN Large Industrial Loads Large flows N to S and W to E DC, Phase Shifters, SVC

5. Implementation Spring 2006 – Upgraded to Rel. 8.1+ –Hardware Upgrades –Enternet Control (Java webapp based UI) –PNA to TSM –DTS (again)

6. Pre-Upgrade TSM In-house Workshop –1 week with Vendor Engineer –Set up system to take advantage of TSM features not in PNA –Resolved Model Problems –Problem Solving –Basic User/Admin Training –TSM Configuration –Produced model for TSM/DTS upgrade

7. Pre-Upgrade DTS Factory Acceptance Tests –System Level Tests –Simulation Initialization Tests –Power System Simulator Tests –Simulation Event Processor Tests –Conditional Event Tests –Data Acquisition and Control Tests

8. Post-Upgrade Reran FAT In-house (SAT) Generated, Installed Fixes and Tested many Problem Reports

9. Post-Upgrade DTS In-house Workshop –1 week with Vendor Engineer –Basic User/Admin Training –DTS Configuration –Problem Discovery and Resolution –Sample Scenario Building DTS In-house Instructor Training DTS In-house User Training

10. Post-Upgrade Converted our System One Line Displays to have Apps and Power System Simulator Views. Matt and Paul Attended the Vendor Power System Applications Users Seminar in Fort Collins, CO

11. Post-Upgrade Internal Model Verification –Vendor Visualization Method db2gml.sh and db2gml_bus.sh scripts yED –Results compared verses One-Line diagrams and model notes

13. Experiences

14. Operator Training Held MISO Restoration Drill –Two Sessions in Fall 2006 –Day 1: Scenarios (basic training) –Day 2: Blackstart (from Hydro) MP Restoration Drill –Three Sessions in Spring 2007 –Day 1: Scenarios (Case Studies) –Day 2: Blackstart (from Hydro)

15. Operator Training Held MISO Restoration Drill –Three Sessions in Fall 2007 –Day 1: Scenarios (more advanced: DC single pole operation, SVS – runback scheme) –Day 2: Blackstart (two island scenario) No Drill in Spring 2008 MP Restoration Drill (Planned) –Three Sessions in Fall 2008 –Day 1: Scenarios –Day 2: Blackstart (Sept. 18 th 2007 separation)

16. MP Model… ~250 Internal Busses ~1000 External Busses Features –DC Line –Seasonal Limits –Special Protection and Runback Schemes –Automatic Contingency List

17. DTS Staff… System Operations Trainers(2) System Performance Engineer ITS EMS Support Programmer/Analyst None are full time DTS!

18. Problems up front… System crashed during Simulation Preparation Controlling a non-modeled point crashed DTS Reloading snapshots failed Could not restart a simulation from a Simulation Data Collection Snapshot

19. Tips… Get DTS Experience before first FAT DTS is only as good as the Model Create a DTS Station/Points –Points can be used for execution of blocks of predefined events immediately through conditional events –Points can be used as flags and/or pseudo timers with conditional events

20. Tips… Be creative –Sequential Control –Custom Applications Do not reinvent the wheel –Scenarios vs. Power System Functionality Script the Scenarios (Library of Scenarios) –Setup, execution and expected results Trainer implemented vs scheduled Scenarios

21. During the past year… Internal Model Improvements Updates to External Model Problem Resolutions Promoted use of DTS and TSM Release 10 Upgrade with DTS enhancements Added 345KV Tie Line with Phase Shifter Used DTS to validate External Model and simulate new 345KV line before in-service

22. Next up… Refine Boundary Model with Telemetry Continue Problem Resolution Continue Promoting use of DTS and TSM System wide dynamic display Additional Frequency mappings into DTS Fall 2008 Vendor Apps Users Group Phasor Measurements?

23. Case Study Day 1: Restoration Drill

25. Case Study: Restoration Drill TSM 101 –Basic TSM Training Execution and TSM Display Review –Provides a means to view system conditions of the snapshot used for the scenarios

26. Case Study: Restoration Drill Scenario 1: Bad Measurement –TSM State Estimator Bad Measurement Summary Scenario 2: Most Severe Contingency –TSM Contingency Analysis: Contingency Case Report –TSM Study Case –Apps View – What-if Analysis –TSM Summaries (Limit Violations)

27. Case Study: Restoration Drill Scenarios 3-5: Special Alarms –Breaker Low Air Pressure –Breaker Low Gas Pressure Breaker Blocked after delay –RTU Failure –Review Alarm Book –Discuss Impacts –Call Company Experts

28. Case Study: Restoration Drill Scenario 6: Bus/Transformer Lockout

37. Case Study: Restoration Drill Scenario 7: Loss of Communications –Alarm Book Scenario 8: Tie Line Fault –Discuss procedures for restoring a tie line with another company

38. Case Study: Restoration Drill Scenario 9: Most Severe Contingency –Part II – Event happens –Implement TSM Plan developed earlier –Check for new Most Severe Contingency

39. Case Study Day 2: Blackstart

40. Observations DTS has finally matured DTS Requires Significant Support –Engineering –Programming –Training Powerful Tool –Real life results can be achieved –Accepted by Operators

41. Questions?