DTS Experiences at Minnesota Power

Tom Chambers2008 EMS Users Conference

Atlanta, GA

Credits to…• Matt Novitzki

– Programmer Analyst Senior

• Paul Koskela– Engineer Senior

• Mark Pinney– Operations Trainer

• Rick Liljegren– System Operations Manager

• Vendor Personnel

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

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

Implementation

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

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

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

Post-Upgrade

• Reran FAT In-house (SAT)

• Generated, Installed Fixes and Tested many Problem Reports

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

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

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

Experiences

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)

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. 18th 2007 separation)

MP Model…• ~250 Internal Busses• ~1000 External Busses

• Features– DC Line– Seasonal Limits– Special Protection and Runback Schemes– Automatic Contingency List

DTS Staff…

• System Operations Trainers(2)

• System Performance Engineer

• ITS EMS Support Programmer/Analyst

• None are full time DTS!

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

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

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

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

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?

Case Study

Day 1: Restoration Drill

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

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)

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

Case Study: Restoration Drill

• Scenario 6: Bus/Transformer Lockout

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

Case Study: Restoration Drill

• Scenario 9: Most Severe Contingency – Part II – Event happens– Implement TSM Plan developed earlier– Check for new Most Severe Contingency

Case Study

Day 2: Blackstart

Observations• DTS has finally matured• DTS Requires Significant Support

– Engineering– Programming– Training

• Powerful Tool– Real life results can be achieved– Accepted by Operators

Questions?