1 Team BUSS Backup Storage Source

2 Team BUSS Backup Storage Source EHV Substation Second DC Storage Source Sponsor Idaho Power Company Team Members Rob Butzer Mitch Colburn Brian Vandenburg

3 Presentation Outline Project Background Customer Needs Reliability Analysis Alternatives Analysis

4 Presently, substation backup battery systems are a single point of failure within the power system In the eastern U.S., utility companies are required to have dual battery backup system in any substation over 230kV Project Background

5 Operates station control equipment (communication, relays, breakers, alarms) Battery bank used during power outages to maintain control of substation DC System

Project Background6 One Line Diagram

Project Background7 Bank of up to 60 cells Each cell rated at about 2.1V Nominal Voltage of ~130V DC Battery Bank

Project Background8 Continuous load draws 5.5A for 8 hours to maintain station control Momentary load of A to be supplied after 8 hours for breaker control Minimum Voltage ~105V Battery Bank Sizing

9 1. Calculate reliability of present DC battery system 2. Seek alternatives for a backup dc storage supply and evaluate added reliability 3. Implement scaled prototype on a bench top system Customer Needs

10 50 faults * = 1.06 failures/year Present Fault Tree

11 Projected Fault Tree

12 Evaluation Basis: 1. Reliability 2. Cost 3. Maintenance 4. Life Expectancy Alternatives

Alternatives13 Economical Analysis Initial Cost $10,548 Battery Rack $1,460 Maintenance Cost ~$13,000/year

Alternatives14 Ultracapacitors High Initial Cost Low Maintenance Environmentally Friendly

Alternatives15 Fuel Cells High Initial Cost Low Maintenance Environmentally Friendly Needs Energy Partner

Alternatives16 DC Generator Set Low Initial Cost High Maintenance Cost

Alternatives17 Flywheel Low Initial Cost Low Maintenance Cost Not a stand alone source

Alternatives18 Dual Battery Backup Low Initial Cost High Maintenance Cost Field tested

Alternatives19 Nuclear Power Plant Very High Initial Cost Lots of Maintenance Terrible for Environment

20 Project Timeline

Project Background21 Discussion Conclusion