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Team BUSS

This presentation outlines the analysis and evaluation of backup DC storage solutions for EHV substations, focusing on reliability and customer needs. We examine the current DC battery bank system's performance, which includes up to 60 cells with a nominal voltage of ~130V supporting continuous and momentary loads. The project aims to calculate the reliability of the existing system, explore alternative backup solutions—including hybrid systems—and implement a scaled prototype for testing. Key findings will inform decisions on reliability, cost, maintenance, and life expectancy to enhance operational control during outages.

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Team BUSS

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  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. Background • In EHV substations, battery banks are used to maintain operational control of the substation when ac power is lost • The banks are able to control the relays and breakers, both used to help re-energize the system

  5. Present DC Battery Bank • Bank of up to 60 cells • Each cell rated at about 2.1V • Nominal Voltage of ~130V

  6. Present Battery Sizing • Continuous load draws 5.5A for 8 hours to maintain station control • Momentary load of 142.8 A to be supplied after 8 hours for breaker control • Minimum Voltage ~105V

  7. Present System One Line Diagram

  8. Customer Needs 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

  9. Present Fault Tree 0.000068*525,600 min/year = 35.7 min/year

  10. Parallel Batteries

  11. Parallel Battery Systems 4.624*10^-6*31,536,000 sec/year= 0.146 sec/year

  12. Alternatives Evaluation Basis: 1. Reliability 2. Cost 3. Maintenance 4. Life Expectancy 5. Size

  13. Choice Matrix for Alternatives

  14. Viability of Alternatives

  15. Hybrid System:Battery & UCaps • Initial Cost: ~$1000 plus battery resized? • Battery used for continuous • Ucaps used for momentary

  16. Hybrid System:DC Generator & UCaps • Initial Cost: ~$1500 • Generator used for continuous • Ucaps used for momentary

  17. Bench Top System • The goal of the bench top system is to show the effectiveness of a hybrid system and how it may be implemented in a EHV substation

  18. Bench-Top Testing This is the one line diagram for the bench-top system that is currently being designed

  19. Project Timeline

  20. Conclusion Discussion

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