TEAM STEADY SUPPLY

1. ERIC VANDENBURG, SPENCER HOMAN, TREVOR LARSON and NIK URLAUB Team website: http://seniordesign.engr.uidaho.edu/2010-2011/microgrid/ TEAM STEADY SUPPLY

2. Table of contents: • Background • Problem Definition • Uninterruptible Power Supply (UPS) • Current Design • Design specifications • Load information • Proposed Design # 1 • Constraints • Proposed Design # 2 • Ideas • Design Tradeoffs • Budget • Schedule

3. Background: • Advanced Electric Ship Demonstrator (AESD) also known as “Sea Jet” • 1/4 scale model, Length: 133 feet, Weight: 239,000 lbs, Location: Bayview, Idaho • AESD is used for a variety of different tests and experiments (eg. Acoustic data collection, Hull modification, Motor types) • Propulsion System is powered by 720 12V@40A/Hr Batteries • Auxiliary System is powered by 4 UPS • Shore power, Diesel Engine used for charging

4. Problem Definition: • This is a Feasibility Study with the following objectives: • Replace the Four Uninterrupted Power Supplies (UPS) • Provide Uninterrupted Power Flow to Every Auxiliary Load. • Increase the Duration of Battery Run Time (Increase Quiet Mode Run time) • Decrease Charge Time for Batteries (Decrease Time Between Quiet Mode Runs) • Decrease Acoustic Contamination

5. What is an uninterruptible power supply (UPS): • PROS • UPS provide a Load with power at all times • During connection to Shore/Diesel Generator, Load is powered and battery is charging. • During Quiet Mode Runs the Battery supplies the Load with power • CONS • UPS are not designed to run on the internal batteries for extended time • UPS are not designed to charge quickly • UPS are not designed to minimize acoustics (Inverters) • 4 UPS = 4 Inverters = Loud SHORT QUIET MODE RUNS LONG CHARGE TIME ACOUSTIC CONTAMINATION

6. Current Design:

7. Design specifications: • Remove the (4) uninterruptible power supplies (UPS) causing unwanted acoustics. • Continuous power supply to the loads at all times. • Draw power from a common bus. • Batteries capable of providing power for more than 45 minutes.

8. Design process: • Brainstormed/researched DC microgrids • Obtained load profiles from NAVSEA • Calculated power consumed by the auxiliary power system • Determined the number of batteries needed

9. Load information: With Onboard Data Acquisition System (ODAS) equipment off: • UPS #1 – 6.0A • UPS #2 – 13.9A • UPS #3 – 2.0A • UPS #4 – 3.3A With ODAS equipment on: • UPS #1 – 17.4A • UPS #2 – 18.5A • UPS #3 – 7.3A • UPS #4 – 3.3A UPS #4 has weak batteries causing ODAS configuration not to be utilized for this unit.

10. Design Schematic# 1

11. Design Schematic # 1

12. Design #1 Calculations

13. Design Schematic # 2 • Auxiliary System ties into Propulsion System • Auxiliary load is roughly a 12% increase to the connecting string • Vital Loads have power at all times • Looking into DC switchboards to connect to multiple strings to divide load

14. Design #2 Calculations

15. Constraints: • Space: Current UPS dimensions approximately 4*(4ft. by 2ft. by 2ft.). Battery dimensions approximately 24*(12 in. by 6 in. by 4 in.) SPACE not a problem. • Cost: Design #2 will be cheaper based on less materials and components.

16. Options Considered • Current Lead-Acid Batteries (12V @ 40A/Hr) • Lithium-Ion Batteries (36.8V @ 50A/Hr) • Fuel cells (not feasible) • Size needed for storage • cost • Back up battery bank for Design # 2 • Types of Inverters, most cost effective and easy to implement

17. Design Tradeoffs

18. Project Learning • Gained knowledge of DC microgrids • A better understanding of one-line diagrams • Basic battery bank design • Site visit • The operations and uses of the AESD

19. Budget: • Site Visit: $70.00 • Expo Poster: $20.00 • Total: $90.00

20. Schedule: • Start of Semester: January 10, 2011 • Detailed Design Review: February 15,2011 • Snapshot Day: March 8, 2011 • Expo: April 29, 2011 • Logbooks Due: May 5, 2011 • Final Report: May 5, 2011

21. Questions: