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

2. Table of contents:  Background  Problem Definition  Uninterruptible Power Supply (UPS)  Current Design  Design specifications  Load information  Proposed Design # 1  Constraints  Proposed Design # 2  Proposed Design # 3  Ideas  Design Tradeoffs  Budget  Schedule 2

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 3

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 4

5. What is an uninterruptible power supply (UPS): 5 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: 6

7. Design specifications:  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.  Remove the (4) uninterruptible power supplies (UPS) causing unwanted acoustics 7

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.  Would it be feasible to run auxiliary loads off of the propulsion system. 8

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. 9

10. Design Schematic # 1 10 Estimated run time: 46.997 minutes

11. Design #1 Calculations 11

12. Constraints:  Space: Current UPS dimensions 4*(4ft. by 2ft. by 2ft.). Battery dimensions 24*(12 in. by 6 in. by 4 in.) SPACE not a problem.  Cost: Compare each design (Comparison in tradeoff Table) 12

13. Design Schematic # 2 13  Auxiliary System ties into one battery string of the Propulsion System  Auxiliary load is roughly only 12% of Propulsion load. Propulsion System will be able to support auxiliary system.  Vital Loads have power at all times  Estimated run time: 1 Hour 45 minutes

14. Design #2 Calculations 14

15. Design Schematic # 3 15  Auxiliary System ties into all 6 battery strings of the Propulsion System  Auxiliary load is roughly only 1% of Propulsion load. Propulsion System will be able to support auxiliary system.  Vital Loads have power at all times  Estimated run time: 21.399 Hours

16. Design # 3 Calculations 16

17. 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

18. Design Tradeoffs 18

19. Project Learning  Gained knowledge of DC microgrids  A better understanding of one-line diagrams  Basic battery bank design  Better team communication  Site visit  The operations and uses of the AESD 19

20. Budget:  Site Visit (2): $308.80  Poster: $75.00  Total: $383.80 20

21. 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

22. Questions: 22