ERIC VANDENBURG, SPENCER HOMAN, and TREVOR LARSON Team website: 1

Table of contents:  Problem statement  Project learning  Design specifications  Current design  Pros & Cons of current design  Constraints  Ideas  Load information  Budget  Schedule  Goals 2

Problem description:  The purpose of this project is to redesign the auxiliary power system on the Advanced Electric Ship Demonstrator (AESD) to address the current shortcomings it possesses. It is important to perform a feasible study on this because the current power system has been found as a limiting factor in how well the ship can conduct necessary testing. 3

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 4

Current Design: 5

What is an uninterruptible power supply (UPS): 6

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. (possibly an idea)  Batteries capable of providing power for 1 hour.  Shorten length of charge time to less than 3hours 7

Pros & Cons of existing design:  Cons UPS’s create acoustic noise Load balancing with UPS’s UPS’s discharging to fast, weak batteries Charge time Run time  Pros Uninterruptible power supply Already implemented ○ Cheap 8

Constraints:  There are not to many constraints with this project the one that we keep in mind is space on the ship. 9

Options to consider for design  Lead-acid  Lithium ion battery system  Fuel cells (not feasible) Size needed for storage cost  Back up battery banks  Inverters, voltage protection, relays, buck/boost converters…..  Same designs but using different battery types 10

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  Design 11

New Design schematic 12

New design schematic 13

New design schematic 14

New design schematic 15

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. 16

Budget:  Since this is a design project with no prototypes our budget is limited to site visits. 17

Schedule:  Design review November 18, 2010  Research battery bank designs by November 19, 2010  Research cost of battery banks by November 30, 2010  Create design by December 2, 2010  December 3, 2010 snapshot day  December 9, 2010 design report and website due  December 9, 2010 log books due 18

Goals for next semester  (3) Detailed designs  Lead-acid battery design  Lithium-ion battery design  Other  Documentation  Choosing specific components with cut- sheets  Choose the best design for Expo 19

Questions: 20