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TEAM STEADY SUPPLY

ERIC VANDENBURG, SPENCER HOMAN, and TREVOR LARSON

Team website: http://seniordesign.engr.uidaho.edu/2010-2011/microgrid/

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

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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.

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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

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Current Design:

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What is an uninterruptible power supply (UPS):

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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

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Pros & Cons of existing design:

ConsUPS’s create acoustic noiseLoad balancing with UPS’sUPS’s discharging to fast, weak batteriesCharge timeRun time

ProsUninterruptible power supplyAlready implemented

○ Cheap

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Constraints:

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

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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

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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

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New Design schematic

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New design schematic

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New design schematic

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New design schematic

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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.

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Budget:

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

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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

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Goals for next semester

(3) Detailed designsLead-acid battery designLithium-ion battery designOther

Documentation Choosing specific components with cut-

sheets Choose the best design for Expo

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Questions: