ERIC VANDENBURG, SPENCER HOMAN, TREVOR LARSON and NIK URLAUB Team website: / 1.
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Transcript of ERIC VANDENBURG, SPENCER HOMAN, TREVOR LARSON and NIK URLAUB Team website: / 1.
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TEAM STEADY SUPPLY
ERIC VANDENBURG, SPENCER HOMAN, TREVOR LARSON and NIK URLAUB
Team website: http://seniordesign.engr.uidaho.edu/2010-2011/microgrid/
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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
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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
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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
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What is an uninterruptible power supply (UPS):
PROSUPS provide a Load with power at all timesDuring 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 timeUPS 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
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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
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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. Would it be feasible to run auxiliary
loads off of the propulsion system.
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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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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)
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Design Schematic # 2Auxiliary 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
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Design Schematic # 3Auxiliary 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
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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
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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
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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