Publication:
BEHAVIOR/APPLICATION OF SUPERCAPACITORS INTEGRATED WITH A SHIP’S POWER MANAGEMENT SYSTEM DURING VARYING LOAD CONDITIONS

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Authors
Ralson, Kevin
Subjects
hybrid ship
batteries
DC power
supercapacitor
energy management system
Advisors
Cristi, Roberto
Oriti, Giovanna
Date of Issue
2019-06
Date
Publisher
Monterey, CA; Naval Postgraduate School
Language
Abstract
The goal of this research is to study the implementation of supercapacitors (SCs) into the energy storage system of an electric propulsion system (EPS) on a hybrid-powered vessel. A commercial ship EPS can be designed in a similar fashion as the drive system of a hybrid vehicle. The first commercial hybrid vessels are just now coming online, with a traditional hybrid propulsion system (HPS) consisting of only a battery bank and diesel-electric propulsion. This study looks at adding a bank of supercapacitors to work with the EPS. The addition of supercapacitors to an HPS is advantageous in many ways. SCs can be discharged thousands of times more than a high energy density battery, thus extending the life of the SC bank. One unique characteristic of SCs is their ability to discharge a large amount of energy very quickly, making this trait very useful for vessel operations—for example, during the power take-off and the starting of heavy electrical machinery, which draws an enormous load during the first seconds of start-up. However, the main focus of this study is the EPS during normal sea conditions where a vessel will spend the majority of its lifetime. Computer simulations (using MATLAB and Simulink) confirmed that, with the appropriate control and management, SCs reduce the strain on batteries. Also, the fuel efficiency was shown to be improved when comparing a hybrid propulsion system to a non-hybrid propulsion system.
Type
Thesis
Description
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Department
Electrical and Computer Engineering (ECE)
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Distribution Statement
Approved for public release; distribution is unlimited.
Rights
This publication is a work of the U.S. Government as defined in Title 17, United States Code, Section 101. Copyright protection is not available for this work in the United States.
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