MODELING AND TOPOLOGY EVALUATION FOR RECTIFIER CIRCUITS IN MEDIUM VOLTAGE DIRECT CURRENT SYSTEM
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Authors
Kinney, Daniel T., Jr.
Subjects
MVDC
rectifier
modular multilevel converter
thyristor
performance
metrics
simulation
power
converter
topologies
modeling
design
rectifier
modular multilevel converter
thyristor
performance
metrics
simulation
power
converter
topologies
modeling
design
Advisors
Oriti, Giovanna
Zhang, Di
Date of Issue
2021-09
Date
Publisher
Monterey, CA; Naval Postgraduate School
Language
Abstract
Naval ship propulsion design is evolving from the traditional structure with a main engine driving a shaft through a reduction gear, to a new architecture that uses electric drives powered from a direct current (DC) power distribution system. The goal of this thesis is to compare different medium voltage rectifiers interfacing an alternate current (AC) generator to a DC bus which can power the ship propulsion system. Power quality and efficiency of the power converters are the parameters used to compare four different rectifier circuit topologies: 2-level converter, 3-level converter, modular multi-level converter, and modular multi-level rectifier. Converter operating principles, design trade-offs, modeling characteristics, performance, and naval shipboard applicability are discussed in detail. Using a power electronics simulation platform, the four power rectifier circuits and their controls are connected between a 6.6kV AC generator and a regulated DC bus that represents the shipboard platform. Inside each rectifier circuit, thermal properties of the chosen semiconductor switching devices and diodes are built in and losses are captured and analyzed in steady state operation. This study shows that the modular multi-level rectifier circuit is the most efficient, easiest to maintain, and the recommended topology for Naval shipboard applications.
Type
Thesis
Description
Series/Report No
Department
Electrical and Computer Engineering (ECE)
Organization
Identifiers
NPS Report Number
Sponsors
Funder
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Citation
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.