Publication:
MODELING AND CONTROL OF A MODULAR MULTILEVEL RECTIFIER

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Authors
Sledge, Thomas B.
Subjects
MVDC
MMC
rectifier
modular multilevel converter
MMR
medium-voltage direct current
medium-voltage alternating current
modular multilevel rectifier
Advisors
Oriti, Giovanna
Zhang, Di
Date of Issue
2022-03
Date
Publisher
Monterey, CA; Naval Postgraduate School
Language
Abstract
Medium-voltage direct current (MVDC) systems will be the backbone of power systems in the future naval fleet due to its numerous benefits compared with the existing medium-voltage alternating current (MVAC) systems. The rectifier is a key component in an MVDC system that converts the AC electrical power from ship generators to DC power for further transmission and distribution. The power density, efficiency, and power quality of the rectifier are critical to successfully implement an MVDC system. The goal of this thesis is to further improve the benefits of a new rectifier topology, the modular multilevel rectifier (MMR), by designing and implementing control system improvements. Using a real-time simulator, the MMR control system improvements were tested by simulating a system comprised of an MMR converting power from a 6.6 kV AC generator to a stable 12 kV DC bus. The various control improvements were tested against benchmark simulation results. This study shows that the control system improvements enhance the MMR power quality and reduce the number of required components making the MMR an ideal choice for naval MVDC systems.
Type
Thesis
Description
Series/Report No
Department
Electrical and Computer Engineering (ECE)
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NPS Report Number
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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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