Masters Theses

Abstract

"With the advent of multilevel converters for high power applications in industry, a need to develop simpler topologies and control techniques has arisen. The flying capacitor multilevel inverter (FCMLI) is one such topology which is gaining popularity in recent years with many advantages such as extra ride-through capabilities because of the capacitor storage, redundancy in switching states, low common mode voltage ratio, improved power quality, etc. In this thesis, different basic multilevel converter topologies and their advantages and applications are discussed. The thesis mainly focuses on single-phase five-level FCMLI topology. Different control techniques for capacitor voltage regulation like staircase modulation, and PWM techniques including phase disposition PWM (PDPWM), and natural balancing technique are implemented. The disadvantages of these methods are discussed. To overcome these, a new method called the split natural balancing technique which is based on the Unipolar PWM method is proposed in this thesis. In addition, a feedback control technique called amplitude modulation adjustment (AMA) method is devised to regulate the voltage across capacitors around the desired value irrespective of their initial values. Harmonic analysis of the output voltage for all the implemented methods is performed and compared"--Abstract, page iii.

Advisor(s)

Ferdowsi, Mehdi

Committee Member(s)

Chowdhury, Badrul H.
Corzine, Keith, 1968-

Department(s)

Electrical and Computer Engineering

Degree Name

M.S. in Electrical Engineering

Sponsor(s)

National Science Foundation (U.S.)

Publisher

Missouri University of Science and Technology

Publication Date

Summer 2010

Pagination

xiv, 103 pages

Note about bibliography

Includes bibliographical references (leaves 63-65).

Rights

© 2010 Vennela Yadhati, All rights reserved.

Document Type

Thesis - Open Access

File Type

text

Language

English

Library of Congress Subject Headings

Electric current converters -- Design
Electric inverters
Pulse-duration modulation
Redundancy (Engineering)
Switched capacitor circuits

Thesis Number

T 9691

Print OCLC #

689997124

Electronic OCLC #

650088868

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