Masters Theses


Extended operation of flying capacitor multilevel inverters


Jing Huang

Keywords and Phrases

Voltage balancing


"Recent research in flying capacitor multilevel inverters (FCMIs) has shown that the number of ac voltage levels can be extended by changing to ratio of the dc capacitor voltages. For the three-cell FCMI, four levels of operation are expected if the traditional ratio of the capacitor voltages is 1:2:3. However, by altering the ratio, the inverter can operate as a five-, six-, seven-, or eight-level inverter. According to previous research, the eight-level case is referred to as maximally distended (or full binary combination schema) since it utilizes all possible transistor switching states. However, this case does not have enough per-phase redundancy to ensure capacitor voltage balancing under all modes of operation. In this thesis, redundancy involving all phases is used along with per-phase redundancy to improve capacitor voltage balancing. It is shown that he four- and five-level cases are suitable for motor drive operation and can maintain capacitor voltage balance under a wide range of power factors and modulation indices. The six-, seven-, and eight-level cases are suitable for reactive power transfer in applications such as static var compensation. Simulation and laboratory measurements verify the proposed joint-phase redundancy control"--Abstract, leaf iii.


Electrical and Computer Engineering

Degree Name

M.S. in Electrical Engineering


University of Missouri--Rolla

Publication Date

Fall 2005


vii, 53 leaves

Note about bibliography

Includes bibliographical references (page 62).


© 2005 Jing Huang, All rights reserved.

Document Type

Thesis - Citation

File Type




Library of Congress Subject Headings

Electric current converters -- Design and construction
Electric inverters -- Design and construction

Thesis Number

T 8906

Print OCLC #


Link to Catalog Record

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