Phase-Shifted Carrier Modulation Techniques for Cascaded H-Bridge Multilevel Converters

Phase-shifted carrier modulation is an industry standard in its application to multilevel H-bridge converters. The major advantage of this scheme over level-shifted and space vector modulation schemes is its inherent ability to evenly distribute losses between semiconductor devices. However, until n...

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Bibliographic Details
Published in:IEEE transactions on industrial electronics (1982) 2015-11, Vol.62 (11), p.6684-6696
Main Authors: Townsend, Christopher D., Summers, Terrence J., Betz, Robert E.
Format: Article
Language:English
Subjects:
Bridge circuits
Capacitors
Carriers
control strategy
Converters
Degradation
Degrees of freedom
Electric potential
Harmonic analysis
Harmonics
Modulation
modulation strategy
Multi-level converters
Multilevel
Sorting
StatCom
Switches
voltage balancing
Voltage control
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Summary:Phase-shifted carrier modulation is an industry standard in its application to multilevel H-bridge converters. The major advantage of this scheme over level-shifted and space vector modulation schemes is its inherent ability to evenly distribute losses between semiconductor devices. However, until now, its implementation has necessitated a capacitor voltage balancing scheme that degrades converter harmonic performance. This paper develops two phase-shifted carrier modulation schemes that avoid harmonic degradation by exploiting an extra degree of freedom in the available switching states. Simulation and experimental results are presented that confirm the correct operation of the modulation strategies.
ISSN:0278-0046
1557-9948
DOI:10.1109/TIE.2015.2442516