Unidimensional Modulation Technique for Cascaded Multilevel Converters
Leon, J.I.
Vazquez, S.
Kouro, S.
Franquelo, L.G.
Carrasco, J.M.
Rodriguez, J.
Dept. of Electron. Eng., Univ. of Seville, Seville, Spain;
This paper appears in: Industrial Electronics, IEEE Transactions on
Publication Date: Aug. 2009
Volume: 56,
Issue: 8
On page(s): 2981-2986
ISSN: 0278-0046
INSPEC Accession Number: 10793127
Digital Object Identifier: 10.1109/TIE.2009.2016510
First Published: 2009-03-16
Current Version Published: 2009-07-24
Abstract
This paper presents a simple and low-computational-cost modulation technique for multilevel cascaded H-bridge converters. The technique is based on geometrical considerations considering a unidimensional control region to determine the switching sequence and the corresponding switching times. In addition, a simple strategy to control the dc-voltage ratio between the H-bridges of the multilevel cascaded converter is presented. Examples for the two-cell topology are shown, but the proposed technique can be applied to develop modulation methods for a higher number of H-bridges. Experimental results are presented to validate the proposed technique.
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