Feed-Forward Space Vector Modulation for Single-Phase Multilevel Cascaded Converters With Any DC Voltage Ratio
Leon, J.I.
Vazquez, S.
Watson, A.J.
Franquelo, L.G.
Wheeler, P.W.
Carrasco, J.M.
Dept. of Electron. Eng., Univ. of Seville, Seville;
This paper appears in: Industrial Electronics, IEEE Transactions on
Publication Date: Feb. 2009
Volume: 56,
Issue: 2
On page(s): 315-325
ISSN: 0278-0046
INSPEC Accession Number: 10469642
Digital Object Identifier: 10.1109/TIE.2008.926777
First Published: 2008-11-17
Current Version Published: 2009-02-02
Abstract
Modulation techniques for multilevel converters can create distorted output voltages and currents if the DC-link voltages are unbalanced. This situation can be avoided if the instantaneous DC voltage error is not taken into account in the modulation process. This paper proposes a feed-forward space vector modulation method for a single-phase multilevel cascade converter. Using this modulation technique, the modulated output voltage of the power converter always generates the reference determined by the controller, even in worst case voltage unbalance conditions. In addition, the possibility of optimizing the DC voltage ratio between the H-bridges of the power converter is introduced. Experimental results from a 5-kVA prototype are presented in order to validate the proposed modulation technique.
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