'Institute of Electrical and Electronics Engineers (IEEE)'
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 an 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
