A simple and low cost modulation technique for single-phase multilevel cascade converters based on geometrical considerations

This paper presents a space vector modulation technique for use on a single phase cascaded H-bridge converter. These converters have a modular design and are able to produce output waveforms of high voltage and superior quality. A simple strategy to control the DC voltage ratio between the H-bridges of the multilevel converter is presented, which has a low computational cost, making it ideal for practical implementation without the need for high performance processing. Examples for the single-phase two-cell topology are shown but the proposed technique can be applied to develop space vector modulation methods for a higher number of H-bridges. Simulation results are presented to validate the proposed methods.