A Novel Symmetrical Boost Modulation Method for qZS-based CHB Inverters

Abstract

Quasi-Z-source cascaded H-bridge (qZS-CHB) inverters are arising as an innovation in the fieldof the electrical conversion for PV applications. This type of converters inherit the advantages ofmultilevel inverters and single-stage configuration. In this context, this paper proposes a novel symmetrical boost modulation strategy for qZS CHB multilevel inverters to increase the performance in terms of voltage stresses and power quality. The novelty lies in the adoption of a different concept to generate the shoot-through states compared to the traditional methods. Simulation analysis in a grid connected application to evaluate the benefits of this boost method is performed in the MATLAB/PLECS co-simulation platform.