New modulation scheme for bidirectional qZS modular multi‐level converters

Abstract

This study proposes a dedicated modulation scheme for a bidirectional quasi‐Z‐source (qZS) modular multi‐level converter. The operation principle and a suitable pulse‐width modulation method are proposed. The relation between the modulation index and shoot‐through duty ratio is derived. A formula for calculating the required value of qZS capacitance is given. The simulation results presented in the study validate the operation and the performance of the proposed topology.