Switching algorithm for single <i>Z</i> ‐source boost multilevel inverter with ability of voltage control

Abstract

This study proposes a new topology of cascaded transformer‐based multilevel inverter using single Z ‐source. The suggested circuit consists of only one Z network and one DC voltage source; as a result installation area is reduced. In this topology, the output voltage amplitude is not limited to DC voltage source similar to traditional cascaded transformer‐based multilevel inverter and can be increased with Z network shoot‐through state control flexibly. Besides, the same as traditional Z ‐source inverter, it is more reliable against short circuit. Also, a particular switching algorithm has been suggested for presented inverter, which can obtain total harmonic distortion (THD) of output voltage nearly constant for different boost ratio. Moreover, as compared to traditional Z ‐source inverter, the THD of output voltage is decreased in the suggested topology. The performance of proposed inverter and switching algorithm are validated with simulation results using MATLAB/SIMULINK software and experimental results based PCI‐1716 data acquisition system.