A Novel Active Quasi Z-Source Multilevel Inverter with Capacitor Voltage Reduction

Abstract

This study presents an innovative Active quasi-Z source inverter, incorporating extra switches and diodes into the impedance-source network. The innovative topology features two key elements: an AqZS, which improves the inverter's voltage gain, and a Three-level T-type inverter at the forefront. The shoot-through state added to the inverter side pulse sequence optimizes the input voltage by charging and discharging the impedance-source network voltage appropriately, thus improving the overall efficiency. The paper introduces the discontinuous pulse width modulation (DPWM) technique to control the inverter. This control method combined with ST state ensures no additional switching compared to other conventional inverters. The effectiveness and reliability of the proposed method are demonstrated through experimental and simulation results