Novel Hybrid Cascade Asymmetric Inverter Based on 5-level Asymmetric inverter

Abstract

A novel hybrid cascade asymmetric inverter is developed in this paper. The novel inverter is based on connection of multiple single-phase asymmetric 5-level inverter modules. With the dc bus voltage ratio V <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">1</sub> :V <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sub> =1:2, the phase voltage of the novel inverter with two modules per phase will output 13 voltage levels. A new hybrid asymmetric control technique for the inverter is proposed. Spectral analysis of the phase output voltage is carried out. According to the spectral analysis, there is no real power exchange between modules in a phase leg. A two-module three-phase inverter was constructed in the laboratory, experimental results are presented as well as comparison with hybrid diode-clamp cascade inverter is given