Design and Analysis of Multilevel Inverter based on Cascaded Half-Bridge and Three-Phase Unfolder Circuit

In this paper, a multilevel inverter based on cascaded half-bridge and three-phase unfolder is proposed. The proposed inverter design is simulated by using MATLAB Simulink. The converter is designed with four series-connected half-bridge cells and a three-level neutral-point-clamped inverter. The proposed converter is able to produce an output voltage of 230V and a frequency of 50 Hz. There are two modulation techniques implemented for the proposed inverter topology namely; phase-shifted modulation and phase opposition disposition modulation. The basic principle of operations using both modulation techniques including the performance analysis are presented.