Self-Balancing Trinary Asymmetric Three-Phase Multilevel Inverter

This paper presents a cascaded H-bridge multilevel inverter with single dc source. The dc link voltages of the H-bridges maintain a trinary asymmetric ratio among them. The inverter generates a phase voltage with seven levels and a line voltage with thirteen levels at unity modulation index. Voltage of the floating capacitor is self-balanced in open loop irrespective of the initial conditions. This is achieved by utilizing the redundancies associated with the space vectors of a three-phase trinary asymmetric multilevel inverter. Regardless of the modulation index and power factor, self-balancing of capacitor voltage is achieved. Simulation of the proposed converter is carried out in MATLAB/ SIMULINK