Bipolar multicarrier PWM techniques for cascaded quasi-Z-source multilevel inverter

Quasi-Z-source inverters are educed with additional advantages of continuous current from source, lower switch stress and smaller component ratings in addition to buck/boost capability, inversion and single stage conversion of the basic topology of Z-source inverters. This work proposes a novel topology of cascaded quasi-Z-source multilevel inverter. The working and switching states of the proposed topology are explained. Modified multi-carrier bipolar PWM techniques are explicated for the proposed inverter. A five level quasi-Z-source inverter is designed, modeled and the simulation results are obtained. The total harmonic distortion and individual harmonic contribution in each pulse width modulation techniques are performed.