Abstract
This paper proposes a modified single phase quasi-Z-source inverter (qZSI) with enhanced boost cabalitiy. The total harmonic distortion (THD) values of output voltage and current are reduced using the unipolar pulse width modulation (PWM) technique. At the same time, the voltage gain ability of the circuit is improved with the help of an additional boost switch connected in parallel with the impedance network and power MOSFETs. The operation of the unipolar PWM technique adapted for the qZSI is explained and the working principle of the proposed circuit with the boost switch is described using mathematical expressions. Simulations are carried out to show the effectiveness of the circuit for different modulation indexes using Matlab/Simulink environment. Compared with the classic qZSI topologies, the presented circuit has lower THD and increased voltage gain clearly.
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