A Comparative Study of Cascaded Z-Source and Quasi Z-Source Multilevel Inverter for Photovoltaic applications

In this paper, a comparative study of five level cascaded H-bridge Z-Source inverter and quasi Z-Source inverter is proposed. Both the topologies employ impedance network between the PV source and inverter circuitry to achieve voltage boost and inversion operation in a single stage. The double carrier PWM technique is applied for both the topologies since it has several advantages over the conventional PWM techniques and performance parameters are calculated. The simulation of the above mentioned circuits have been performed in MATLAB/Simulink and the results are verified.