Study of Z-Source Inverter Impedance Networks using 2ω Analysis for Photovoltaic Applications

摘要

In a single-phase photovoltaic grid connected system, the inherent second harmonic power flow results in large size impedance network of the Z-Source PV inverter. Minimization of the impedance network is a challenging area of research. So, a detailed mathematical approach based on 2ω ripple analysis is proposed. This paper depicts the 2ω modeling of Z-source inverter to obtain reduced component ratings of the impedance network. The analysis has been extended for Trans Quasi Z network and Embedded Z network and the component ratings are compared with Z network. Simulation has been carried out in MATLAB/Simulink for single phase Z-source PV inverter with impedance network designed using 2ω ripple analysis and the results are verified.