Z-source inverter based Photovoltaic power generation system

This paper presents a high performance, Z-source inverter topology for grid connected PV systems and also Synchronized Pulse-Width Modulation technique in single and three phase PWM inverter for Photovoltaic power generation system. Z-source inverter has buck-boost feature, which is possible because of additional shoot through state introduced in zero state of the conventional pulse width modulated inverter and provides desired output ac voltage. The two independent control variables, the shoot-through duty ratio and the modulation index are used to control the proposed system in order to provide the required voltage and power. Simulation of single and three phase system is carried out using MATLAB/SIMULINK package and the results are presented for Z-source inverter.