A Comparative Analysis of PWM Methods of Z-Source Inverters Used for Photovoltaic System

摘要

The photovoltaic cell produces pollution less electricity. It requires almost no maintenance and has long lifespan. Nowadays, the photovoltaic is one of the most promising markets in the world because of these advantages. This paper demonstrates the dynamic model of single-stage three-phase impedance source inverter or Z-source inverter connected to grid. Here ZSI connected to PV is analyzed and designed. As the output of the PV array is very low, in order to commercialize and utilize this, the output voltage must be increased. So to boost up the voltage, Z-source inverter (ZSI) is used instead of VSI or CSI. Different pulse width modulation (PWM) techniques are used to provide pulses for PV connected Z-source converter (ZSI). After this, the final model is simulated using MATLAB/SIMULINK, and THD related to different output waveforms are analyzed for different parameters used.