Fuzzy logic based quasi Z-source cascaded multilevel inverter with energy storage for photovoltaic power generation system

The quasi-Z-source cascaded multilevel inverter (QZS-CMI) have the advantages of minimum switches, balanced dc-link voltage, voltage boost capability and save one-third modules compared to conventional voltage and current source inverter. This system combines the QZS-CMI and energy storage by adding an energy stored battery in each module to balance the fluctuations of PV power. The voltage boost/ inversion and energy storage are integrated in a single stage inverter by using Fuzzy Logic Controller (FLC). The proposed system can achieve the distributed maximum power point tracking for PV panels, balance the power between different modules and provide the preferred power to the grid with reduced harmonics. A detailed design method of controller parameters is included. And also the MATLAB simulation results is included.