Single Phase Packed-U-Cell Five Level Solar Inverter With Dual Operation Using Fuzzy Logic Controller

Packed-U-Cell inverters can be used for low and medium power applications such as solar PV systems. In this topology less number of switches is used and yields low THD which makes it best suitable. In this paper a modified algorithm for self-balancing of capacitor voltage for five level Packed-U-Cell solar inverter is proposed. In this method capacitor voltage is reduced to half of the source voltage, from redundant states from all possible switching states. The switching scheme proposed is very simpler compared to other techniques and also a close loop control of grid connected configuration using fuzzy logic controller with grid current and voltage feedback is proposed. MATLAB Simulink model of stand-alone and grid connected configuration is developed.