Grid connected Photovoltaic System Based on SPUC9 Inverter

This paper describes a grid connected photovoltaic system while using single phase multilevel inverter, the chosen topology is Split Packed-U-Cells inverter (SPUC), this application proved that the SPUC inverter can be used in the single phase grid connected applications generally and in the renewable energy applications particularly. It is characterized by the fact that it gives nine levels with only seven switches and two capacitors as it is able to generate sinusoidal AC current with a total harmonic distortion that meets the standards of the injection on the grid without using filters. A Pulse-Width Modulation (PWM) control technique is developed to balance capacitors in open loop condition. After the production of electrical energy by the PV array; a maximum power point tracking (MPPT) algorithm is performed to generate the maximum power to the grid. The proposed system was verified by simulation in MATLAB/Simulink to prove the efficiency of the proposed system.