Three Phase Grid-Connected Photovoltaic System using Three Level H-bridge Inverter under Partial Shading

This paper deals with three-phase three level H bridge inverter for a photovoltaic power plant interconnected to grid under variable irradiation conditions, that features a maximum power point tracking scheme based on the Perturb and Observe (P&O) method. With the aid of the sinusoidal pulse-width modulation control technique, proportional-integral controllers, and Park transformation, the inverter control system managed to convert photovoltaic power to ac power, stabilize the output voltage and current of a grid connected photovoltaic system. The photovoltaic module has been modelled, the maximum power point tracking algorithm and a three level inverter has been validated by simulation analysis. The simulation results show the detailed model of this grid-connected multi-level inverter and the control strategy used in the photovoltaic generation system