Grid-connected PV system with a seven-level inverter

Abstract

Solar energy is becoming increasingly popular day by day, so are grid-connected solar power generation systems. This paper proposes a solar power generation system with a seven-level inverter. A DC-DC power converter is used to boost the output voltage of the solar panel, which is controlled using MPPT. The capacitors of the capacitor selection circuit are charged with multiple relationships by the DC-DC power converter. These capacitors serve as input voltage sources for the seven level inverter. The output of the seven level inverter is fed into the utility grid such that the output current is sinusoidal and in phase with grid voltage. The inverter contains only six power electronic switches which is less complex when compared with conventional multi-level inverters.