Abstract：In order to meet the requirement for common-mode leakage current in photovoltaic (PV) generation systems, a neutral point clamped non-isolated PV inverter with a freewheeling switch is proposed. A freewheeling switch is added in AC side of the full bridge inverter in this topology. That will improve the non-isolated PV inverter conversion efficiency because the freewheeling switch makes the output of the solar panels off the grid. On the other hand, common-mode voltage remains constant on power processing and freewheeling stage owing to the neutral point clamped circuit. The operational principle and controlling strategy were analyzed in this paper. It was proved that common-mode performance of the proposed topology was good by Saber simulation software. The proposed topology and strategy has been verified in a prototype rated at 300W.