1.College of Electrical Engineering and Automation Anhui University Hefei 230601 China; 2.Anhui Provincial Collaborative Innovation Center for Industrial Energy Saving and Power Quality Control Anhui University Hefei 230601 China; 3.Research Center for Power Quality Engineering of the Ministry of Education Anhui UniversityHefei 230601 China
Abstract：A high-efficiency non-isolated single-phase grid-connected inverter topology using metal oxide semiconductor field effect transistor (MOSFET) as the switch and the corresponding control strategy are presented in this paper.This topology can eliminate the high frequency fluctuation of the common mode voltage, and thus effectively restrain the leakage current.A novel current freewheel path is investigated, which is only through the MOSFET instead of the body diode with high on-state loss.The conduction losses of the whole devices are then reduced, and the reverse recovery losses of the diodes are completely eliminated.Therefore, the efficiency of the grid-connected inverter is improved.In addition, the losses analysis and the closed-loop control strategy are described.The simulation and experimental results are provided to verify the effectiveness of the proposed topology and control strategy.
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2016, Vol. 31 
