(1. School of Electrical Engineering, Southeast University, Nanjing 210096, China; 2. Jiangsu Provincial Key Laboratory of Smart Grid Technology & Equipment, Southeast University, Nanjing 210096, China; 3. China Electric Power Research Institute(Nanjing), Nanjing 210003, China)

Photovoltaic power generation accessing the direct current(DC)grid is an important development orientation of the photovoltaic power. A scheme for the DC grid-connected photovoltaic power generation system with a novel capacitor voltage balancing control strategy is proposed by focusing on analysis of the input power ratio feedforward. Then, with the PLECS software, a simulation model of seven modules is built with the effectiveness and feasibility of the proposed control strategy verified by simulation results. Finally, a hardware platform containing three modules is set up to show the proposed control strategy is simple to control, easy to implement, highly reliable, and without additional sensors. This work is supported by National Natural Science Foundation of China(No. 51307024), Fundamental Research Funds for the Central Universities(No. 2242016K41005)and State Grid Corporation of China(No. DG71-15-039).