Abstract
In order to resolve the problems of low efficiency and poor stability of traditional renewable energy systems, a three-port DC-DC converter for photovoltaic (PV) power systems and its control method are proposed in this paper. Firstly, the operating principles of the three-port DC-DC converter are analyzed in detail, and then, its topology are described. The proposed converter features simple topology, thus leading to high efficiency. Furthermore, the control method for the converter has been proposed for realizing constant voltage closed-loop control and maximum power point tracking (MPPT). Its operation can be transited mode automatically according to the photovoltaic power. Finally, the experimental data are given to verify the high efficiency and the feasibility of the converter.
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