说明：  systematic method for deriving three-port converters (TPCs) from the full-bridge converter (FBC) is proposed in this paper, which splits the two switching legs of the FBC into two switching cells with different sources and allows a DC bias current in the transformer. By using this systematic method, a novel full-bridge three-port converter (FB-TPC) is developed for renewable power system applications with merits of simple topologies and control, reduced number of devices and single stage power conversion between any