A new High Step-up Three-Port DC-DC Structure for Hybrid PV/Battery Energy Systems

In this paper, a new high step-up three-port structure using one PV panel and a battery as a storage element is proposed. In this proposed structure, three power switches, one single inductor and one coupled inductor are used. The gain of voltage for the presented topology is higher than conventional three-port converters which is referred in this paper. Using one unidirectional and one bidirectional inputs develop the proposed topology as a compatible candidate for hybrid power system. Controlling state of charge (SOC) for battery, and regulating the voltage of output can be achieved by adjusting duty cycles of switches. Also, the capability of supplying the load and either charging or discharging of the storage element is provided by input source. In addition, the capability of supplying the load without PV source is provided by battery. The analysis of steady-state condition in the proposed converter is discussed completely. Finally, the validity of the presented structure is verified by simulation results.