Implementation of SEPIC/Zeta Three-Port Bidirectional DC-DC Converter for Renewable Energy Applications

In this paper an efficient topology of (Single Ended Primary Inductor Converter) SEPIC/Zeta converter is proposed to interface renewable energy sources and the load. The proposed converter is obtained by the integration of the bidirectional converter and the full-bridge converter. As the output voltage of the proposed converter is not reversed this topology provides remarkable advantages than the other topologies when battery is used as the backup. The output voltage can be used to power the LED light which needs the input voltage not more than 50 V. The control action was implemented by using conventional controller to maintain power mismatch in the system by tracking maximum power and by regulating the battery voltage and the output voltage. The working principles of the proposed converter are also analyzed in detail. The performances of the system are also analyzed under the conditions of different insolation and load current.