To realize the integration of renewable energy

energy storage device

and high-voltage DC bus

a high gain Boost-SEPIC three-port converter based on coupled inductors and voltage multipliers is proposed. A three-port converter is formed by embedding H-bridge structure which provides charge and discharge paths for the energy storage device in the Boost-SEPIC converter. The coupled inductor and voltage multiplier are introduced to further increase the voltage stress of the output port to obtain a high-gain Boost-SEPIC three-port converter. The working principle

the voltage gain

the voltage stress of the switching device

and the inductor current condition in the continuous conduction mode of the high-gain Boost-SEPIC three-port converter are analyzed. The power loss and control strategy of the proposed converter are discussed. The results show that the proposed converter has the advantages of high voltage gain

continuous input current

low voltage stress on switching devices

and high efficiency. Finally

a 200W experimental prototype is built to verify the theoretical analysis.