Development of 3kW Hybrid ESS with Function of Emergency Power Supply-Authors 양석현(Seok-Hyun Yang) ; 김민재(Min-Jae Kim) ; 최세완(Se-Wan Choi) ; 조준석(Jun-Seok Cho)

Abstract

Development of 3kW Hybrid ESS with Function of Emergency Power Supply Authors 양석현(Seok-Hyun Yang) ; 김민재(Min-Jae Kim) ; 최세완(Se-Wan Choi) ; 조준석(Jun-Seok Cho

 This paper proposes a high-efficiency 3-kW hybrid ESS with emergency power supply. The proposed system enables efficient use of power from photovoltaic (PV) cells and energy storage system (ESS). The proposed system can operate as an uninterruptible power supply (UPS) when grid fault occurs, providing seamless transfer from grid-connected mode to stand-alone mode. The LLC converter for PV achieves ZVS turn-on of switches and ZCS turn-off of diodes, and the isolated bidirectional DC-DC converter for ESS achieves ZCS turn-off regardless of load condition, resulting in high efficiency. The efficiency and performance of the proposed hybrid ESS has been verified by a 3-kW prototype.

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