This paper proposes an energy storage system that combines multi-energy storage devices such as a LiB and an EDLC for the power-grid. The proposed control method divides the amplitude of the compensation power reference into the LiB and the EDLC to improve the converter efficiency. A 10-kW prototype system was designed and implemented to validate the proposed architecture and system performance. The experimental results demonstrated that the proposed control method effectively compensated for the power fluctuation from the renewable energy system. The performed simulation analysis confirmed that the proposed system reduced the losses in comparison with the conventional control method.
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