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Switched Capacitor Cascaded Bidirectional DC-DC Converter Suitable for Energy Storage System

This paper presents a non-isolated bidirectional dc-dc converter which is applicable in energy storage system. This type of converter comprises two sets of boost converters, cascaded with each other. At the high voltage side, a switched-capacitor cell is configured. On the converter’s low voltage side, two independent inductors are replaced with one coupled inductor. Because the structure of the converter is relatively simple, its driving method and control method are both easy. This paper analyzes in detail the converter’s working principles in the steady-state. Finally, a simulation model was built to validate the correctness of the design and analyses.