A Power Sharing Control Scheme with Fast-Dynamic Response for Input-Series Output-Parallel DAB dc-dc Converter

With some advantages such as electric isolation, high efficiency and fast dynamic response, the input-series output-parallel (ISOP) DAB dc-dc converter has been regarded as one of the most promising candidates for connecting the medium voltage terminal and the low voltage terminal. In this paper, the average model of the ISOP DAB dc-dc converter is presented firstly, which can be employed to analyze the power distributions of this modular topology clearly. Then, the inherent coupling between the adjustment of input voltages for different power sharing performance and the adjustment of output voltages for fast-dynamic response is discussed. Moreover, for the ISOP DAB dc-dc converter system, a power sharing control scheme with fast-dynamic response is proposed for ensuring the power sharing ability and the fast-dynamic performance. Compared with existing methods, this proposed scheme can also significantly reduce the coupling between the power sharing control and the output voltage regulation. Finally, experiment results are provided to verify the effectiveness of the proposed power sharing control with fast-dynamic response for the ISOP DAB dc-dc converter system.