**6. Conclusions**

This paper proposes a BDC topology with a multiplexed modulation strategy for high-power energy storage in bipolar DC microgrids. The parallel arms divide the input side current, which can effectively overcome the current difference caused by the inconsistent parasitic parameters of the parallel arms. The series arms divide the voltage of the high voltage side, which can effectively reduce the voltage stress of the switch and the flying capacitor. The bidirectional transient response is milliseconds, which ensures the dynamic performance and operating efficiency of the converter. The BDC has a strong fault tolerance ability, and the failure of any one of the arms does not affect the operation of other arms. The proposed BDC topology and its modulation strategy can effectively solve the issue of high-power energy storage in bipolar DC microgrids.

**Author Contributions:** P.L. designed the prototype and was responsible for writing the paper. C.Z., S.P. and L.Z. were responsible for guidance in the experiment and thesis writing process.

**Funding:** This research was supported by the National Nature Science Foundation of China under Grants 51477148 and the Science Foundation of Hebei University of Science and technology Grants PYB2019011. This research also received funding from EEEIC International, Poland.

**Conflicts of Interest:** The authors declare no potential conflict of interest.
