For the parallel system of hydrogen power supply and pantograph power supply, this paper proposes a unified power control method for the DC/DC boost converter system, which can complete the seamlessly transfer from the gridconnected mode to the standalone mode without changing a control strategy, and vice versa. There is no need to detect the interconnection switch to identify whether it is grid-connected or standalone. It can meet the power reference value required by the load in different working modes, and can flexibly coordinate the output each power supply. And by analyzing the relationship between the droop coefficient and the dc bus voltage and power, the selection principle of the best droop coefficient is given. Finally, the experiments based on a 1MW DC/DC boost converter system are carried out to verify the proposed unified power control method.

DC/DC Boost converter;seamlessly swtiching;unified power control;grid-connected mode;;standalone mode