Low voltage direct current(LVDC)distribution network can reduce the power capacity of each bus section by sectionalizing buses

so it is possible to provide DC power in a wide range. Due to the diversity of distribution network load and the randomness of electricity consumption

the voltage of DC buses fluctuate frequently

and the energy storage devices should be arranged in a sensitive load area to improve the quality and the reliability of power supply. For this purpose

a topology of a triple-phase DC/DC converter is firstly chosen and implemented to increase the power capacity and power supply time of the energy storage devices in the situation of bus failures. Meanwhile

the constant voltage control based on the carrier phase shifting is adopted to reduce the voltage deviations and current ripples

thus improving the power quality. Secondly

to cope with the power fluctuations of distribution networks and to shorten the transient response time

the dynamic response process of the storage converters output current is analyzed in detail

and the small signal model is built. Thirdly

based on the above analysis

a feedforward control strategy is proposed by introducing the voltage deviation into the inner current loop

and the strategy's drawbacks are analyzed and improved. Finally

an experimental verification is implemented.