For achieving efficient application of three-phase bidirectional isolated DC/DC converter in highvoltage access low-voltage output energy storage system

a kind of novel control strategy is designed. The adoption of wye-delta connection of the isolation transformer in the three-phase DC/DC converter can reduce the voltage stress on the high-voltage side and the current stress on the low-voltage side. The new scheme uses switching frequency to control and adjust the output voltage of the DC/DC converter

and after it is higher than the switching frequency point

a kind phase-shift algorithm of resonant circuit is used to reduce the switching frequency range with the specific power. At the same time

the zero-voltage switching conditions for all MOSFET of the converter in the entire power range are analyzed in depth. Functional tests are performed based on the prototype of 2 kW DC/DC converter principle

and the effect of the new control strategy is verified by the experimental result.