In view of the parallel output dual active bridge (DAB) DC-DC converter in the power electronic transformer (PET)

the influence of the front stage cascaded H-bridge (CHB) control strategy on the DAB is analyzed. A virtual power balance control (VPBC) method for DAB with equivalent input series output parallel (ISOP) and equivalent input independent output parallel (IIOP) is proposed

and the mechanism of the control strategy is also analyzed. Finally

the adopted VPBC scheme and input capacitor voltage balance control (VBC) scheme are verified and compared in a three cells experimental platform by using TMS320F28335+FPGA_6SLX45. The experimental results show that the proposed scheme can significantly improve the dynamic response of DAB DC-DC converter for the load and input voltage mutation based on the transmission power balance of each module. Meanwhile

the transient fluctuation of the transmission power in the converter can be effectively suppressed.