A novel medium voltage DC power distribution scheme is proposed. In order to save the system volume

the structure of modular multilevel converter(MMC)and diode rectifier is used. Compared with the traditional 50 Hz control algorithm

the size of the converter can be greatly reduced by setting the output AC voltage and current base frequency to 1 kHz. As the fundamental frequency increases

the modulation algorithm must be simplified. An MMC square wave modulation strategy is proposed

which can save the controller resources compared with the traditional MMC modulation algorithm. In order to test the whole system rated operating conditions

a resistance microcirculation control scheme is proposed. The solution can achieve the internal power cycle

and the grid only provides the power consumption of the resistance and the system power dissipation

which can greatly reduce the pressure of the grid.