The shunt structure of full bridge sub module based on the inductance charge can control directly the grid connected current waveform. With the development of element and superconducting technology

this kind of modular current converter has a good prospect in the field of energy charge.However

the inductor of each sub model has problem of current balancing. In view of this problem

a new PD-PWM carrier bias distribution strategy is proposed in this paper to solve above problem effectively. The operating principle of the proposed scheme is described in detail and the current balancing result of the proposed control strategy is simulated and verified.