A fast voltage balance curve of duty cycle distribution for cascaded rectifier stage based on two dimensional modulation

A novel two dimensional modulation strategy for cascaded rectifier stage in a novel generation power converter without line-frequency transformer is introduced by this paper. A fast voltage balance curve of duty cycle distribution is proposed. Experiment results indicate that this proposed strategy can balance the DC-link voltages of each module for cascaded rectifier stage much better, improve system anti-disturbance ability, as well as realize the unity power factor in rectifier stage.