Vienna Rectifier for DC Charging Pile

A three-phase three-level Vienna rectifier is proposed to improve the power factor and reduce harmonic content for DC charging pile. Based on current hysteresis comparison control strategy, voltage deviation of midpoint of dc-link capacitor is introduced into current reference, and voltage balance of midpoint of dc-link is realized by adjusting the dc offset of current reference. Finally, the simulation model of Vienna rectifier based on PSIM is established, and the feasibility of the control method is verified under the conditions of voltage and load stepping. Under the steady-state condition, the power factor at the grid side is greater than 0.99, and the current harmonic distortion rate is less than 3%.