Abstract: In view of the power quality problems caused by the massive access of non-linear loads in the power supply system of coal mines, and the defects of high cost and large size of the centralized power quality regulation devices widely used at present, this paper proposes a control method based on the parallel connection of VIENNA type rectifiers to realize static reactive power compensation in order to improve the power quality of the power supply system. This method effectively suppresses the input current over-zero distortion problem of VIENNA rectifiers in compensating reactive power, which in turn greatly improves the capability of such rectifiers in power quality management. Finally, the feasibility and effectiveness of the proposed method are verified by simulation.