Abstract: In order to improve the power quality of shearer power supply system, the static var generator (SVG) is selected as the compensation scheme of electric traction shearer reactive power compensation and harmonic suppression. The traditional PI control SVG is difficult to deal with the load mutation caused by the different coal seam hardness of the electric haulage shearer. The linear active disturbance rejection control (LADRC) strategy is proposed. The linear extended state observer (LESO) is used to observe and compensate the variable coupling terms and external disturbances in the SVG model,and the current loop linear active disturbance rejection controller and voltage loop linear active disturbance rejection controller of SVG are designed. The simulation results show that the grid-side voltage and current are in the same phase after the designed SVG compensation device is put into the shearer, which reduces the harmonic content of the grid-side current of the shearer and improves the power quality of the underground power supply system. Compared with the traditional PI controller, the LADRC controller effectively improves the compensation performance of the SVG compensation system.