Abstract:With the continuous development of industry, the demand for electric energy will become larger and larger. The utilization rate of electric energy directly affects the power supply effciency of the power grid. In order to improve the transmission quality of electric energy in the power system, it is necessary to improve the power factor and reduce the reactive power, and SVG is the best scheme in the field of reactive power compensation at present, compared with the traditional condenser, capacitor reactor compensation and SVC compensation device mainly represented by TCR, the basic working principle and control method of SVG, compares the performance with traditional capacitor compensator and SVC system, and introduces the routine maintenance method of SVG are mainly introduced in this paper.