With the rapid development of power electronic technology and reactive power compensation industry, more and more new products and technologies have been applied to the field of power quality management. SVG (static var generator), as a combination product of power electronic technology and reactive power compensation industry applications, represents a new direction in the development of reactive power compensation technology at the present stage. SVG is the most advanced product in the reactive power compensation industry at present, which can output capacitance or inductive reactive power in a fast and continuous manner and effectively provide the system power factor, reduce system loss and restrain harmonic pollution, etc., achieve proper control of voltage and reactive power and guarantee the stable, safe and efficient operation of the power supply system.