ZD-FGSVG MV STATCOM using IGBT as the core power modules which can quickly and continuously provide capacitive or inductive reactive power, achieve constant reactive power, constant voltage and constant power factor control through the assessment point, and ensure the power grid is running stable, high efficiency and high quality. In the power distribution network, the small capacity FGSVG can significantly improve the power quality (improve the powerfactor, overcome phase imbalance, eliminate voltage flicker and fluctuation, restraining ?harmonic), if it is installed in some special loads (such as electric arc furnace).