FGSVG (Windusn) Static Synchronous Compensator, also known as medium voltage Static Var Generator(SVG) is an active dynamic reactive and harmonic compensation device.

FGSVG Statcom, different from impedance compensation (injecting or absorbing reactive power by capacitor and reactor) theory of traditional SVC, is based on voltage source converter, whose theory is equivalent to static synchronous condenser but whose performance is better than that of condenser and SVC. Especially, its operation range is wide, and its reactive compensation under low voltage is far greater than that of SVC.