In this paper

a new type of static var generator device is designed

which compared with the traditional reactive power compensation device

such problems as low operating voltage

slow response speed and small compensation capacity are solved. The H-bridge cascade is determined as the topological structure of this paper

which suppresses largely the generation of harmonics.The static var generator（SVG）developed is subject to software and hardware actual set up

the integral performance of the set up system is adjusted and the experimental result is analyzed. It is shown by the experimental result that the static var generator developed complies with China national standard and industry requirement and the system can perform fast dynamic reactive power compensation to the power grid.