Three-Phase Static Var Generator Based on Z-Source Network

Abstract

The utility model provides a three-phase static var generator based on a Z source network. The three-phase static var generator comprises the Z source network, a main inversion circuit and a detection control module, wherein output ends of the Z source network are connected to a direct current side of the main inversion circuit; output ends of the main inversion circuit are connected to a three-phase power grid in parallel; and the detection control module is used for detecting voltages and currents of the three-phase power grid, the output ends of the main inversion circuit, and the Z source network, controlling the on-off state of a switch device of the main inversion circuit through driving signals, and further realizing the dynamic reactive compensation of the three-phase power grid. Unique X-type combination of small inductors and capacitors of the Z source network is used to replace the topological structure on the direct current side of an existing SVG, the defect that the SVG device is liable to be influenced by the insufficient voltage on the direct current side is overcome, a dead-zone circuit is effectively eliminated, and the output noises caused by the dead time are avoided, so that the SVG provided by the utility model is lower in cost, the reactive power compensation range is wider, the compensation effect is better, and the working reliability of the SVG is substantially improved.