According to the single phase-to-ground fault in the medium-voltage distribution networks

a two-phase current injection method based on the cascaded H-bridge static var generator(SVG)is studied. When the distribution network is operating normally

the SVG works in the reactive compensation mode. When single-phase-to-ground fault occurs

the neutral point of SVG is grounded and the arc suppression currents are injected into the distribution network from the other two non-grounded phases bridge of SVG

so that the fault current at the grounded point is reduced

and the traditional arc suppression coil is replaced by reusing the existing SVG equipment. This paper discusses the relationship between current injection method of SVG arc suppression and the voltage balance control of SVG DC side and the working mode of two-phase current injection of SVG arc suppression and the design method of arc suppression controller are analyzed in detail. Then

its operation mode and the controller design process are discussed in detail. A 10 kV simulation model based on MATLAB/Simulink and an experimental prototype with 380 V three-phase four-cascade low-voltage SVG are constructed for simulation and experimental verification. The simulation and experimental results verify the correctness and feasibility of the proposed scheme.