DC (Direct Current)-based deicing and SVG (Static Var Generator) device capable of realizing stepless voltage regulation

The invention discloses a DC (Direct Current)-based deicing and SVG (Static Var Generator) device capable of realizing stepless voltage regulation. The device comprises a plurality of converter units which are connected on a secondary output winding end of a transformer; each conveyor unit comprises a low-voltage breaker, a selective switch, a fully-controlled rectifying unit and an uncontrollable rectifying unit, wherein the input end of each fully-controlled rectifying unit is connected with an output end of the corresponding low-voltage breaker after being connected with the input end of the corresponding uncontrollable rectifying unit in parallel through a first contact of the corresponding selective switch, the output ends of each fully-controlled rectifying unit and each uncontrollable rectifying unit are in parallel connected as a DC output of the converter unit, and a second contact of the selective switch of a first convertor unit is connected with a wire on an overhead line; the DC cathode output end of each convertor unit is sequentially and serially connected with the output end of the second contact of the selective switch of the next convertor unit, and the DC cathode output end of the last conveyor unit is connected with another wire on the overhead line. According to the device provided by the invention, the DC/DC chopping stepless voltage regulation can be realized, and an SVG function can be realized.