Energy-fed traction power supply device

The utility model discloses an energy-fed traction power supply device, which comprises a multiple transformer, and at least two four-quadrant converter modules. The energy-fed traction power supply device and a diode rectifier traction unit are disposed in parallel, a primary side of the multiple transformer is connected with an alternating-current medium voltage power network through a high-voltage switchgear, each winding on a low voltage side of the multiple transformer is connected with an alternating current side of the corresponding four-quadrant converter module, the direct current sides of the four-quadrant converter modules are connected with a direct current side disconnector and then connected in parallel, and the the direct current sides of the four-quadrant converter modules are then connected with a direct current bus through a direct current switch gear and a cathode cabinet. The energy-fed traction power supply device is capable of operating in a traction mode, a feedback mode or a SVG (scalable vector graphics) mode differently. The energy-fed traction power supply device is compatible with an existing traction power supply system and proper in cost while meeting the requirement of the power network on compatibility, can solve the technical problems of regenerative braking energy feedback and stable network voltage traction, and has the static reactive power compensation capacity.