AC-DC-AC traction transformation device

The utility model discloses an AC-DC-AC traction transmission and transformation device with a structure that: A three-phase transformer is connected with a public high-voltage power grid, a single-phase transformer connected with a railway traction load, a three-phase rectifying inverter, a DC accumulator and a single-phase rectifying inverter sequently connected between the three-phase transformer and the single-phase transformer. The device may bring in phase the output of adjacent transformer stations of the railway, let the output of adjacent transformer stations be the same phase and communicated without phase splitting; stable frequency and stable voltage of section power supply voltage of all traction transformer stations ensure of high-speed and heavy-haul running of vehicles; the power supply system of the railway traction load obtains power from the public power grid and is connected with interference isolated, which minimizes the impact of the railway traction load on the public power grid quality because of power obtaining in the sectional single-phase way.