Split-phase-free through power supply device for electrified railway

The utility model discloses a split-phase-free through power supply device for an electrified railway. A traction transformer in a traction substation is a three phase-two phase balancing transformer; primary side three phases of the three phase-two phase balancing transformer in each traction substation are correspondingly connected with three phases of the same public power grid; a tidal current controller is connected between two output phases of the three phase-two phase balancing transformer, and one phase of the two output phases supplies power for a locomotive; each traction substation uses the same phase to supply power for the locomotive; and the tidal current controller consists of a single-phase isolating transformer I, a voltage source inverter I, a DC coupling capacitor, a voltage source inverter II and a single-phase isolating transformer II which are sequentially connected. The device has the advantages that the whole railway communication in the same power supply network and the split-phase-free through power supply can be realized, the construction design is simplified, the investment and maintenance costs are saved, the high-speed, stable and safe running of the train is ensured, and the device is particularly suitable for high-speed, heavy-load railway.