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1. A three-rail power supply control system for electrified railway trains, comprising a running rail along an electrified railway, a power supply rail laid parallel to the running rail, an AC-DC-AC variable-frequency and variable-voltage device and a rectifying device arranged on the ground, and an on-board current collector, a traction motor and auxiliary electric equipment arranged on a train, and the power supply rail comprises a first power supply rail, a second power supply rail and a third power supply rail; the first power supply rail, the second power supply rail and the running rail form a three-phase AC power supply circuit which is powered by the AC-DC-AC variable-frequency and variable-voltage device arranged on the ground; the running rail is grounded; the third power supply rail and the running rails form a DC power supply circuit which is powered by the rectifying device arranged on the ground; the on-board current collector comprises a first current collector, a second current collector, a third current collector and a fourth current collector; tail ends of the first current collector, the second current collector and the fourth current collector are connected to a three-phase terminal of the traction motor of the train through cables, and front ends of the first current collector, the second current collector and the fourth current collector are in contact with the first power supply rail, the second power supply rail and the running rail respectively for power receiving; the tail end of the third current collector is connected to a positive pole of the auxiliary electric equipment of the train through a cable, the front end of the third current collector is in contact with the third power supply rail for power receiving, and the tail end of the fourth current collector is connected to a negative pole of the auxiliary electric equipment of the train through a cable; the AC-DC-AC variable-frequency and variable-voltage device supplies power to the traction motor of the train through the first power supply rail and the first current collector, the second power supply rail and the second current collector, and the running rail and the fourth current collector, and the train is controlled to start, stop and operate by controlling the frequency and voltage of the AC-DC-AC variable-frequency and variable-voltage device to vary; and the rectifying device supplies power to the auxiliary electric equipment of the train through the third power supply rail and the third current collector, and the running rail and the fourth current collector.
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