Electrified railroad through power supply system without split phase

Abstract

The invention discloses an electrified railroad through power supply system without split phase. The electrified railroad through power supply system is characterized in that a traction transformer in a traction substation is a three-phase-two-phase balancing transformer, the three phases of the primary side of the three-phase-two-phase balancing transformer of each traction transformer are correspondingly connected with the three phases of the same public power grid, a power flow controller is connected between the two output phases of the three-phase-two-phase balancing transformer, and one of the two output phases supplies power to a locomotive; each traction transformer uses the same phase to supply power to the locomotive; and the power flow controller consists of a first single-phase isolating transformer, a first voltage source inverter, a direct-current coupling capacitor, a second voltage source inverter and a second single-phase isolating transformer which are connected in turn. The system can implement railroad full-line connection in the same power supply network, and has no split phase through power supply so as to simplify the engineering design and save the investment and maintenance expense; and the system ensures the high-speed, stable and safe operation of the train, and is particularly suitable for high-speed and heavy haul railways.

Description

technical field [0001] The invention relates to an electrified railway power supply system. Background technique [0002] In the electrified railway power supply system, in order to ensure the balance of the public power system and reduce negative sequence and reactive power, the traction transformer in the traction substation must adopt three-phase incoming lines and take turns to commutate the output, and the corresponding traction transformer mostly adopts a three-phase-two-phase structure . When a three-phase-two-phase balanced traction transformer is used in the traction substation, the two output phases of the transformer, α-phase and β-phase, supply power to the upstream and downstream power supply arms respectively, which is conducive to realizing the balance of power supply and reducing the impact of negative sequence . The conversion from α-phase to β-phase in the substation is realized by the electric phase separation link. At the same time, if the phases of ad...

AI Technical Summary

Problems solved by technology

[0005] 1. Most of the over-phase operations have a power-off process. The locomotives in the neutral section rely on inertial operation, so that the train loses power in a short time and the speed decreases. On long ramps and outbound sections, it affects Larger; especially for high-speed, heavy-duty transport locomotives, it may even cause the train to stop abnormally

[0006] 2. Under high-speed operating conditions, although the automatic over-current phase-splitting device does not require manual intervention, its accuracy and reliability are not high due to high working voltage and frequent switching operations, which also seriously affect the safe operation of the locomotive.

[0007] In short, the existence of excessive phase separation in the existing electrified railway power supply system directly affects the safe and high-speed operation of electrified railways; it is also the bottleneck of the development of high-speed and heavy-duty transportation, and it is an urgent problem to be solved

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