V/V wire-based electrical railway same-phase power supply system

Abstract

The invention discloses a V / V wire-based electrical railway same-phase power supply system, and relates to the technical field of power supply of an AC electrical railway. The same-phase power supplysystem comprises a three-phase high-voltage bus, a traction transformer, a three-phase compensation transformer, a three-phase compensation device and a coordination control unit, wherein a primary side of the traction transformer is connected with a A phase and a B phase of the three-phase high-voltage bus, a first primary side of the three-phase compensation transformer is connected with a secondary side of the traction transformer, a second primary side of the three-phase compensation transformer is connected with a B phase and a C phase of the three-phase high-voltage bus, a primary side of the three-phase compensation device is connected with a secondary side of the three-phase compensation transformer, and the coordination control unit is connected with the secondary side of the three-phase compensation device. By the same-phase power supply system, same-phase power supply of the whole railway can be achieved, an electric split phase is eliminated, the optimal technology economyof electrical railway same-phase power supply also is effectively achieved, and meanwhile, the problem of electric energy quality caused by an electrical railway electric locomotive load taking a negative sequence of a three-phase system as main can be solved.

Description

technical field [0001] The invention relates to the field of AC electrified railway power supply, in particular to a V / V connection-based electrified railway in-phase power supply system. Background technique [0002] The electrified railway in my country generally adopts single-phase power frequency AC system. In order to make the single-phase traction load as balanced as possible in the three-phase power system, the electrified railway often adopts the scheme of alternating phase sequence and split-phase partition power supply. The adjacent power supply intervals at the phase separation partition form a phase separation insulator, which is called electrical phase separation or phase separation. In order to prevent electric locomotives from burning catenary suspension components due to electric split phases due to electric phase separation, and even causing phase-to-phase short circuits and other accidents, as the train speed continues to increase, when the driver cannot ma...

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Problems solved by technology

[0003] High-speed and heavy-duty railways have widely used high-power AC-DC-AC electric locomotives or EMUs based on full-control devices such as IGBTs and IGCTs. The core is the traction converter with multiple sets of four-quadrant PWM control and multiple control. , in actual operation, the harmonic content is small, and the power factor is close to 1, but the traction power of AC-DC-AC electric locomotives or EMUs is large. For example, the rated power of single-vehicle high-speed EMUs operating in large formations can reach 25MW (equivalent to ordinary speed railways. 5 trains), the increasingly serious power quality problems caused by these large-scale high-power single-phase loads on the three-phase grid, mainly caused by three-phase voltage unbalance (negative sequence), cannot but be taken seriously

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