In-phase power supply system for electric railway based on SCOTT wiring

Abstract

The invention discloses an in-phase power supply system for an electric railway based on SCOTT wiring, and relates to the technical field of power supply for an alternating current electric railway. The in-phase power supply system comprises a three-phase high voltage bus, an SCOTT balancing transformer, a compensation transformer, a three-phase compensation device and a coordination control unit;the primary side of the SCOTT balancing transformer is connected with an A phase, a B phase and a C phase of the three-phase high voltage bus, the secondary side of the SCOTT balancing transformer isseparately connected with the compensation transformer and the three-phase compensation device; the compensation transformer is connected with the three-phase compensation device, and the coordination control unit is connected with the secondary side of the three-phase compensation device. Therefore, in-phase power supply of the whole railway line is achieved, electric phase separation is cancelled, the technical economy optimization of in-phase power supply of the electric railway is effectively achieved, and the electric energy quality problem taking the negative sequence of a three-phase system as the principal thing is caused by load of electric locomotives of the electric railway and can be solved.

Description

technical field [0001] The invention relates to the field of AC electrified railway power supply, in particular to an electrified railway in-phase power supply system based on SCOTT wiring. 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 ...

AI Technical Summary

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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