Railway traction power-obtaining power supply for through line

Abstract

The invention provides a railway traction power-obtaining power supply for a through line. The power supply comprises a high-voltage switch cabinet, a transformer and a medium-voltage loop which are arranged on a current path in sequence, wherein a power conversion unit is connected with the medium-voltage loop through the coupling transformer; and a monitoring and control unit is connected with the high-voltage switch cabinet, the transformer, the medium-voltage loop and the power conversion unit through a signal cable. The power supply is an apparatus for obtaining power from a contact network and supplying the purified high-quality three-phase 10kV power supply to the through line; namely, the input power supply is obtained from the 27.5kV (or 55kV) alternating current from the electrified railway traction contact network; then the alternating current is subjected to voltage reduction by the transformer, and then is dynamically adjusted and filtered by a voltage source connected with a 10kV loop in series so as to obtain the stable power supply for the through line; and in addition, the three-phase unbalance, voltage fluctuations, and voltage harmonics caused by railway train operations can be eliminated, so that the voltage quality on the output side can be ensured.

Description

technical field [0001] The invention belongs to the field of electric energy conversion and control of power electronics, and relates to a series-type voltage quality active purification device, in particular to a kind of power-taking from the catenary, which is passed through after undergoing voltage transformation, series voltage stabilization, filtering, and high-low voltage coupling treatment. A device that provides three-phase 10kV high-quality medium-voltage power supply. Background technique [0002] The through-line power supply is used to provide working power to the second and third-level loads along the railway line, and at the same time as a backup power supply for the railway self-closing line. The existing power supply methods for the railway through-line power supply mainly include: 1) Two 10kV power supplies are provided by the local power grid , respectively as a self-closing line and a through-line power supply. This method has good power supply quality, s...

AI Technical Summary

Problems solved by technology

This power supply method has low construction cost and low risk of power failure, but affected by railway traffic, the 10kV through-line power supply has defects of three-phase imbalance, large voltage harmonics, and large voltage fluctuation range, and the power supply quality does not meet GB / T12325 "Power Quality According to the provisions of "Power Supply Voltage Deviation", it cannot be used as a backup power supply for self-closing lines

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