Through type non-phase separation balanced power supply electrified railroad traction system

Abstract

The invention relates to a run-through type non-split-phase balanced power supply electrified railway traction system, belonging to the technical field of railway electric traction power supply. The system comprises traction transformators, all sections of traction networks and current equalizers, wherein, each section of traction power supply network is provided with an energy distribution regulating machine which mainly consists of a main controller, a driver, an electronic power switch bridgearm, a support capacitance arm, three electric current sensors, three voltage transducers and three reactors; A phase of the output end of each traction transformator is connected with the traction power supply network, B phase thereof is connected with the energy distribution regulating machines, and C phase thereof is connected with a steel rail; the main controller of each of the energy distribution regulating machine is connected with a control center. The invention has the advantages that split-phase power supply is changed into non-split-phase power supply, and great run-through of the traction contact network can be realized, so that safe, high speed and high-efficiency running of train can be guaranteed.

Description

technical field [0001] The invention relates to a locomotive traction power supply system of an electrified railway, and belongs to the technical field of railway electric traction power supply. Background technique [0002] As we all know, the power grid provides three-phase AC power, while the electrified railway traction power supply system changes it into two-phase power supply in order to reduce costs. Most of the power supply methods of railway traction systems at home and abroad adopt the YNd11 power supply method and the improved method (Scott) based on it, and they all belong to the out-of-phase power supply (separate phase power supply) method as a whole. (See p.126-131 in the book "High-Speed ​​Railway Electrification Engineering" published by Southwest Jiaotong University Press and p.10-15 in the book "Analysis of Traction Power Supply System"). Due to historical and technical reasons, this split-phase power supply method makes its traction power supply network ...

AI Technical Summary

Problems solved by technology

Due to the large number of electrical split phase points and the number of electrical segments, this method results in a small distance between substations, large traction impedance, and frequent operations of raising and lowering (breaking and closing) of the pantograph, which shortens the electrical life and reduces the The locomotive operates reliably. In addition, this out-of-phase power supply method cannot provide three-phase balanced power supply. It has a large negative sequence current, and the harmonic content of the power grid is large. Although certain compensation measures are adopted, the energy utilization rate is still low. , which is in serious conflict with the development goals of train safety, heavy load, high speed and high efficiency

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