Non phase separation type traction power supply equipment for railway locomotive

Abstract

A non-split-phase type traction power supply device used for rail vehicles belongs to technical field of railway electric traction power supply. The device comprises a traction transformator and 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, wherein, the driver is connected between a control terminal of the electronic power switch bridgearm and the main controller, the electric current sensors and the voltage transducers are respectively connected between the main controller and A phase, B phase and C phase of an output end of the traction transformator, and the reactors are connected between the center of the bridgearm and the A phase, the B phase and the C phase of an output end of the traction transformator. The invention has the advantages that split-phase power supply is changed into non-split-phase power supply, great run-through of the traction contact network can be realized, and power phase position exchange for power supply again caused by frequent power failure can be avoided, so that safe, high speed and high-efficiency running of train can be guaranteed.

Description

technical field [0001] The invention relates to a railway locomotive traction power supply device. The invention belongs to the technical field of railway electric traction power supply. Background technique [0002] As we all know, power plants provide three-phase AC power, while electrified railway traction power supply systems use two-phase power supply to reduce costs, and use segmented and different-phase power supply methods, that is, phase-separated power supply, to balance the three-phase. 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"). In this split-phase power...

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Problems solved by technology

In this way, due to the large number of electric split phase points and electric segment numbers, the catenary for traction power supply is divided into multiple segments, resulting in large traction impedance, small distance between traction substations, and pantograph raising and lowering (breaking, closing) ) Frequent operation, frequent power-off and starting will cause the impact current to reach five to seven times, and sometimes the impact current can even be as high as ten times, which will easily cause equipment damage and affect the improvement of the running speed of the locomotive

This reduces the reliability of locomotive operation. In addition, this out-of-phase power supply method cannot provide three-phase balanced power supply. The negative sequence current value and the harmonic content of the grid are relatively large. Although certain compensation measures are adopted, the energy utilization rate is still low. low, which is in serious conflict with the development goals of train safety, heavy load, high speed and high efficiency

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