Method for realizing electric auto-passing neutral section of train by utilizing power electronic switching device

Abstract

The invention relates to a method for realizing an electric auto-passing neutral section of a train by utilizing a power electronic switching device and belongs to the technical field of the manufacturing of the power electronic switching device. An existing modern power electronic technology, namely a high-power voltage current transducer control technology, is adopted to realize the complete equipment of power electronic switching device which is used as a 'phase-change switch for a ground auto-passing neutral section device', thereby optimizing an existing 'uninterrupted automatic electricphase-separating system for electrically dragged train', exactly realizing an uninterrupted automatic electric phase-separating function of an electrically dragged railway train and overcoming inherent defects of technical performance of an original system.

Description

technical field [0001] The invention belongs to the technical field of manufacturing power electronic conversion devices, that is, high-power voltage and current frequency converters and control technology. The application field belongs to the field of electric traction power supply for electrified railways. phase method. It is usually used in AC electrified railways that use the national industrial grid as an external power supply, and is suitable for new or rebuilt railway electrification projects and existing railway operation power supply facilities. Background technique [0002] Due to the particularity of the traction power supply mode and train operation mode of the railway system, there is usually a neutral isolation area of ​​about 200-900m every 30-60km as a separation between different electrical phases, which is the so-called "electrical phase separation" area or " "Neutral zone", the middle zone of this length needs at least 2-8 seconds even for a train passing...

AI Technical Summary

Problems solved by technology

Due to the limitations of today's equipment manufacturing technology, it is difficult to substantially improve the life and reliability of equipment such as high-current circuit breakers and switches. The system configuration can only be improved from the perspective of backup and redundancy. However, this partial optimization This method brings new problems of more complicated system structure. This kind of conversion between different power supplies that relies on multiple mechanical isolating switches (or circuit breakers) still requires extremely high time-difference switching operation coordination accuracy; in basic In principle, there are still inherent defects that cannot be overcome, that is, it will inevitably bring about the transient process of electric phase separation, short-term power loss, and operating overvoltage problems. Theory and experiments have proved that this principle itself cannot fundamentally eliminate this defect. At most, it is only possible to get a certain relief or improvement, but in any case, the actual magnitude of the operating overvoltage is still sufficient to double the rated operating voltage, thereby damaging the main insulation and equipment life of the electric traction train or EMU. own damage

[0005] Therefore, it is necessary to study the real uninterrupted power supply method of the new system, especially the neutral zone of the live electric split-phase system, and optimize the power supply scheme for the neutral zone of the electric split phase from the aspects of the switchgear principle and the switching principle. On the one hand, it eliminates the operational overvoltage caused by the combined switching of power supplies with different electrical phases in a very short period of time by multiple switches, and the difficulty of equipment manufacturing and high reliability requirements brought about by the application equipment requirements of multiple switches with extremely high time difference requirements, and fundamentally solves the existing The operational overvoltage and short-term power loss defects of the ground automatic over-phase separation system solution break through the technical bottleneck of popularizing and applying the ground automatic electrification over-phase separation system

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