A current conversion device for a flexible automatic phase separation system on the ground of an electrified railway

Abstract

The invention provides a current conversion apparatus of an electrified railway ground surface flexibility automatic passing over of neutral section system. The current conversion apparatus comprisesan <alpha>-phase side single-phase multi-winding rectifying transformer T1, a <beta>-phase side single-phase multi-winding rectifying transformer T2, an inversion transformer T3 and a three-port four-quadrant current converter BLQ; the three-port four-quadrant current converter BLQ performs alternating current-direct current-alternating current conversion on the accessed <alpha>-phase and <beta>-phase traction bus power supplies, then outputs a path of single-phase power supply through a high-voltage winding of the inversion transformer T3, then is connected with the secondary-side high voltage of the <alpha>-phase and <beta>-phase side single-phase multi-winding rectifying transformers in series, and then performs voltage synthesis to supply power for an electric split-phase neutral section N of a contact network. By taking the advanced power electronic current conversion apparatus and special transformers as the core components, continuous power supply for the electric split-phase neutral section of the contact network can be realized, so that a train can perform passing over of neutral section without power down, and electric arc, overvoltage, overcurrent impact and the like arenot generated.

Description

technical field [0001] The invention relates to the technical field of catenary traction power supply for electrified railways, and more specifically, to a converter device for a ground flexible automatic phase separation system for electrified railways. Background technique [0002] my country's electrified railway traction network adopts phase-separated and segmented single-phase power frequency AC power supply. Every 30-60km, there is an isolation area of ​​about 200-900m in neutral electrical phase separation, which is called electrical separation. In addition to affecting the comfort and total running time of the catenary, and reducing the railway transportation capacity, the catenary phase separation also brings at least 80 kV operating overvoltage, which may cause damage or failure of the high-voltage equipment of the train. At the same time, Frequent excessive phase separation can easily lead to driver fatigue. Therefore, catenary phase separation has always been a hi...

AI Technical Summary

Problems solved by technology

[0007] In order to solve the problem that there will still be no electricity dead zone in the neutral section in the phase commutation process existing in the existing over-phase system, and then bring overvoltage and overcurrent impact to the train, the invention provides a flexible automatic over-phase on the electrified railway ground system converter

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