Ground neutral section passing control method, control device and neutral section passing device

Abstract

The invention discloses a ground neutral section passing control method that comprises the following steps: S01, detecting voltages at two ends of a one-phase electronic switch which is firstly conducted in a ground neutral section passing device in real time; and S02, when the voltage is equal to the turn-off voltage of the electronic switch, turning on the other phase of electronic switch for commutation. The invention further discloses a ground neutral section passing control device which comprises a voltage detection unit used for detecting the voltage at the two ends of one electronic switch in the ground neutral section passing device in real time, and a control unit used for switching on another electronic switch for commutation when the voltage is equal to the turn-off voltage of the electronic switch. The invention further discloses a ground neutral section passing device that comprises a switch assembly composed of two electronic switches and the ground neutral section passing control device, and the switch assembly is used for connecting the neutral section with two-phase power supply arms respectively. The control method, the control device and the neutral section passing device have the advantages of high control precision, short commutation dead zone time and the like.

Description

technical field [0001] The present invention mainly relates to the field of phase separation technology, in particular to a ground phase separation control method, a control device and a phase separation device. Background technique [0002] At present, my country's railway phase separation is mainly based on vehicle phase separation. With the increase of train speed, the power failure process of vehicle phase separation will bring speed loss to the train, and the restriction of speed increase and stable operation will become more and more serious. In addition, heavy-haul railways have heavy loads, and the train transportation load caused by speed loss is limited. The promotion and application of power electronics technology in railway power supply has become more and more practical. There are many types of existing ground phase separation devices, and there are more and more researches and applications on the phase separation technology based on power electronic devices. H...

AI Technical Summary

Problems solved by technology

[0011] The above patents all detect the current zero-crossing point in the start-up commutation; however, because the current is affected by the working conditions of the locomotive, when the locomotive current is relatively small, there may be multiple zero-crossing of the current, and the detection accuracy of the existing detection current circuit is low. Unable to accurately detect small currents

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