A control device, system and method for train pantograph-catenary offline crossing

Abstract

The invention discloses a crossing control device, system and method for train pantograph-catenary disconnection. The device comprises a pantograph-catenary disconnection detecting unit, a rectification control unit and an inverter control unit. The pantograph-catenary disconnection detecting unit is used for detecting the pantograph-catenary disconnection state of a train; the rectification control unit is used for controlling a rectifying module to realize stable direct voltage of a middle DC circuit when the train is in normal operating conditions; the rectification control unit is used forcontrolling the rectifying module to realize stable primary voltage of a traction transformer when the train is in pantograph-catenary disconnection conditions; the inverter control unit is used forcontrolling an inverter module to realize the consistency of output torque of a traction motor and the given torque when the train is in normal operating conditions; the inverter control unit is usedfor controlling the inverter module to realize the stable direct voltage of the middle DC circuit when the train is in pantograph-catenary disconnection conditions. The crossing control device, system, andmethod disclosed by the invention can solve the technical problems that transformer primary overcurrent fault or four-quadrant AC side overcurrent fault as well as DC voltage shortage or auxiliary transformer shutdown fault in a traction system can be easily caused in pantograph-catenary disconnection, in particular to arc-free pantograph-catenary disconnection.

Description

technical field [0001] The invention relates to the technical field of rail transit, in particular to a pantograph-catenary off-line crossing control device, system and method. Background technique [0002] With the development of high-power converter technology, electric locomotives or EMUs generally adopt the AC-DC-AC drive traction system. The train AC drive traction system is mainly composed of pantograph, traction transformer, four-quadrant rectifier, intermediate DC circuit, inverter and traction motor. The train traction system obtains or feeds back electric energy through the contact between the pantograph and the catenary, which is the basic condition for the continuous normal operation of the traction system. Electric locomotives or EMUs running on operating lines may be affected by various factors such as power supply network conditions, rail surface conditions, and weather conditions, which may cause pantograph-catenary offline phenomena. The pantograph-catenar...

AI Technical Summary

Problems solved by technology

[0006] (1) The pantograph-catenary offline state leads to a large deviation between the primary side voltage on the pantograph and the grid voltage on the power supply network. The phase deviation from the real phase of the power grid and other factors can easily cause overcurrent faults on the primary side of the transformer or overcurrent faults on the four-quadrant AC side of the traction system

[0007] (2) When the arc disappears and the pantograph-catenary is offline, the pantograph cannot obtain energy from the catenary or feed back energy to the catenary. If the control unit does not perform any processing (referring to no shutdown or switching control), it is easy to The rapid drop of DC voltage can easily lead to DC undervoltage faults, and the rapid rise of DC voltage in braking conditions can easily lead to DC overvoltage faults, and the abnormal DC voltage can cause auxiliary transformers to shut down, affecting the loads of many fans, air conditioners and other loads on the train normal operation

The detection method of prior art 3 increases the cross-line current and the corresponding current sensor detection method, and it does not involve the pantograph-catenary off-line converter control method

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