A traction converter

Abstract

The invention relates to a traction converter device, which comprises a pre-charging circuit, an integrated converter module and an isolation contactor, wherein the pre-charging circuit is connected with a traction winding of a traction transformer and used for charging a supporting capacitor in a DC circuit of the traction converter device; the integrated converter module is connected with the pre-charging circuit and used for performing AC-DC conversion and DC-AC conversion on alternating current transmitted by the pre-charging circuit to obtain direct current applicable to a traction motor;and the isolation contactor is arranged between an output end of the integrated converter module and a connection port of the traction motor and used for isolating the integrated converter module from the traction motor when the integrated converter module breaks down. The traction converter device is internally integrated with the isolation contactor which can isolate the traction converter device from a permanent magnet synchronous motor in the case that there is a fault in the traction converter device. The device adopts the integrated converter module which can enable the whole device tobe smaller in size, lighter in weight and more reliable in system.

Description

technical field [0001] The invention relates to the technical field of rail transit, in particular to a traction converter. Background technique [0002] In the 1980s, with the emergence of high-power power semiconductors that can be turned off and the application of microcomputer technology, the availability of squirrel-cage induction motors has greatly increased, making AC electric locomotives with their high power, wide speed control and Features such as simple maintenance quickly occupy the new "darling" of the rail transit industry. With the rapid development of the rail transit market, customers have continuously put forward higher requirements for the reliability and availability of AC electric locomotives, and have higher requirements for the weight and volume of the traction system. Compared with asynchronous motors, permanent magnet synchronous motors are small in size and light in weight, and have the advantages of high efficiency, large starting torque, and impr...

AI Technical Summary

Problems solved by technology

[0003] Compared with the three-phase asynchronous motor, due to the excitation characteristics of the permanent magnet synchronous motor, when the train is running at high speed, if the IGBT component of the traction converter has a fault such as short circuit, then if the permanent magnet synchronous traction motor is still in the power generation state, the change The converter module will be short-circuited, which will further expand the fault

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