Traction converter circuit

Abstract

The invention discloses a traction converter circuit. The traction converter circuit comprises an auxiliary conversion loop and multiple completely independent main conversion loops; each main conversion loop comprises a pre-charging module, a four-quadrant rectification module, an intermediate direct-current loop and an inversion module which are connected in sequence, wherein the pre-charging module is used for performing on-off control on the pre-charging process and normal working process of the traction converter circuit, the four-quadrant rectification module sets input alternating current into direct current and inputs the direct current into the intermediate direct-current loop, and the intermediate direct-current loop comprises a support capacitor for voltage stabilization; and the auxiliary conversion loop comprises a multi-station isolation switch and an auxiliary inversion module which are connected with each other, wherein the multi-station isolation switch is in switchingconnection with the intermediate direct-current loop of any main current conversion loop so as to take electricity for the auxiliary inversion module. According to the traction converter, a full-independent shaft control type and main and auxiliary integrated structure is adopted, the usability and reliability of the traction converter are effectively improved, and the size and weight of equipment are reduced.

Description

technical field [0001] The present application relates to the technical field of locomotive traction transmission, in particular to a traction converter circuit. Background technique [0002] With the steady growth of the national economy, my country's transportation industry, especially rail transportation, is also booming and busier. [0003] The traction converter is the core component of the locomotive transmission system, and its performance has a huge impact on the operating efficiency. Through the traction converter circuit, the electric energy of the power supply can be rectified and inverted successively to generate alternating current of appropriate frequency and size for use by the locomotive. Generally, the traction converter circuit in a locomotive includes a main converter circuit for supplying power to the traction motor and an auxiliary converter circuit for supplying power to auxiliary loads and the like. In the existing locomotive traction converters, the...

AI Technical Summary

Problems solved by technology

In the existing locomotive traction converters, the structure of multiple main converter circuits sharing the intermediate DC circuit is adopted, so that the mutual coupling effects between the main converter circuits, once the power module in a certain main converter circuit fails, the Power modules in other main converter circuits need to be blocked as well, reducing availability and affecting the normal operation of the locomotive

Moreover, the main and auxiliary separation structure is generally adopted in the prior art, that is, the auxiliary converter circuit and the main converter circuit are powered separately, which undoubtedly increases the number of traction transformers used for power supply, and makes the entire traction converter equipment Bigger in size and weight

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