High-power permanent-magnet direct-drive freight locomotive traction converter

Abstract

The invention discloses a high-power permanent magnet direct-drive freight locomotive traction converter, and relates to the field of locomotive traction converters. The converter comprises two groups of independent traction main loops, wherein each group of traction main loops comprises a pre-charging loop, a four-quadrant power module, a four-quadrant chopping power module, an independent intermediate direct-current circuit, a traction inversion power module and a three-pole isolation contactor; the electrical principles and structures of the two traction main loops are completely the same. Each intermediate direct-current circuit comprises an energy storage circuit and a measurement and protection circuit; each energy storage circuit is used for stabilizing the voltage of an intermediate loop, each measurement and protection circuit is composed of a grounding measurement circuit, an intermediate voltage sensor and a voltage detection board, and a three-pole isolation contactor is arranged between the traction inversion power module and a permanent magnet synchronous motor. And each three-pole isolation contactor is connected with a three-phase traction inverter INV2 and a permanent magnet synchronous motor through copper bars. The problem that a traction converter of a high-power freight electric locomotive cannot be directly applied to a permanent magnet direct-drive electric transmission system is solved.

Description

technical field [0001] The invention relates to the field of traction converters for locomotives, in particular to a traction converter for high-power permanent magnet direct-drive freight locomotives. Background technique [0002] At present, most of the high-power freight electric locomotives adopt asynchronous AC transmission system. The transmission control of the asynchronous electric transmission system is carried out through the gearbox, which is limited by the mechanical devices of each component of the transmission system, and the improvement of transmission efficiency is limited. In recent years, green, safety, and energy saving have become the key development direction of rail transit vehicle equipment. Compared with the traditional asynchronous motor electric drive system, the permanent magnet direct drive electric drive system replaces the gearbox by using the coupling direct drive wheel set. The transmission mode eliminates the transmission loss caused by the g...

AI Technical Summary

Problems solved by technology

[0003] In order to solve the problem that the traction converter of the existing high-power freight electric locomotive cannot directly apply the permanent magnet direct drive electric transmission system, the present invention provides a high-power permanent magnet direct drive freight locomotive traction converter

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