Auxiliary converter for rail train and start control method thereof

Abstract

The invention provides an auxiliary converter for a rail train and a start control method thereof. The auxiliary converter comprises a sampling unit connected with a converter module and is used for acquiring current and voltage of the converter module; the converter module comprises a converter unit, and a pre-charge and output switch control unit connected between an alternating current bus andthe converter unit; the sampling unit, the converter unit and the pre-charge and output switch control unit are respectively in communication connection with a controller; an output contactor connected between an alternating current filter unit and the alternating current bus is arranged in the pre-charge and output switch control unit, and the pre-charge and output switch control unit can pre-charge the converter unit and controls the output contactor to be closed or disconnected after the auxiliary converter is started and before the auxiliary converter is connected to the alternating current bus. According to the auxiliary converter for the rail train provided by the invention, an impact current of a filter capacitor during the starting of the auxiliary converter can be effectively reduced, and grid-connected conflicts can be eliminated, so that the control logic of a central control device is simplified, and the safe and smooth grid connection of the auxiliary converter are realized.

Description

technical field [0001] The invention relates to the technical field of rail transit, in particular to an auxiliary converter for rail trains and a starting control method thereof. Background technique [0002] Traction auxiliary converters for rail vehicles provide sufficient electrical power to the individual electric motors to ensure electrical traction, braking and auxiliary supply of the rail vehicle. Auxiliary converters for rail vehicles such as figure 1 As shown, a rail vehicle is equipped with multiple auxiliary converters, and each auxiliary converter includes a converter module and a controller connected to the converter module. Each auxiliary converter is connected through a corresponding The controllers communicate with the central control device on the rail train respectively, so that the central control device on the rail train controls the opening of each auxiliary converter. [0003] In the prior art, the auxiliary converters used for rail trains are put in...

AI Technical Summary

Problems solved by technology

[0004] However, due to the structural limitations of the existing auxiliary converters, the auxiliary converters start directly when receiving the start signal, and when the first inverter starts, it needs to close the output contactor and then enter the slow-start mode. However, due to the inconsistency of the mechanical device characteristics of the contactors in the auxiliary converters, it is easy to cause the risk of grid-connection conflicts, which will cause the entire auxiliary converters in the rail vehicle to fail to work normally, and the driving safety of the rail train cannot be guaranteed.

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