Test method for safety protection of high-voltage DC bus in traction converter

Abstract

The invention provides a traction converter high voltage direct current bus safety protection test method. An environment is detected and established. A hard-wired interface and a network interface are used to detect a traction converter, the state of a traction converter power control module and the state of an auxiliary converter contactor. Protection test is carried out. Based on normal state detection, a discharge module is used for the discharge of an intermediate circuit to ensure the accuracy of the protection test. The whole vehicle is used to close the main break for the first time. The converter is pre-charged for the first time for the protection test, and at the moment the auxiliary converter contactor is closed. A pre-charge contactor disconnection command is issued to check the voltage value of an intermediate voltage transformer. If the voltage value exceeds a limit value within specified time, the protection test is considered qualified, otherwise the protection test failed. The intermediate direct current link bus in the converter is failed. According to the invention, the protection test method is used to carry out fault pre-judgement on the traction converter high voltage direct current bus; the main contactor of the converter is not closed; whether the direct current bus is faulty is detected when list warehouse-out is carried out; and the safety of a high voltage system is improved.

Description

technical field [0001] The invention belongs to the technical field of rail vehicles, and in particular relates to a testing method for the safety protection of a high-voltage DC bus bar of a traction converter of a rail vehicle. Background technique [0002] As the power output source of the EMU, the traction converter’s safe and stable work is related to the normal operation of the EMU. If the DC high-voltage bus inside the traction converter fails, it will cause problems with the intermediate voltage, which will affect the entire traction The contribution of the converter to the whole vehicle, even the entire traction converter needs to be cut off when the fault is serious, so the safety protection test of the high-voltage DC bus is necessary. [0003] The premise of judging the existing technical solutions is that the traction converter on the vehicle has been connected to high voltage, the main contactor of the traction converter is in the closed state, and the voltage ...

AI Technical Summary

Problems solved by technology

[0004] The detection of the existing technical scheme is based on the fact that the main contactor of the traction converter is already in the closed state, and the intermediate DC bus has been connected to high voltage. If there is a fault in the detection at this time, firstly, the high voltage has been connected, and the fault will cause damage to the components Second, the traction system can only be removed passively. If the train is in the state of online operation at this time, the train will remove the converter. During the entire online operation, the train can only use 75% traction Capacity operation, unable to carry out equipment maintenance, will affect the efficiency of train operation

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