Auxiliary standby power supply under emergency traction working condition

Abstract

The invention provides an auxiliary standby power supply under an emergency traction working condition. The auxiliary standby power supply comprises an input pre-charging circuit, a three-phase inverter circuit, an LC filter circuit and an output power distribution unit. The pre-charging circuit is used for pre-charging a DC-LINK capacitor according to the input voltage and the output voltage of the pre-charging circuit; the three-phase inverter circuit is used for converting the output of the pre-charging circuit from direct current to alternating current; the LC filter circuit is used for suppressing higher harmonics output by the alternating current of the three-phase inverter circuit and filtering the output of the three-phase inverter circuit into smooth sine waves; and the output power distribution unit is used for power supply switching between a BUI and an external SIV, time-sharing starting and implementation of system logic. The problem that a traction system breaks down under the condition that the train auxiliary converter breaks down is solved, the size is small, the weight is light, the output voltage steady-state precision is high, the overload capacity and the load impact resistance capacity are high, and the dynamic response is fast.

Description

technical field [0001] The invention relates to rail transit technology, in particular to an auxiliary backup power supply under emergency traction working conditions. Background technique [0002] General urban rail transit subway traction system consists of traction converter, auxiliary converter, traction motor, brake and other parts. The traction converter drives the traction motor to realize the normal operation of the train, and the braking resistor consumes the braking motor. The energy generated by the reversal or the air compressor is used to provide air pressure for the air brake. At the same time, the auxiliary converter must provide power supply for the traction converter, the braking resistor cooling fan and the air compressor, so as to ensure that the traction converter and the The normal heat dissipation of the braking resistor and the normal operation of the air compressor. When one auxiliary fails, the auxiliary of other vehicles will provide extended power...

AI Technical Summary

Problems solved by technology

In order to ensure flexible marshalling, the input high-voltage bus and output AC bus of each vehicle are not connected, and the extended power supply cannot be realized when the vehicle is running. In this case, when the auxiliary fault occurs, the whole vehicle has no AC 380V, including the cooling fan of the traction converter. Therefore, the traction converter cannot work at the same time, and the whole vehicle has no redundant emergency plan. When the auxiliary converter fails, the whole vehicle is paralyzed and can only be towed away by a trailer, which affects the normal operation of the line.

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