Auxiliary backup power supply under emergency traction condition

Abstract

The invention proposes an auxiliary backup power supply under emergency traction conditions, including four parts: input pre-charging circuit, three-phase inverter circuit, LC filter circuit and output power distribution unit; the pre-charging circuit is used to The voltage precharges the DC‑LINK capacitor; the three-phase inverter circuit is used to convert the output of the precharge circuit from DC to AC; the LC filter circuit is used to suppress the high-order harmonics of the AC output of the three-phase inverter circuit, and the three The output filter of the phase inverter circuit is a smooth sine wave; the output power distribution unit is used for the power supply switching between BUI and external SIV, time-sharing start and the realization of system logic. The invention solves the problem of paralysis of the traction system under the failure of the auxiliary converter of the train, has small size, light weight, high output voltage steady-state precision, strong overload capacity and load impact resistance, and fast dynamic response.

Description

technical field [0001] The invention relates to rail transit technology, in particular to an auxiliary backup power supply under emergency traction conditions. Background technique [0002] The general urban rail transit subway traction system consists of traction converter, auxiliary converter, traction motor, braking and other parts. The traction converter drives the traction motor to realize the normal operation of the train, and the braking resistor consumes the motor during braking. The energy generated by the reverse rotation or the air compressor is used to provide air pressure for the air brake. At the same time, the auxiliary converter must provide the power supply for the traction converter, the braking resistor cooling fan and the air compressor 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 power supply of other vehicles will...

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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