Auxiliary power supply system and electric locomotive

Abstract

The invention provides an auxiliary power supply system and an electric locomotive. The auxiliary power supply system comprises an auxiliary current transformer assembly and a filtering circuit assembly. The auxiliary current transformer assembly comprises an auxiliary control unit and an auxiliary power unit which are mutually connected. The auxiliary control unit is used for generating control signals of the auxiliary power unit according to set algorithm to control the auxiliary power unit to output pulse signals with set width. The filtering circuit assembly comprises a transformer, a capacitor and an electro-magnetic interference (EMI) filter which are sequentially connected. The auxiliary power unit is connected with the transformer. The filtering circuit assembly is used for filtering harmonic wave in the pulse signals. The power supply system can output sine-wave voltage signals to provide a stable voltage source for load, reduce electromagnetic interference of harmonic wave in the signals on peripheral communication devices and electronic devices and reduce effect of the harmonic wave on the load.

Description

technical field [0001] The invention relates to power structure technology, in particular to an auxiliary power system and an electric locomotive. Background technique [0002] The power supply system of an electric locomotive includes a main power system and an auxiliary power system. The main power system is used to provide a voltage source for the traction equipment in the electric locomotive. Equipment usually refers to various fans, oil pumps, air compressors, air conditioners, etc. installed in electric locomotives. [0003] Since the auxiliary power supply system mainly includes an inverter circuit, and the AC power waveform output by the inverter circuit will generate harmonics, the harmonics will cause serious interference to the communication equipment and electronic equipment in the electric locomotive, and the auxiliary power supply When the power output from the system is supplied to the motor in the locomotive, the harmonic voltage and current will increase th...

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Problems solved by technology

[0003] Since the auxiliary power supply system mainly includes an inverter circuit, and the AC power waveform output by the inverter circuit will generate harmonics, the harmonics will cause serious interference to the communication equipment and electronic equipment in the electric locomotive, and the auxiliary power supply When the power output from the system is supplied to the motor in the locomotive, the harmonic voltage and current will increase the iron loss and copper loss of the motor, increase the temperature of the motor, reduce the efficiency, generate noise, and even cause damage to the motor

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