Auxiliary power supply system of urban rail vehicle

Abstract

The invention relates to an auxiliary power supply system of an urban rail vehicle. The auxiliary power supply system comprises a pantograph and a main traction inverter, and further comprises one or more auxiliary power supply devices. The pantograph transmits the current of a contact network to the main traction inverter and the auxiliary power supply devices. The auxiliary power supply devices output a direct-current power supply, and the output ends of the auxiliary power supply devices are connected with electricity loads. Some electricity loads are provided with inverters, or the input ends of some electricity loads are connected with an inverter power supply. The input ends of the inverters and the input end of the inverter power supply are connected with the output ends of the auxiliary power supply devices. According to the auxiliary power supply system of the urban rail vehicle, alternating current auxiliary power supplying of existing urban rail vehicles such as a metro and a light rail is converted into direct current auxiliary power supplying, and the direct current of an electric device is converted into the needed alternating current through the inverters or in the mode that the inverter power supply is connected to the input end of the electric device, so that the weight of the power supply device is greatly reduced, the whole vehicle weight is reduced, light weight of the metro and light rail vehicles is achieved, meanwhile, the device cost can be reduced, and the purposes of energy conservation and environment protection are achieved.

Description

technical field [0001] The invention relates to a power supply system installed on urban rail vehicles such as subways and light rails, and belongs to the technical field of urban rail vehicle power supply. Background technique [0002] At present, the auxiliary power supply system of urban rail transit vehicles such as subways and light rails in my country is to install one or more sets of auxiliary power supply (SIV), which inverts the catenary network voltage power supply from DC 1500V or 750V power supply to 380V 3 Phase 4-wire AC power supply, providing AC 3-phase 380V and AC single-phase 220V power for subsequent electrical equipment. [0003] Because the output and input of the power supply need to be electrically isolated, the isolation transformer is large in size, heavy in weight, and low in efficiency, and the subsequent electrical equipment is an ordinary three-phase asynchronous motor or a high-power electric heater, such as an air conditioning unit, an air compr...

AI Technical Summary

Problems solved by technology

[0003] Because the output and input of the power supply need to be electrically isolated, the isolation transformer is large in size, heavy in weight, and low in efficiency, and the subsequent electrical equipment is an ordinary three-phase asynchronous motor or a high-power electric heater, such as an air conditioning unit, an air compressor, and a cooling fan. , electric heaters, etc., the load starting current is large, and the power supply needs to reserve a large power capacity to resist the load’s starting inrush current, which also causes the power supply to be bulky and heavy

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