A rail transit vehicle main circuit suitable for multiple power supplies

Abstract

The invention discloses a rail vehicle main circuit suitable for power supplying of a plurality of power supplies. The rail vehicle main circuit comprises a rectifier / chopper unit, an inverter unit and a bidirectional DC / DC conversion unit. The output end of the rectifier / chopper unit is connected with a traction motor through the inverter unit. The input end of the rectifier / chopper unit is connected with DC power supplies with different standards or AC power supplies with different standards. The input end of the inverter unit is connected with an on-vehicle energy storage unit through the bidirectional DC / DC conversion unit. When the input end of the rectifier / chopper unit is connected with the AC power supply, the rectifier / chopper unit is in a four-quadrant rectification state. When the input end of the rectifier / chopper unit is connected with the DC power supply, the rectifier / chopper unit is in a bidirectional DC / DC chopping state. The rail vehicle main circuit according to the invention has advantages of simple structure, stable output power supply, high suitability for different power supplies, etc.

Description

technical field [0001] The invention mainly relates to the technical field of rail transit, in particular to a rail transit vehicle main circuit suitable for power supply by various power sources. Background technique [0002] The power supply system of my country's rail transit vehicles is different due to the trunk railway and urban rail transit. The trunk railway uses 25kV AC power supply, while the urban rail transit uses 1500V or 750V DC power supply. With the in-depth development of my country's three-dimensional transportation, the demand for rail transit interconnection is becoming stronger and stronger. The market needs a rail transit vehicle that can be applied to three power supply systems of AC25kV, DC1500V and DC750V at the same time. [0003] The current social energy supply continues to be tense, and the rail transit industry, which is a major energy consumer, has begun to vigorously develop energy-saving technologies. Rail transit vehicles equipped with on-b...

AI Technical Summary

Problems solved by technology

[0012] 1. The main circuit cannot work under the power supply of AC25kV, DC1500V, DC750V, and vehicle-mounted energy storage devices at the same time. The applicability of the power supply is not strong enough to fully meet the needs of the interconnection of rail transit lines

[0013] 2. The main circuit is equipped with a four-quadrant rectifier in the AC25kV power supply mode, which can basically stabilize the intermediate DC voltage and will not affect the output of the traction motor due to low voltage; but in the DC1500V power supply mode, the grid voltage and There is only a line filter between the intermediate voltages, and the intermediate voltage will fluctuate with the grid voltage. If the grid voltage is low, it will greatly affect the output of the traction motor

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