Alternating current and direct current mixed traction power supply system with ice melting function

Abstract

The invention relates to an alternating current and direct current mixed traction power supply system with an ice melting function. The alternating current and direct current mixed traction power supply system comprises an alternating current power supply assembly, a direct current power supply assembly and a discharging coil, wherein the alternating current power supply assembly is used for realizing alternating current power supply, a traction transformer of the alternating current power supply assembly is connected into a traction power supply net through a first circuit breaker, the traction transformer outputs alternating current after the voltage reduction and is connected with the traction net through an alternating current feeder switch, the direct current power supply assembly is used for realizing direct current power supply, a rectifying transformer of the direct current power supply assembly is connected into a traction power supply net through a second circuit breaker, the rectifying transformer is subjected to voltage reduction and outputs direct current after being rectified via a rectifier, one path is connected with the traction net through the direct current feeder switch, the other path is connected with the traction net through a double-electrode high-voltage isolation switch, in addition, a high-voltage isolation switch used for realizing short circuit on a traction net uplink and a traction net downlink is arranged at the tail end of a section post line, and the traction net uplink and the traction net downlink form a ice melting loop; the discharging coil is arranged at the positive bus end of the output side of the direct current feeder switch and is provided with a high-voltage switch. The alternating current and direct current mixed traction power supply system has the advantages that the principles are simple, the function integrality is high, the operation is safe and reliable, and the like.

Description

technical field [0001] The invention mainly relates to the field of locomotive power supply systems, in particular to an AC / DC hybrid traction power supply system and a power supply method with the function of melting ice. Background technique [0002] Since the implementation of my country's electrified railway, it has effectively promoted the development of the railway system. Most of the existing power supply systems of my country's railways use AC power supply, that is, the power frequency 110kV (or 220kV) is converted to power frequency 27.5kV through the traction transformer, and then supplied to the traction network for locomotives through the feeder switch. The Shaoshan series electric locomotives and CRH series EMUs currently in use in my country all use this AC power supply method. With the rapid development of urban subways and intercity light rail construction, electric traction is being more widely used in the field of urban rail transit due to its high efficie...

AI Technical Summary

Problems solved by technology

At present, there have been a large number of literature and application projects for the ice melting of traction lines or transmission lines. The ice melting of electrified traction networks is generally equipped with a set of fixed or mobile ice melting equipment separately, using independent high-power rectifiers or voltage Devices such as source converters provide power to melt ice, the structure is very complicated and the cost is high

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