High Voltage DC Urban Rail Transit Traction Power Supply System

Abstract

The high-voltage direct current urban rail transit traction power supply system described in the present invention converts the input voltage of the main substation into ±10kV or other voltage level direct current and distributes it to each traction substation, and directly connects the output positive voltage of the traction substation to the traction substation. The network and output zero voltage are connected to the running rail. If the negative voltage output by the direct pull station is connected to the return line, and the three-terminal voltage output by the DC AT in the DC autotransformer is respectively connected to the traction network, the running rail and the return line, a DC AT power supply is formed. system. The multi-functional DC transformer in the direct pull station can realize bidirectional flow of energy, so that all the DC capacitors on the high-voltage DC bus and traction network of the main substation, direct pull station and direct coupling station can become the energy when the train brakes buffer, thus solving the problem of train braking energy utilization at the source. In addition, the system is able to effectively reduce the track potential and stray currents.

Description

technical field [0001] The invention relates to the technical field of electrified rail transit and power electronic direct current conversion, in particular to a high-voltage direct current urban rail transit traction power supply system. Background technique [0002] With the development of power electronics technology, rail transit is becoming increasingly mature and developing rapidly. Among them, urban rail transit is widely used in major modern cities in the world due to its advantages of energy saving, land saving, large transportation volume, all-weather, low pollution, and high safety. As of the end of 2018, a total of 185 urban rail transit operating lines have been opened in 35 cities in mainland my country, with a total length of 5,761.4 kilometers. And it is expected that by the end of 2020, the total length of operating lines will exceed 6,000 kilometers. For urban rail transit, DC traction power supply system is mostly used, and relevant domestic standards, ...

AI Technical Summary

Problems solved by technology

The traction substation in the high-voltage DC urban rail transit traction power supply system includes multi-functional DC transformers, other switches and protection devices, etc., among which the multi-functional DC transformer can realize bidirectional energy flow, so the main substation and traction substation etc. All DC capacitors on the high-voltage DC bus and traction network of the field can be used as energy buffers for train braking, thus solving the problem of train braking energy utilization at the source

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