Rail transit traction power supply system, control method and system thereof and related components

Abstract

The invention discloses a rail transit traction power supply system which comprises a high-voltage alternating-current power supply bus, a plurality of bidirectional converters, a direct-current powersupply bus for supplying power to a train and a plurality of sets of in-station equipment. One end of each bidirectional converter is connected with the high-voltage alternating-current power supplybus, and the other end of each bidirectional converter is connected with the direct-current power supply bus; and each group of in-station equipment is connected with a high-voltage alternating-current power supply bus. The bidirectional converter is used for connecting the direct-current power supply bus and the alternating-current power supply bus, the magnitude and direction of power output onthe direct-current power supply bus and the alternating-current power supply bus are flexibly distributed, possible network voltage fluctuation is actively controlled and reduced, and meanwhile, voltage conversion, brake feedback, harmonic treatment and reactive compensation are achieved; therefore, the regenerative braking energy recovery efficiency and the traction power supply efficiency are improved, and the green, controllable, safe, efficient and intelligent operation of the whole power supply and distribution network is realized. The invention further correspondingly discloses a controlmethod and system of the rail transit traction power supply system and related assemblies.

Description

technical field [0001] The invention relates to the field of rail transit traction power supply, in particular to a rail transit traction power supply system and its control method, system and related components. Background technique [0002] At present, the power supply of urban rail transit at home and abroad usually uses DC1500V / 750V for power supply, and all use diode rectifier units to obtain power from 35kV or 10kV AC power grids. A traction substation usually includes two 12-pulse rectifiers to form a 24-pulse rectifier unit. DC traction network power supply. At the same time, in order to save energy and reduce emissions, an energy feedback device will be installed in the track line to feed back the braking energy of the train to the AC grid to achieve secondary utilization of energy. [0003] Due to the characteristics of uncontrolled rectification and pulsed energy consumption of the traction power supply system, there are a large number of low-order harmonics in t...

AI Technical Summary

Problems solved by technology

[0003] Due to the characteristics of uncontrolled rectification and pulsed energy consumption of the traction power supply system, there are a large number of low-order harmonics in the system and the power factor is not high. Additional harmonic control and reactive power compensation devices are required. The voltage fluctuation is large, and the proportion of line loss is high

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