Rapid self-healing method of urban rail transit alternating current power supply system

Abstract

The invention discloses a rapid self-healing method for an urban rail transit AC power supply system, and the method comprises the steps: after a fault occurs, enabling an incoming and outgoing line switch protection device to act, and simultaneously sending a tripping command to a protection device at the opposite side of a looped network cable; firstly sending a tripping command to a switch by aprotection device receiving a ring network cable opposite side tripping command; after the switch is tripped off, sending a spare power automatic switching starting signal to the spare power automatic switching device in the station by the protection device receiving the ring network opposite side tripping signal, wherein the spare power automatic switching device can act when the automatic switching condition is met; and then switching on a bus tie switch, so that a lower-level transformer substation system at a fault point recovers quickly, and the alternating current power supply system continues to operate normally. According to the method, the backup automatic switch of the lower-level transformer substation is triggered to be started through the ring network opposite side tripping signal, so that the method has high self-adaptability, can adapt to different operation conditions of an alternating-current power supply system, and can complete system self-healing under different fault types.

Description

technical field [0001] The invention relates to the field of relay protection for an AC power supply system of urban rail transit, in particular to a rapid self-healing method for an AC power supply system of urban rail transit. Background technique [0002] The AC power supply system of urban rail transit provides the required electric energy for the normal operation of urban rail transit. Once the power supply is interrupted for a long time during the operation and service of urban rail transit, it will not only cause the paralysis of urban rail transit transportation, but also endanger the safety of passengers and property loss. Therefore, the rapid self-healing of the system after a fault can effectively reduce the impact range of the accident and reduce the losses caused by it. [0003] The AC power supply system of urban rail transit is composed of multiple power supply zones. Each power supply zone adopts a multi-substation ring structure with single-side power suppl...

AI Technical Summary

Problems solved by technology

According to the experience of some domestic lines, the time difference between the loss of voltage and automatic switching between adjacent substations is usually more than 2s, so for the power supply partition with a large number of ring strings, the closer the substation to the end of the power supply partition, the self-healing delay the longer

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