Method for quickly switching back-up power supply network of urban rail transit to recover power supply

Abstract

The invention provides a method for quickly switching in a backup power supply network of urban rail transit to restore power supply, which comprises the following steps of: S1, continuously judging whether external power introduction of a normal power supply looped network is completely powered off or not, if so, skipping to step S2, and if not, skipping to step S2; s2, simultaneously performing the following operations: starting and completing synchronization of the emergency diesel generator system, simultaneously closing all circuit breakers on the emergency power supply ring network segment A, simultaneously closing all circuit breakers on the emergency power supply ring network segment B, and if the operations are successful, skipping to the step S3; s3, closing a circuit breaker of the boost substation; s4, judging whether the bus on the equipment side in the substation of each station has voltage or not, and skipping to the step S5 for the station with voltage; and S5, closing the circuit breaker of the electric equipment of the station substation, and recovering power supply. On the premise that safety and reliability are guaranteed, the switching-in time is shortened to 29 s from conventional 89 s, and the requirement that emergency switching-in of the backup power supply network is completed within 30 s is met.

Description

technical field [0001] The invention belongs to the technical field of urban rail transit, and in particular relates to a method for rapidly cutting in and restoring power supply of an urban rail transit backup power supply network. Background technique [0002] As one of the important guarantee systems for the operation of urban rail transit, the safety and reliability of the power supply system are of paramount importance. Therefore, the domestic urban rail transit power supply system generally adopts the ring network power supply method to increase redundancy, and two independent power sources are introduced from the main substation or the power system substation at both ends of the ring network. When a single point of failure occurs in the incoming power supply or the ring network line, the incoming power switching device is used to switch to another power supply, or the relay protection device is used to urgently isolate the fault point on the ring network, so as to ens...

AI Technical Summary

Problems solved by technology

Therefore, using the domestic conventional method of restoring power supply cannot meet the emergency cut-in time requirement of 30s for the backup power supply network

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