Self-healing power supply system for urban rail transit

Abstract

The invention discloses a self-healing power supply system for urban rail transit, and the system comprises substations distributed along the rail transit, connecting cables among the substations, a peer-to-peer communication network and a self-healing method; each substation consists of a corresponding electrical primary subsystem and electrical secondary equipment; the electrical primary subsystem is used for realizing power supply connection of electric equipment in a station and is matched with electrical secondary equipment to realize switching of different operating conditions, wherein the different operating conditions comprise a normal operating condition, an overhauling condition and a fault condition; and the electrical secondary equipment acquires the electrical characteristic parameters of the power supply system through the communication network, automatically judges the operation state of the power supply system according to the parameter change, and controls the corresponding electrical primary sub-equipment to automatically execute fault isolation or switching operation according to the acquired power loss reason of the system and a corresponding self-healing method; therefore, the parallel / cooperative work of multiple devices is realized, the self-healing performance of the system is improved, and the rail transit service level is improved.

Description

technical field [0001] The invention belongs to the technical field of urban rail transit power supply systems, and more specifically relates to a self-healing power supply system for urban rail transit. Background technique [0002] Urban rail transit power supply system generally includes external power supply, main substation (or power switching station), medium voltage power supply network, traction substation, traction network, step-down substation, power lighting distribution system, power monitoring system , Stray current corrosion protection system and power supply workshop, etc. Among them, when centralized power supply is used, a main substation needs to be set up. Its function is to convert the 110kV power supply of the urban power grid into a medium-voltage 35kV power supply through the main transformer, and supply power for the rail transit traction substation and step-down substation. When decentralized power supply is used, a power switching station needs to ...

AI Technical Summary

Problems solved by technology

As mentioned above, since the measurement and control devices near the circuit breaker cannot obtain the overall information of the system, the backup automatic switching at all levels of the urban rail transit AC power supply system generally adopts the method of time-gradient coordination to realize the selectivity of the standby automatic switching. With the increase in the number of power substations, the time delay of the terminal substation's backup and automatic switch-on action will be significantly longer, and in severe cases it can reach more than 10s

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