A current protection method for a series multi-stage distribution network based on a GOOSE mechanism

Abstract

The invention discloses a current protection method for a series multi-stage distribution network based on a GOOSE mechanism, longitudinal differential protection is configured at cable inlet and outlet positions of each distribution room as main protection, and overcurrent protection is configured as backup protection, overcurrent protection is configured at the feeder position in each distribution room, the fault section can be judged accurately and quickly and a fault is removed quickly, thus realizing the selectivity and rapidity of the protection function, which can effectively solve theproblems of enlarging the blackout range, affecting the fault search and delaying the fault treatment after the protection device does not act selectively after the current distribution network fault.The protection device in the same distribution room adopts optical fiber communication network to exchange information with GOOSE message mechanism, and the GOOSE signals transmitted can be divided into three types: GOOSE blocking current protection signal, GOOSE opening current protection signal and GOOSE opening failure protection signal. The communication mode replaces the traditional hard-wired communication mode between intelligent electronic devices, and provides a fast, efficient and reliable method for the communication between logical nodes.

Description

technical field [0001] The invention belongs to the field of electric power system relay protection and automatic control thereof, in particular to a current protection method for a series multi-stage power distribution network based on a GOOSE mechanism. Background technique [0002] Most of the power outages and voltage dips suffered by users in the current power system are caused by faults in the medium-voltage distribution network, and distribution network protection is a fundamental measure to reduce the impact of faults and improve the quality of power supply under the existing grid conditions . The distribution network protection scheme has always emphasized the need to ensure the operation safety of the power grid and obey the protection of the upper-level main transformer, and its configuration and setting coordination are relatively simple. At present, the distribution network in some areas connects multi-level switching stations and power distribution rooms in se...

AI Technical Summary

Problems solved by technology

At present, the distribution network in some areas connects multi-level switching stations and power distribution rooms in series in the line. Due to the short cable distance and small impedance between the stations, the fault current of each place is not much different when a short-circuit fault occurs, resulting in Difficult to cooperate, unable to achieve selectivity in the case of faults, often tripping over the protection level in case of faults, generally expanding the scope of accidents, seriously affecting fault finding and power supply recovery

[0003] In view of this problem, it is necessary to study a relay protection method, which can effectively solve the practical problems such as the expansion of the fault range caused by the non-selectivity of protection under the current distribution network structure, the reduction of power supply reliability, and the difficulty of fault finding. It satisfies the selectivity and rapidity of protection under the short-distance and multi-series complex grid structure of the future distribution network

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