Power distribution network single-phase earth fault identification method and system, terminal and medium

Abstract

The invention discloses a power distribution network single-phase earth fault identification method and system, a terminal and a medium, and relates to the technical field of power distribution network fault identification. The method comprises the following steps:according to the zero-sequence equivalent network, constructing a characteristic project conforming to the grounding fault, wherein the characteristic project comprises an amplitude cycle wave, a break variable amplitude cycle wave and a phase cycle wave which are respectively corresponding to the zero-sequence voltage and the zero-sequence current; performing dimension reduction optimization processing on the characteristic project by adopting a principal component analysis process to obtain a fault feature set; constructing a single-phase earth fault classification model by a machine learning algorithm according to the fault feature set; and inputting the fault acquisition data into the single-phase earth fault classification model for fault identification to obtain a fault identification result. The accuracy of the model is improved, and the identification generalization capability of resisting the grounding fault under the strong interference and severe working condition is improved.

Description

technical field [0001] The present invention relates to the technical field of distribution network fault identification, more specifically, it relates to a single-phase ground fault identification method, system, terminal and medium of distribution network. Background technique [0002] The grounding methods of the medium and low voltage distribution network (3-66kV) are mainly two ways: the neutral point is not grounded, and the neutral point is grounded through the arc suppression coil. It is also often called a small current grounding system. In distribution network faults, the occurrence probability of single-phase-to-ground faults accounts for nearly 60-80% of the total fault events, and most phase-to-phase faults are caused by single-phase-to-ground faults. Fault is of great significance to the effective prevention of fault deterioration and scope expansion. [0003] At present, the single-phase ground fault identification algorithm mainly includes: transient method ...

AI Technical Summary

Problems solved by technology

Although these transient signal methods are ideal for dealing with faults with large zero-sequence currents, when the fault zero-sequence current is small in actual operation, they are easily affected by the comprehensive systemic effects of multiple links such as start-up setting, sampling noise, and electromagnetic interference. , which ultimately makes the algorithm less sensitive, too affected by different working conditions of the distribution network, and overly dependent on the differential configuration of various configuration parameters

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