Power distribution network single-phase earth fault line selection method

Abstract

The invention relates to a power distribution network single-phase earth fault line selection method, which comprises the following steps of 1, extracting fault features from a small current groundingsystem, and constructing a power distribution network single-phase earth fault neural network line selection model; 2, training a neural network line selection model based on an ant colony algorithm,and finding out an optimal value of a neural network parameter; and 3, completing power distribution network single-phase earth fault line selection based on an ant colony algorithm. On the basis ofan existing single-phase earth fault line selection method, an improved ant colony algorithm is introduced, and fault features in the improved ant colony algorithm are extracted through wavelet transform and Fourier transform to serve as input of a neural network. The neural network is trained by using an ant colony algorithm, and the trained neural network model is completed to realize fault lineselection. According to the invention, the ant colony algorithm is applied to the power distribution network single-phase earth fault line selection system, the defects of a fault line selection method based on a neural network are overcome, and the training speed and the line selection precision of the neural network are effectively improved.

Description

technical field [0001] The invention belongs to the technical field of line selection for single-phase ground faults in distribution networks, and in particular relates to a line selection method for single-phase ground faults in distribution networks based on an improved ant colony algorithm. Background technique [0002] In the field of 6-66kV power grid in my country, the low-current grounding method is mainly adopted. When a single-phase ground fault occurs, it can be operated with a ground fault for 2 hours to improve the reliability of power supply. However, if the ground current is large or a permanent ground fault occurs, the ground arc will continue to burn, and an arc-to-ground overvoltage will occur, which may cause a phase-to-phase short circuit fault. [0003] So far, many substations still use the method of manually pulling the line to find the faulty line. With the continuous development of power grid automation level, the problem of line selection for small ...

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Problems solved by technology

However, if the ground current is large or a permanent ground fault occurs, the ground arc will continue to burn, and an arc-to-ground overvoltage will occur, which may cause a phase-to-phase short circuit fault

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