A Fault Line Selection Method of Distribution Network Based on Adaptive Scale Symlets Wavelet

Abstract

The invention discloses a distribution network fault line selection method based on self-adaptive scale Symlets wavelet, which comprises the following steps: S1: receiving the voltage increment and current increment of each line in the distribution network; Perform wavelet transformation on the voltage increment coefficient sequence to obtain the voltage increment coefficient sequence; S3: Perform singularity test on the voltage increment coefficient sequence to obtain the time tk corresponding to the maximum value in the voltage increment coefficient sequence; S4: Perform multi-scale decomposition on the current increment, Obtain the modulus maximum matrix Z corresponding to the current increment at time tk ij ;S5: The maximum value Z of the sum of the modulus maxima corresponding to different scales ∑i , to determine the line selection comparison scale j max ; S6: compare scale j in the same line selection max Next, compare the modulus maximum values ​​of different line numbers: take the line with the largest modulus maximum value and opposite polarity to that of other lines as the faulty line. The invention has the technical characteristics of fast, accurate, simple and efficient fault line selection.

Description

technical field [0001] The invention belongs to the field of electric power, in particular to a fault line selection method of distribution network based on adaptive scale Symlets wavelet. Background technique [0002] With the rapid development of my country's electric power industry, the scale of the distribution network continues to expand and develop with the increase in load, and the process of distribution network automation transformation is also accelerating. The structure of modern power systems is becoming more and more complex. The hazards to operational safety are increasing day by day. After a short-circuit fault occurs, sometimes it is difficult to find the fault point. Although the protection action removes the fault, due to the change of insulation, the hidden fault cannot be eliminated in time. Single-phase ground faults have a high probability of occurrence, and the problems of line selection and location have not been effectively solved for a long time. H...

AI Technical Summary

Problems solved by technology

After a short-circuit fault occurs, sometimes it is difficult to find the fault point. Although the protection action removes the fault, due to the change of insulation, the hidden fault cannot be eliminated in time.

The probability of single-phase ground faults is high, and the problems of line selection and location have not been effectively solved for a long time

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