A method for grid fault diagnosis

Abstract

The invention discloses a grid fault diagnosis method, which belongs to the technical field of grid fault diagnosis. The power outage area is obtained from the protection and circuit breaker information, and the lines in it are taken as suspected fault lines, and their comprehensive current is constructed as a sample sequence; the sample sequence of each suspected fault line and the reference line outside the power outage area are obtained by using the DTW algorithm. The DTW distance between the sequences is constructed as the horizontal difference degree; at the same time, the DTW distance between the sample sequences before and after the fault of each suspected fault line is obtained by using the DTW algorithm, which is constructed as the vertical difference degree. The horizontal and vertical difference degrees of N suspected faulty lines are formed into a 2×N difference degree matrix, and the artificial fish clustering algorithm is used to cluster the matrix, which is divided into fault classes and normal classes, and the one with the larger cluster center value The class is diagnosed as a fault class, and the lines in the fault class are judged as faulty lines. The invention can accurately diagnose the fault line, is not affected by fault location, transition resistance, fault type, etc., and has good performance.

Description

technical field [0001] The invention belongs to the technical field of grid fault diagnosis. Background technique [0002] After decades of continuous development in the related research on power grid fault diagnosis, experts and scholars at home and abroad have put forward many new theories, such as neural network, expert system, Petri net, rough set, etc. Most of these methods rely on protection, circuit breaker Act correctly or receive a complete warning message. When a relatively complex fault occurs in the system or the relevant alarm information is lost in the upload, it may affect the accuracy of the diagnosis result. [0003] However, with the application of new technologies in the power grid, the collection of electrical quantities is becoming more and more convenient. Using the rich information contained in the electrical quantities for fault diagnosis has become a hot spot in the research of grid fault diagnosis. At the same time, electrical quantity information...

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a grid fault diagnosis method, which can effectively solve the problem that the existing grid fault diagnosis methods rely more on switch quantity information and less use of electrical quantity information

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