Power distribution network feeder fault type identification method and device

Abstract

The invention relates to a power distribution network feeder fault type identification method and device. According to the method and device, the transient information of post-fault related electric quantity is mainly utilized to realize fault identification. The method includes the following steps that: waveform sampling data are obtained at first, local feature scale decomposition, Hilbert transform and band-pass filtering are sequentially performed on the waveform sampling data, so that a reconstructed time-frequency matrix can be obtained; and the singular spectrum of the time-frequency matrix is solved, and the distribution parameters of the singular spectrum are extracted so as to construct feature vector matrixes, normalized processing is performed on all the feature vector matrixes, and the normalized feature vector matrixes are adopted as the input samples of a multi-level support vector machine, so that feeder fault type identification can be realized. The power distribution network feeder fault type identification method and device of the invention have the advantages of high fault type recognition accuracy and strong adaptability under conditions such as a noise interference condition.

Description

A method and device for identifying fault types of distribution network feeders technical field The invention relates to the field of power system distribution network, in particular to a method and device for identifying a fault type of a distribution network feeder. Background technique The structure of the distribution network is complex, and it is inevitably affected by various faults under actual working conditions, among which short circuit and grounding are relatively common electrical faults. When a fault occurs, in order to ensure the reliability of the power supply, the faulty section should be located and isolated in a timely and effective manner, so as to ensure the normal power supply of the non-faulty area and eliminate the many adverse effects caused by the fault. The distribution network fault handling technology should respond in time, and its primary task is to use the fault voltage, current and other fault signals obtained during the fault to detect and ...

AI Technical Summary

Problems solved by technology

Due to the need to calculate the distance value multiple times, the amount of calculation is relatively large, which may affect the actual operating efficiency of the device, and the online identification time is therefore prolonged

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