Characteristic-assisted partial discharge point positioning method

Abstract

The invention discloses a feature-assisted partial discharge point positioning method, which comprises the following specific steps of: (1) collecting and primarily processing a partial discharge signal, collecting the partial discharge signal of power equipment through a partial discharge detection device, and obtaining position measurement information, a partial discharge pulse signal, a spectrogram and other information of a partial discharge point after processing; (2) modeling for time domain and frequency domain features, using amplitude as a time domain feature and using a frequency spectrum as a frequency domain feature; and (3) fusing the time domain and frequency domain features with Gaussian mixture probability hypothesis density filtering, and correcting the weight of the Gaussian component of the partial discharge point by using the features. According to the method, on the basis of Gaussian mixture probability hypothesis density filtering, time-frequency domain features are fused, so that clutter interference can be suppressed, and positioning of partial discharge points in a strong clutter environment is realized. The method has the advantages of high response speed, high anti-interference capability, high positioning accuracy and the like.

Description

Technical field [0001] The present invention relates to the field of partial discharge positioning of electrical equipment, specifically to a feature-assisted partial discharge positioning method. Background [0002] The detection of partial discharge signal can be used as an effective means for the evaluation of the insulation state of the equipment, and it is also an important prerequisite for the localization of the partial discharge point and the fault location of the power equipment. There are various noises in the working environment of power equipment, and it is crucial to distinguish between partial discharge signals and noise signals to achieve the extraction of partial discharge signals in this complex noise strong clutter environment. [0003] The traditional power equipment partial discharge positioning problem is mainly based on the distance between each sensor and the local discharge point, the time of receiving the signal is not the same, according to the time diff...

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Problems solved by technology

[0005] The present invention is aimed at the problem that there is strong clutter noise in the partial discharge point detection and positioning environment, so that accurate positioning cannot be obtained, and a feature-assisted partial discharge positioning method is designed. The feature parameters comprehensively estimate the position of the partial discharge point, realize the suppression of clutter in the process of partial discharge location, and improve the anti-interference and positioning accuracy of the partial discharge point location method

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