Power distribution network fault positioning method and device

Abstract

The invention provides a power distribution network fault positioning method and device, and the method comprises the steps: obtaining three-phase current sampling data of each node of a line, and carrying out the feature extraction of the sampling data; inputting the extracted feature data into a pre-trained adaptive convolutional neural network model, and outputting a fault line phase between fault nodes; performing double-end fault positioning on the fault line to obtain a fault position of the fault line between the fault nodes; wherein the adaptive convolutional neural network model is obtained by training according to the known fault line phase as a sample label and the characteristic data of the three-phase current sampling data of each node as sample input. According to the method, the online diagnosis time can be shortened through the adaptive convolutional neural network model, and the phase of the fault line does not need to be evaluated through frequency, fault position and transition resistance, so that the influence of factors such as system frequency, fault position and transition resistance is small. The problem of low positioning precision in complex power transmission fault detection by only adopting a fault distance measurement method can be avoided.

Description

technical field [0001] The present invention relates to the technical field of power systems, and in particular, to a method and device for locating faults in a distribution network. Background technique [0002] In the distribution system, the failure of the transmission line seriously affects the safety, stability and reliability of the distribution network operation, and will further cause corresponding economic losses to the power production and operation departments and users. In addition, due to the complex structure, large scale and wide coverage of the distribution network, ground faults occur from time to time, which brings certain challenges to the safe and stable operation of the regional power grid. [0003] The existing methods for fault diagnosis of distribution network mainly include: fault location method. Among them, the fault location principle of the impedance method is that under the assumption that the line parameters remain uniform, since the fault loo...

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Problems solved by technology

Impedance method has less investment, but it is greatly affected by actual line impedance, load and power su

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