BP neural network-based power distribution network fault section positioning method

Abstract

The invention discloses a power distribution network fault section positioning method based on a BP neural network. The method comprises steps of firstly obtaining transient zero-sequence current sampling data in a 1 / 2 cycle after a single-phase grounding fault moment according to zero-sequence current collection equipment installed in a power distribution network; wavelet analysis being carried out on the measured transient zero-sequence current along the line under different fault sections to obtain a corresponding modulus maximum value; taking a certain number of transient zero-sequence current modulus maxima obtained under different fault sections and inputting the modulus maxima into the BP network for training to obtain a relationship between the modulus maxima and the fault sections; wavelet transformation being carried out on a group of transient zero-sequence current data of an actual fault to obtain a modulus maximum value, trained BP parameters being read in for testing, and a fault section positioning result being obtained. The method can avoid the influence caused by the branch line, and is not affected by the cable overhead hybrid line.

Description

technical field [0001] The invention relates to a method for locating a fault section of a power distribution network based on a BP neural network. Background technique [0002] Existing single-phase ground fault section location methods in non-effectively grounded distribution networks can be roughly divided into two categories according to their use of different information: one is the fault section location method based on externally injected signals; the other is the use of single-phase ground fault section location methods. The fault section location method can be divided into the fault section location method based on the fault steady-state component, the fault section location method based on the fault transient component and the comprehensive location method. The structure of the on-site medium-voltage distribution line is complex. For the mixed line of cables and overhead lines, the zero-sequence current will change greatly before and after the junction; The charac...

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Problems solved by technology

The structure of the on-site medium-voltage distribution line is complex. For the mixed line of cables and overhead lines, the zero-sequence current will change greatly before and after the junction; The characteristics of the zero-sequence current obtained will also change greatly, which will affect the correctness of the traditional section positioning method to a certain extent.

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