Power distribution network single-phase earth fault positioning method and system

Abstract

The invention belongs to the field of power distribution network fault positioning, and provides a power distribution network single-phase earth fault positioning method and system. The method comprises the steps of selecting zero-sequence current and negative-sequence current information of a half cycle before and after a fault occurs as fault characteristic quantities; based on the topological structure of the power distribution network, constructing a single characteristic quantity differential node matrix by the fault characteristic quantity; fusing the fault characteristic quantity in a time domain-space domain to generate a high-dimensional fault information state monitoring matrix expanded by a single characteristic quantity differential node matrix; conducting dimensionality reduction on the high-dimensional state monitoring matrix to a two-dimensional space through a multi-dimensional scale dimensionality reduction method, solving eigenvalues and eigenvectors of the matrix obtained after dimensionality reduction, and obtaining eigenvectors of all sections; and quantizing the correlation of the feature vectors corresponding to the sections to obtain a correlation coefficient matrix, displaying fault nodes and non-fault nodes on a two-dimensional plane based on a DBSCAN clustering model, and positioning fault sections corresponding to the fault nodes.

Description

technical field [0001] The invention belongs to the field of distribution network fault location, in particular to a distribution network single-phase ground fault location method and system. Background technique [0002] The statements in this section merely provide background information related to the present invention and do not necessarily constitute prior art. [0003] Due to the access of distributed power sources, the single power source structure power supply of the traditional distribution network has become a multi-source network, and the power flow direction has also changed accordingly. In terms of fault line selection, after a single-phase ground fault occurs, the zero-sequence voltage and zero-sequence current have opposite polarities, and the wavelet packet transform is used to multiply the characteristic frequency band components, and the polarity opposite to other lines is the fault line. However, the selection method of wavelet basis functions is empirica...

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Problems solved by technology

[0005] The inventor found that although the above-mentioned artificial intelligence algorithm has good fault-tolerant performance and high stability, when the power distribution network is highly complex, it generally has the problem of convergence difficulties, and it is difficult to adapt to the requirements of the current smart grid for processing massive data.

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