Grid fault diagnosis method based on fuzzy integral multi-source information fusion theory

Abstract

The invention discloses a grid fault diagnosis method based on a fuzzy integral multi-source information fusion theory. The method comprises: step one, electrical quantity and switching value fault information is obtained; step two, pretreatment is carried out on the fault information obtained at the step one, a wavelet analysis is carried out on the electrical quantity to obtain a wavelet singularity xj1 and a wavelet fault degree xj2; a Bayesian network diagnosis is carried out on the switching value and a fault degree xj3 of the switching value is obtained based on a Bayesian theory; and step three, on the basis of a fuzzy integral algorithm theory, fusion of the wavelet singularity xj1, the wavelet fault degree xj2, and the fault degree xj3 of the switching value that are obtained at the step two is carried out, thereby obtaining a final decision-making result. Therefore, occurrence of a model error that is caused by only using a switching value or an electrical quantity to diagnose a grid fault can be reduced.

Description

technical field [0001] The invention relates to the technical field of grid fault diagnosis, in particular to a grid fault diagnosis method based on fuzzy integral multi-source information fusion theory. Background technique [0002] The power grid is the backbone of the national economy, and economic development is inseparable from the development of the power grid. Once a large-scale power outage occurs, immeasurable losses will occur. In recent years, my country has ushered in the rapid development stage of power grid construction, and the research on fault diagnosis methods of power grid has become the focus of domestic and foreign scholars. Therefore, grid fault diagnosis has become a concern of power system researchers and power equipment manufacturers. However, due to the unpredictability of the occurrence of power grid faults and the extremely complex principles of protection devices, the accuracy of determining faulty equipment only by electrical quantities is not ...

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Problems solved by technology

[0004] Traditional power grid fault diagnosis mostly only uses electrical quantities or protection information, but due to the uncertainty of fault information, it will lead to misjudgment and missed judgment, which will expand the diagnosis of faulty components and cause misjudgment. Therefore, only switch value fault diagnosis is used. unsatisfactory

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