Method for extracting embedded fault features in WAMS information of electric power system

Abstract

A method for extracting embedded fault features in WAMS information of an electric power system comprises the following steps of (a) selecting initial variables in the WAMS information of the electric power system, and proceeding with a step (b) if significant difference does not exist in the sample variance, otherwise proceeding with a step (c); (b) calculating a correlation coefficient matrix of the initial variables, calculating the proper values and the unitized feature vectors of a covariance matrix, and proceeding with a step (d); (c) calculating a covariance matrix of the initial variables, calculating the proper values and the unitized feature vectors of the covariance matrix, and proceeding with the step (d); (d) proceeding with the step (a) to reselect initial variables if the proper values are close to zero, otherwise proceeding with a step (e); (e) confirming a final result of a principal component through the unitized feature vectors; (f) locating a fault element according to the node coefficient of the principal component. The method for extracting the embedded fault features in the WAMS information of the electric power system is strong in interference resisting capacity, capable of meeting the requirement for redundancy of the system, and capable of meeting the requirements for real-time performance and accuracy of fault location in a backup protection system in a wide range.

Description

technical field [0001] The invention relates to a method based on principal component analysis (PCA) to extract embedded fault features from power system WAMS (Wide Area Measurement System) information, belonging to the technical field of power transmission and distribution. Background technique [0002] With the rapid development of AC and DC UHV transmission and smart grids, the security issues of the grid have become more and more prominent. The traditional relay protection system has highlighted many incompatibility in the process of upgrading the grid. In recent years, the wide-area backup protection system has been paid more and more attention by people, and the key to effectively protect the power grid by the wide-area backup protection system is to obtain the fault information of the power system quickly and accurately. [0003] There are many information measurement points in the power system, and the real-time electrical quantity information provided by the PMU (sy...

AI Technical Summary

Problems solved by technology

[0002] With the rapid development of AC and DC UHV power transmission and smart grids, the security issues of the power grid are becoming more and more prominent. The traditional relay protection system has highlighted many inadaptability in the process of upgrading the power grid.

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