Three-phrase pulse-width modulation (PWM) rectifier fault diagnosis method based on wavelet packet analysis and support vector machine

Abstract

The invention discloses a three-phrase pulse-width modulation (PWM) rectifier fault diagnosis method based on wavelet packet analysis and a support vector machine. The three-phrase PWM rectifier fault diagnosis method based on wavelet packet analysis and the support vector machine includes the steps: first, building a three-phrase PWM rectifier, determining classification principles and utilizing a wavelet packet arithmetic to analyze a direct current side output voltage of the rectifier; then, conducting energy spectrum and power spectrum analysis on a rebuilt small signal, determining a fault characteristic vector and building a data sample; and finally, choosing a support vector machine kernel function and a parameter, and building a multiple-value classifier so as to achieve fault diagnosis of the three-phrase PWM rectifier. The three-phrase PWM motor-generator set fault diagnosis method based on wavelet packet analysis and the support vector machine can improve fault diagnosis rate of the three-phrase PWM motor-generator set, avoid the problems of the data process and optimization of the traditional test method and effectively improve safety of an electric and electronic rectifier device.

Description

technical field [0001] The invention relates to the field of fault diagnosis of power electronic devices, in particular to a three-phase PWM rectifier fault diagnosis method based on wavelet packet analysis and support vector machine. Background technique [0002] With the rapid development of power electronics technology, the rectifier device that can achieve the goal of energy conversion, because it can achieve no grid pollution and adjustable power factor, has become an ideal interface between electrical equipment or grid and other electrical equipment. At the same time, the fault problem of power electronic equipment is becoming more and more prominent. Once the equipment fails, it will cause damage to electrical devices, and it will threaten personal and property safety, and even cause major accidents. Therefore, fault diagnosis and identification of power electronic equipment is a must. especially important. In the rectification system, any unit or device will fail, a...

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Problems solved by technology

[0003] Due to the complex types of faults in power electronic equipment and many reasons, it is often difficult to locate faults only by manual inspection and maintenance. Therefore, it is required to use a method that can detect and identify faults for fault diagnosis of equipment.

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