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

A support vector machine and wavelet packet analysis technology, applied in the direction of instruments, measuring electronics, measuring devices, etc., can solve problems such as the difficulty of locating faults, achieve effective fault identification, realize fault identification, and simple kernel functions

Inactive Publication Date: 2015-06-10
JIANGNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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.

Method used

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

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Embodiment Construction

[0026] The present invention will be further described below in conjunction with the drawings.

[0027] An embodiment of the method for fault diagnosis of a three-phase PWM rectifier based on wavelet packet analysis and support vector machine of the present invention includes the following steps:

[0028] (1) such as figure 1 Shown is the schematic diagram of the three-phase PWM rectifier circuit. According to the principle of the rectifier, the fault types are divided into five major categories and twenty-two subcategories, that is, the fault types of the three-phase PWM rectifier are obtained.

[0029] 1) The IGBT power tubes are operating normally, and the rectifier has no faults.

[0030] 2) Only a single IGBT power tube fails, and there are six categories.

[0031] 3) Two IGBT power tubes have failed, and the two power tubes have the same phase and different sides. There are three types in total.

[0032] 4) Two IGBT power tubes have failed, and the two power tubes have different ph...

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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 power electronic device fault diagnosis, 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, a rectifier device that can achieve the goal of energy conversion has become an ideal electrical equipment or an interface between the grid and other electrical equipment because it can achieve no grid pollution and adjustable power factor. 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 the electrical device at least, threaten personal and property safety, and even cause major accidents. Therefore, fault diagnosis and identification of power electronic equipment is Especially important. In the rectifier system, any unit or device will fail. The open circuit an...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R31/00
Inventor 沈艳霞周文晶纪志成赵芝璞潘庭龙吴定会
Owner JIANGNAN UNIV
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