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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, avoid data normalization, and realize the effect of fault identification

Inactive Publication Date: 2013-05-22
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 accompanying drawings.

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

[0028] (1) if figure 1 The schematic diagram of the three-phase PWM rectifier circuit is shown. According to the principle of the rectifier, the fault types are divided into five categories and twenty-two sub-categories, 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, a total of six subcategories.

[0031] 3) There are two IGBT power tubes failing, and the two power tubes are in the same phase and on different sides, a total of three sub-categories.

[0032] 4) Two IGBT power tubes are faulty, and the two power tub...

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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 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...

Claims

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Application Information

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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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