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
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[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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