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Online Fault Diagnosis Method and System for Excitation Power Unit Based on Synchronous Time Window

A fault diagnosis system and excitation power technology, applied in instruments, motor generator testing, measuring devices, etc., can solve the problems of poor real-time performance and low accuracy of fault diagnosis.

Inactive Publication Date: 2018-10-19
CHONGQING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to propose an online fault diagnosis method for excitation system power units based on synchronous time windows; this method solves the problem of poor real-time performance and low accuracy of current excitation system power unit fault diagnosis

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  • Online Fault Diagnosis Method and System for Excitation Power Unit Based on Synchronous Time Window
  • Online Fault Diagnosis Method and System for Excitation Power Unit Based on Synchronous Time Window
  • Online Fault Diagnosis Method and System for Excitation Power Unit Based on Synchronous Time Window

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Embodiment 1

[0068] The synchronous time window method provided in this embodiment is a method that can ensure that the sampling period is completely synchronized with the period of the signal under test, and can record accurate time-domain characteristics of the signal under test. The method does not add any hardware, and uses the existing signal of the excitation system to realize the complete synchronization of the sampling of the DC pulsation waveform and the synchronous trigger signal of the power unit. The A-phase synchronous trigger pulse signal of the three-phase fully controlled bridge is selected as the A / D sampling trigger signal per cycle. When the rising edge is detected, the A / D sampling starts to work. In order to make the subsequent FFT calculation accurate and fast, the number of sampling points per cycle Adhere to the "radix-2" algorithm. Afterwards, every time the rising edge of the trigger pulse is detected, the sampling interval is corrected according to the measured f...

Embodiment 2

[0094] This embodiment also provides an on-line fault diagnosis system for excitation system power units based on a synchronous time window, including an original signal acquisition unit, a preprocessing unit, a zero-crossing detection unit, a fault judgment unit, and a fault location judgment unit;

[0095] The original signal acquisition unit is used to collect the original working signal of the power unit of the excitation system;

[0096] The preprocessing unit is used to preprocess the original signal;

[0097] The zero-crossing detection unit is used to detect the zero-crossing of the original signal;

[0098] The fault judging unit is used to judge the fault type of the power unit of the excitation system according to the characteristics of the zero crossing point and perform FFT processing on the fault signal;

[0099] The fault location judging unit is used for judging the fault location according to the fault type and zero-crossing detection.

[0100] The zero-cros...

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Abstract

The present invention discloses an excitation power unit online fault diagnosis method based on a synchronization time window. The method comprises: collecting original signals; performing preprocessing of the original signals; performing zero crossing detection of the sampled signals to obtain fault features; determining whether there are faults or not according to the fault features, and performing FFT processing of the fault signals and determining the fault type of the fault signals; and determining the fault position according to the fault type and the zero crossing detection. The excitation power unit online fault diagnosis method based on a synchronization time window is suitable for excitation system power unit fault diagnosis and power electronic device fault diagnosis; and moreover, through adoption of the synchronization time window sampling technology, the excitation power unit online fault diagnosis method and system based on the synchronization time window can obtain fault feature quantity and determine and locate faults according to the threshold of the feature quantity so as to greatly shorten the diagnosis time, satisfy the online diagnosis requirement and realize accurate location.

Description

technical field [0001] The invention relates to the field of motor fault diagnosis, in particular to an online fault diagnosis method for an excitation power unit based on a synchronous time window. Background technique [0002] The power unit of the synchronous motor excitation system is mainly composed of a three-phase fully-controlled bridge, the main component of which is the easily damaged power electronic component thyristor. Therefore, it is very necessary to carry out real-time online fault diagnosis for the main circuit of the power unit of the excitation system. At present, the techniques for this type of fault diagnosis in practical applications all have the disadvantages that they cannot be accurate to the component level and cannot meet real-time performance. The technologies used in the field of fault diagnosis of excitation system power units include fast Fourier method (FFT), neural network method, support vector machine method, fuzzy theory, wavelet analysi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R31/34
CPCG01R31/343G01R31/346
Inventor 刘伟龚俊名
Owner CHONGQING UNIV OF TECH