Method for diagnosing fault of rectifying cabinet on the basis of wavelet transformation and Wigner-Ville distribution

A fault diagnosis and wavelet transform technology, applied in the direction of instruments, adaptive control, control/regulation systems, etc., can solve the problems of time-consuming, low reliability, simple methods, etc., to improve the level and reliability, the method is simple, The effect of improving reliability

Inactive Publication Date: 2009-09-02
TIANJIN UNIV
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Problems solved by technology

[0003] The present invention aims at the problems of simple fault diagnosis method, long time-consuming and low reliability of existing water electrolysis hydrogen production rectifier cabinet, and proposes a method based on wavelet transform and Wigner- The signal analysis method of Ville distribution realizes the online diagnosis of th

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  • Method for diagnosing fault of rectifying cabinet on the basis of wavelet transformation and Wigner-Ville distribution
  • Method for diagnosing fault of rectifying cabinet on the basis of wavelet transformation and Wigner-Ville distribution
  • Method for diagnosing fault of rectifying cabinet on the basis of wavelet transformation and Wigner-Ville distribution

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[0017] The present invention will be described in further detail below in conjunction with the accompanying drawings and embodiments.

[0018] figure 1 It is a schematic diagram of a water electrolysis hydrogen production rectifier cabinet. The research object of this example is a water electrolysis hydrogen production rectifier cabinet with an input of 380V / 114A and an output of 1012A / 53V.

[0019] to solve figure 1 The current problems in the fault analysis and diagnosis of the water electrolysis hydrogen production rectifier shown in the present invention provide a network-based online water electrolysis hydrogen production rectifier fault detection scheme, water electrolysis hydrogen production hydrogen rectifier failure The diagnostic system is mainly composed of rectifier cabinet, current sampling sensor, PLC distributed I / O, PLC control station, local monitoring station and other parts. Its basic structure is as follows: figure 2 shown.

[0020] The present inventio...

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Abstract

The invention belongs to the technical field of hydrogen production by water electrolysis, in particular relates to a method for diagnosing the fault of a rectifying cabinet on the basis of wavelet transformation and Wigner-Ville distribution. A decomposing layer number n of wavelets is chosen according to a frequency band where a fault signal among signals is positioned; db1 and db3 are used as generating functions of the wavelets, multiresolution decomposition of n to 1 layers are respectively carried out so as to decompose the original fault signal into n sequences with each of which having only one component; each component is analyzed according to the Wigner-Ville distribution, the Wigner-Ville distribution of all the sequences are combined to form the time frequency of the original signal, and the multiple dimensioned on-line analytical method of the signal is realized. The method can greatly enhance the accuracy for diagnosing the fault, the reliability and the maintenance level of the prior rectifying cabinet for producing hydrogen by water electrolysis so as to ensure that equipment for producing hydrogen by water electrolysis safely and reliably works.

Description

technical field [0001] The invention belongs to the technical field of water electrolysis hydrogen production control, and in particular relates to a fault diagnosis method for a water electrolysis hydrogen production rectifier cabinet. Background technique [0002] The electrolytic rectifier cabinet is one of the important devices of the water electrolysis hydrogen production system, which is of great significance to the safe and reliable hydrogen production. Its function is to change alternating current into direct current. For small capacity (generally below 100KVA), the rectifier transformer can be built in the rectifier cabinet. There are two types of rectification schemes for water electrolysis devices: silicon controlled rectification and silicon rectification. Although with the development of power electronics and other technologies, the reliability of rectifier cabinets is getting higher and higher, but there are still different types of faults such as transformer...

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Application Information

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IPC IPC(8): G05B13/00
Inventor 方红伟许卫肖朝霞张宇
Owner TIANJIN UNIV
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