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A fault diagnosis method for gear transmission system of wind power generator

A wind turbine and gear transmission technology, applied to computer components, instruments, complex mathematical operations, etc., can solve the problems of fault feature recognition interference and small contribution to fault diagnosis, and achieve the effect of short time-consuming and high-efficiency fault diagnosis

Active Publication Date: 2021-08-03
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The revelation of these non-fault order components makes little contribution to fault diagnosis, and when the amplitude of non-fault order components is large, it may also interfere with fault feature recognition

Method used

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  • A fault diagnosis method for gear transmission system of wind power generator
  • A fault diagnosis method for gear transmission system of wind power generator
  • A fault diagnosis method for gear transmission system of wind power generator

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0076] 1) Collect the stator current signal s(t) of any phase of the wind turbine at equal time intervals;

[0077] 2) Perform short-time Fourier transform (or continuous wavelet transform, or other time-frequency analysis methods such as Wigner-Ville distribution) on the collected stator current signal to obtain the time-frequency distribution;

[0078] 3) From the time-frequency distribution, use ridge line extraction (or multi-point fitting method) to obtain the power generation frequency of the wind turbine;

[0079] 4) Calculate the amplitude envelope x(t) of the collected stator current signal s(t);

[0080] 5) According to the number of pole pairs of the wind turbine and the number of teeth of each gear in the gear transmission system, calculate the proportional relationship between the fault characteristic frequency of each gear and the power generation frequency, and obtain the fault order sequence;

[0081] 6) For each fault order in the fault order sequence, the ti...

Embodiment 2

[0084] Embodiment 2 (Using rotational speed signal acquisition to replace ridge line extraction or multi-point fitting)

[0085] 1) The stator current signal s(t) of the wind generator is collected at equal time intervals, and the speed signal of the wind generator is collected synchronously, and the speed signal is approximated as the power generation frequency of the wind generator;

[0086] 2) Calculate the amplitude envelope x(t) of the collected stator current signal s(t);

[0087] 3) According to the number of pole pairs of the wind turbine and the number of teeth of each gear in the gear transmission system, calculate the proportional relationship between the fault characteristic frequency of each gear and the power generation frequency, and obtain the fault order sequence;

[0088] 4) For each fault order in the fault order sequence, the time-varying fault frequency component is converted into a fixed frequency component by generalized demodulation, and the amplitude o...

Embodiment 3

[0091] Embodiment three (acquisition of stator voltage signal, rotor current or voltage signal instead of stator current signal)

[0092] An embodiment of the present invention provides a method for diagnosing a fault in a gear transmission system of a wind power generator, the method comprising:

[0093] 1) Collect any phase stator voltage signal, rotor current signal or rotor voltage signal s(t) of the wind turbine at equal time intervals;

[0094]2) Perform short-time Fourier transform (or continuous wavelet transform, or other time-frequency analysis methods such as Wigner-Ville distribution) on the collected stator voltage signal, rotor current signal or rotor voltage signal to obtain the time-frequency distribution;

[0095] 3) From the time-frequency distribution, use ridge line extraction (or multi-point fitting method) to obtain the power generation frequency of the wind turbine;

[0096] 4) Calculate the amplitude envelope of the collected stator voltage signal, rot...

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Abstract

The invention provides a fault diagnosis method for a gear transmission system of a wind power generator, which belongs to the technical field of fault diagnosis of rotating machinery. The method includes: determining the power generation frequency of the wind power generator; calculating the proportional relationship between the fault characteristic frequency of each gear and the power generation frequency to obtain a fault order sequence; for each fault order in the fault order sequence, through generalized demodulation Convert the time-varying fault frequency component into a fixed frequency component, and calculate the ratio of the amplitude of the fixed frequency component to the average value of all frequency component amplitudes in the signal obtained by generalized demodulation; take the fault order sequence as the abscissa, each The amplitude ratio corresponding to the fault order is the ordinate, and the order spectrum containing only the fault features is obtained; according to the magnitude ratio of the fault order in the order spectrum, the fault diagnosis of the gear transmission system of the wind turbine is carried out. By adopting the invention, the efficiency of fault diagnosis of the transmission system of the wind power generator can be improved.

Description

technical field [0001] The invention relates to the technical field of fault diagnosis of rotating machinery, in particular to a fault diagnosis method for a gear transmission system of a wind power generator. Background technique [0002] As an important clean energy source, wind power has developed rapidly in recent years. However, due to the long-term operation of wind turbines under non-stationary speed and load, the performance of the transmission system degrades rapidly. If the failure is not detected and eliminated in time, it is easy to cause transmission failure or even catastrophic accidents. Fault diagnosis of wind turbine transmission system is of great significance for promoting the development of wind power industry and ensuring my country's energy security. [0003] The wind power gearbox is the core component of the wind turbine transmission system. Due to the long downtime and high maintenance cost caused by gear failure, there is an urgent need for effecti...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F17/14G06F17/18G06K9/00
CPCG06F17/14G06F17/18G06F2218/10
Inventor 冯志鹏陈小旺
Owner UNIV OF SCI & TECH BEIJING