Doubly-Fed Wind Turbine Failure Diagnose Method And Realization

The paper expatiates advantage of wind turbine and its development in our country. Aiming at failure of the transmission chain of the wind turbine(for example:main-shaft, gearbox etc) and tower,the paper analyze the fault of SUT-1000 wind turbine designed independently by Wind Energy Institution ShenYang University of Technology,and put forward reasonable project of fault diagnosis online according to wavelet theory.The paper put forward the important status of wind turbine in domestic economic through explaining its advantage and problem,thereby demonstrates the meaning of wind turbine measure and diagnose on line.Then,the paper introduces the wavelet theory simply and illuminates the advantage of wavelet analysis theory on wind turbine diagnosis. Meanwhile,based on the practical condition of the wind turbine designed by the Wind Energy Institute ShenYang University of technology,and analyzing normal failure and finding the components easily gone wrong of wind turbine,so the actual construction program of vibration monitoring is decided.Then,the vibration signal from key parts (gearbox,generator etc.) of transmission chain is analyzed with FFT method.Utilizing wavelet analysis module in MATLAB,we can set threshold to eliminate noise,and farther apply wavelet function to implement multi-measure analysis calculation of data.At last, the paper studies the failure diagnosis method of tower.On the one hand,the natural frequency is figured out by using MSC software,on the other hand,the maximum amplitude of vibration is also calculated.According to calculation value above that is regarded as the standard of vibration online,we can set the alarm value,and put forward reasonable project to measure the condition of wind turbine anytime.The experiment data used in the paper wholly comes from the testing of wind turbine on the spot,so it confirms to actual condition of wind turbine.The paper adopts wavelet analysis method combined with finite element analysis to get diagnosis result precisely, and compares the practical condition with diagnosis result,the correctness of result is proved.At last,according to the experience of testing diagnosis,we achieves the tower concept design of MW wind turbine diagnose and measure on line system.