Noise Characteristic Study of 2.2 MW Large Wind Turbine Based on Hilbert-Huang Transform
HE Jie1,ZHANG Shiwei1,SUN Bingchuan1,XUE Minghua2,SU Mingxu1
1. School of Energy and Power Engineering, University of Shanghai for Science and Technology, Shanghai 200093, China
2. Shanghai Minghua Electric Power Technology Co.Ltd, Shanghai 200090, China
Abstract：To measure the aerodynamic noise of a 2.2 MW horizontal-axis wind turbine,six measurement points were set up in a large wind farm.The points were placed in the upwind,downwind,and at a 60° angle around the turbine.The trends of total sound pressure level(TSPL) of measurement points were obtained by 1/3 octave analysis under the wind speeds ranging from 6.55～15.00m/s.On the basis,the empirical modal decomposition(EMD) and Hilbert-Huang transform(HHT),combined with the marginal spectra,were applied to obtain the key time-frequency characteristics of wind turbine noise.The results showed that the total sound pressure levels at the 60° measurement points are similar to those of the standard measurement points in the same direction.However,the noise level at measurement point 4#,located upwind of the wind turbine,is relatively lower.The variance contribution ratio and correlation coefficient derived from the EMD reveal that the primary energy of the noise is concentrated in the frequency band of 770~1120Hz.The principal frequency of the fitted marginal spectrum is in good agreement with the cubic relationship of the corresponding wind speed.
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2024, Vol. 45 
