Effect of Wind Shear on Rotational Fourier Spectrum of Wind Turbine

摘要

In order to accurately obtain the influence of rotational effect on fluctuating component of turbulent wind acted on wind turbine,considering source spectrum and rotational sample points were changed since wind shear changed mean wind speed in the rotor plane along the vertical direction,rotational Fourier spectrum with wind shear was deduced.Based on the investigation on a 3MWthree-bladed pitch regulated wind turbine,rotational Fourier spectrums with and without wind shear were compared,the effect of radius on rotational Fourier spectrum was analyzed,cross power spectral densities of rotational Fourier spectrum with different blades and variable radius were compared.The results show that the effect of wind shear on amplitude of rotational Fourier spectrum is unconspicuous while the phase frequency characteristic is alternative for the sample points are changed.Rotational Fourier spectrum energy removes to the high frequency bands,the amplitudes of peak at the integer multiple rotational frequencies increase with radius increases.The initial phase has little influence to the amplitude of spectrum,and cross power spectral densities of different radius are obviously less than auto power spectral densities of the same radius.