Effect of Coherence Function on Rotational Fourier Spectrum of Wind Turbine

Abstract:

In order to consider the rotational effect of rotor and determine the exact loads of wind turbine generator system, rotational Fourier spectrum was deduced, and the physical nature of the rotational Fourier spectrum was indicated. Importance of coherence function to the rotational Fourier spectrum was analyzed according to physical nature, as well as the parameter sensitivity analysis of decay factor. The result shows that there is a sharp dip of rotational Fourier spectrum at the integer multiple rotational frequencies with Davenport exponential coherence function while it's eliminated with coherence function supplied by IEC international standard. The rotational Fourier spectrum energy removes to the high frequency bands, the amplitudes of peak at the integer multiple rotational frequencies are increased with decay factor increased, which results in rotational effect more obvious.

• Periodical: Advanced Materials Research (Volumes 608-609)
• Pages: 506-512
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.608-609.506
• Online since: December 2012
• Authors: De Tian, Wei He, Ning Bo Wang
• Keywords: Coherence Function, Rotational Fourier Spectrum, Von Karman Spectrum, Wind Turbine (WT)

References

[1] J. R. Connell: Technical report PNL-3426. Battelle Pacific Northwest Lab, Richland, Washington, 1980.

[2] G.L. He, J. Li: Proceedings of the CSEE. Vol. 29 (2009), p.85

[3] J. R. Connell: Solar Energy. vol. 29 (1982), p.363

[4] D. C. Powell, J. R. Connell and R. L. George: Technical report PNL-5440. Battelle Pacific Northwest Lab, Richland, Washington, 1985.

[5] D. C. Powell and J. R. Connell: Technical report PNL-5857. Battelle Pacific Northwest Lab, Richland, Washington, 1986.

[6] P. S. Veers: Technical report SAND83-1909. Sandia National Lab, NM (USA), 1984．

[7] P. S. Veers: Technical report SAND88-0152. Sandia National Labs, NM (USA) 1988.

[8] J. B. Dragt: NASA STI/Recon Technical Report ECN-172, 1985.

[9] T. Von Karman: Proceedings of the NAS ( USA), vol. 34(1948), p.530

[10] J. C. Kaimal, J. C. Wyngaard, Y. Izumi, and O. R. Cote: Quarterly Journal of the Royal Meteorological Society, vol. 98(1972), p.563

DOI: 10.1256/smsqj.41706

[11] L. L. Freris: WMO-Report, Geneva, 1981.

[12] Y. Li, H. Liao and S. Qiang: Computers & Structures, vol. 82(2004), p.1591

[13] T. Burton, D. Sharpe, N. Jenkins, and E. Bossanyi: London: John Wiley & Sons, Ltd, 2001.

[14] IEC61400-1 Third edition 2005-08, I. E. Commission, Ed. Geneva, 2005.