Nonlinear characteristics of wind turbines’seismic induced nacelle vibration
LIU Zhongsheng1,YANG Yang1,LI Chun1,2,ZOU Jinhua1,YUAN Quanyong1
1.School of Energy and Power Engineering,University of Shanghai for Science and Technology,Shanghai 200093,China;
2.Shanghai Key Lab of Multiphase Flow and Heat Transfer in Power Engineering,Shanghai 200093,China
The seismic dynamic simulation module for wind turbines was developed with self-programming based on the open-source code FAST and Wolf soil-structure interaction model.Compared with the Seismic Tool published in reference,the reliability of the established wind turbines’seismic dynamic simulation model was verified.The seismic dynamic responses of 3 wind turbines with different powers under 5 earthquake excitations were computed.The fractal and chaos theories were employed to analyse their seismic induced vibrations’nonlinear characteristics.The results showed that wind turbines’seismic induced nacelle vibrations have obvious nonstationary features,the wind-earthquake interaction effect must be considered for large-scale wind turbines; the fractal dimensions of seismic induced vibration acceleration time history curves are within a range of 1.6 to 1.8 with higher self-similarity and long-range correlations; for small wind turbines with weaker wind-earthquake interaction effect,there is a higher relevance between the vibration curves’fractal dimensions and earthquake intensity; obvious chaotic characteristics can be observed from seismic induced nacelle vibrations; the seismic induced vibrations are aperiodic and non-completely-random non-stationary vibration processes; for wind turbines with strong wind-earthquake interaction effect,there is a larger relevance between the maximum Lyapunov exponents of seismic induced vibration time history curves and earthquake intensity; the stronger the wind-earthquake interaction effect,the shorter the time length to predict vibration,and the stronger the vibration instability.
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