SEISMIC ANALYSIS OF A 600KW WIND TURBINE IN FREQUENCY DOMAIN AND TIME DOMAIN

Wind energy has developed widely in many regions of China and some regions are seismic-active areas. At present, the seismic analysis of wind turbines is not considered adequately. As a kind of high-rise structure, a wind turbine should be designed by dynamic analysis of earthquake to ensure its safety. In this paper, based on a real 600kW wind turbine in China, a finite element (FE) model of wind turbine system is built by ANSYS, consisting of the rotor, the nacelle, and the tower. The results of modal analysis show that the blade azimuth doesn't affect the natural frequency of the wind turbine. In the time history analysis, the responses of the tower displacement, acceleration, bending moment are investigated through inputting an artificial seismic fitted acceleration wave according to the design response spectrum. The value and the location of the maximum displacement, acceleration, stress and moment are found and compared with the results from the response spectrum analysis. The corresponding conclusions are drawn, which can provide a reference for engineering design.