Analysis Of Wind Turbine Tower And Research On Catastrophe Control

With the rapid development of the wind power industry,high-cost large-megawatt windturbines need to have higher safety in the face of extremely complex disasters.Therefore,the research and analysis of the response and working status of large wind turbines under extreme conditions have great practical significance.In this paper,according to the related parameters of a 3MW class horizontal axis wind turbine,the corresponding wind turbine model is established through relevant design methods.Using the Workbench finite element software,the fluid-solid coupling analysis of the wind turbine model was conducted,and the response results of the flow field and the structure under the rated wind speed were obtained.The results of structural responses at different wind speeds were analyzed,and the structure was optimized and demonstrated.At the same time,modal analysis and seismic response analysis were performed on the fan structure.Conclusions are as follows:(1)Wind turbine structure Under the action of wind load,the maximum displacement of the blade occurs at the tip of the blade,the maximum stress occurs in the middle part of the blade;the maximum displacement of the tower tube appears at the top of the tower,and the maximum stress occurs at the front end of the tower bottom.When the wind speed reaches the cut-out wind speed,the tower reaches the displacement limit.As the wind speed increases,the maximum stress and displacement of the tower increase,but the increase ratio decreases as the wind speed increases.(2)The optimized design of the fan’s power and safety regulation not only helps to regulate the output power of the fan,but also can effectively reduce the stress and displacement of the tower under extreme wind conditions,and improve the wind resistance and safety of the tower.Sex,while the optimized mass concentration can effectively reduce the structural vibration caused by external loads.(3)In the modal analysis,the first two modes of the simplified model of hewindgenerator are close to the complete model,which can be used as a simplificatiomethod for modal analysis.The modal deviation between the no-mass model and the complete model is large.Whether to consider the eccentricity of the mass point has little effect on the analysis results ofthe modality.(4)Under the earthquake load,the tower has the same magnitude of earthquake.Longitudinal earthquake action has greater influence on the tower than transverse earthquake action.Comparing with the tower wind stress and displacement with great wind speed,the wind load controls the tower’s overall displacement and tower bottom stress,and the earthquake load controls the tower top stress.There is a big gap between the seismic response of the simplified model and the complete model of the mass point,and it should not be used as a simplified model for seismic analysis.