Fragility Analysis Of Great Wind Turbine Tower In The Turbulence Wind Farm

With the development of wind power technology, the current trend for wind turbines is to have larger and more powerful units, greater impeller diameter and higher tower. Tower is the important bearing structure to the wind power generation units, bearing the wind wheel force and wind load. But the wind load changes with time and space, the tower becomes very complicated. In the past wind power generation units often damaged and collapsed when hurricane came through, causing enormous loss. As a result, it is significance to study on performance of wind resistance for the wind turbine tower.This article based on both home and abroad existing achievements.discussed the tower dynamic response and dynamic characteristic under varying turbulence wind force,and introduced preliminarily fragility wind force of wind turbine tower, fragility analysis method and fragility curve. By means of the tower structure of fragility research, this paper discussed the possibility of damage of the tower under the turbulence wind force.So it provide theoretical value for performance of wind resistance for the wind turbine tower.The main study of the paper as follows:1.Wind model in wind field is studied, and steady wind.fluctuating wind characteristics, especially the fluctuating wind power spectrum are discussed.2.The simulation of wind velocity time-series using AR model is studied, power spectral density of the fluctuating wind model is establishted, and simulated by Matlab.3. Analysis wind load of wind turbine impeller and tower, offered respective solution methods. Construction dynamic response equation of tower, calculated the action of dynamic response of the wind turbine tower under the wind loads through finite element software under wind loads, got the displacement and stress of the wind turbine tower in dynamic load.4. Put forward the concept of fragility wind force of wind turbine tower, discussed fragility analysis method and drew fragility curve of wind turbine tower in different wind speeds. By means of the tower structure of fragility research.this paper discussed the possibility of damage of the tower under the turbulence wind force.