Study On The Structural Optimization For Pretressed Concrete-steel Hybrid Wind Turbine Tower

As the environmental deterioration and fossil energy reserves decreasing,wind energy,a kind of clean,renewable energy,is becoming more and more important.Goverments and research institutions have paid more and more attention to the development of wind power because it is environmental friendly and reproductable.Currently,because of the increasing capacity of wind power generators and the height of towers,the problems including the increasingly big diameter of the traditional steel towers,transportation difficulties and low efficiency are becoming more and more prominent.The prestressed concrete-steel hybrid wind turbine tower is an efficient new structure system to solve these problems.In order to fully use the capacity of the material and reduce the price of tower,the importance of optimization of the hybrid tower has arisen.In this paper,an optimization approach has been proposed with MATLAB,stress performance analysis and partical swarm optimization to optimize prestressed concrete-steel hybrid wind turbine tower and provide a possibility for wind industry of China.This thesis includes the following four parts:(1)Introduction of several optimization approaches and study of partial swarm optimization.(2)Calculation of load acting on the tower and ensure partial coefficients of 2MW wind turbine of a wind farm under four working condition according to standards of China and foreign countries.(3)Modeling prestressed concrete-steel hybrid wind turbine tower,ensuring optimization variables,illustrating the constraints during the optimization and taking the price of the wind turbine tower as the target function..(4)Optimizing a prestressed concrete-steel hybrid wind turbine tower with engineering example,a wind farm in Hunan Chenzhou and checking the result of the optimization.According to the result,the trend of stress on the wind turbine tower can be obtained.It can be seen through the optimization result that the partial swarm optimization can effectively reduce the price of prestressed concrete-steel hybrid wind turbine tower,and the best result appeared when the steel tube occupy 30%of the wind turbine tower.