Research On Lightweight Configuration And Parameter Optimization Of Wind Turbine Tower

Wind power generation is regarded as an important part of energy sustainable development strategy in the world.Wind turbines are moving towards large-scale leading to the increasing weight of the towers,which has led to a series of problems.For example,the transport of wind turbine tower is inconvenient in remote areas and at sea,and the hoisting of the tower is difficult,besides the extent of difficulty in bearing design of offshore tower foundation is increasing as well.The key problem need to be solved is to apply extremely the wind turbine tower material to make the structure more lighter,thereby reducing the weight of the tower.In order to solve the above problems,the paper carries research on the lightweight design of the tower,proposes a new tower configuration,and completes the parameter optimization analysis as well.Lattice tower is the most ideal tower structure to realize the lightweight design of the tower.Referring to the design method of lattice tower,a spiral lattice tower is proposed.The tower consists of two layers inside and outside.As with the traditional tower,the inner layer structure adopts four upright columns,and the upright columns are connected by crossbars.The outer layer is composed of four diagonal columns,and diagonal web members connect the inner and outer columns in a single oblique connection,and the outer columns are connected by curved spiral rods.Based on this structure,a three-dimensional model of the tower is built.The force of the tower is analyzed to verify the performance of the tower.The main loads of the tower,such as wind thrust and hub torque,are analyzed and calculated.The force of the tower under extreme wind speed is also calculated.These obtained loads provide data support for the finite element analysis of the tower.The finite element method is used to analyze the influence of structural parameters on the rigidity of the tower,structural parameters include the section size of the tower members and the inclination angle of the web member,etc,and determines the main influence parameters.Orthogonal experiment is used to further analyze the main influence parameters to verify the influence of the main parameters and obtain the optimal combination of parameters.Then,the strength analysis of the unique curved spiral robs of the tower is performed.The results of comparison between the bending resistance and the torsion resistance of the tower show that compared with the bending resistance,the curved robs have a moresignificant improvement in the torsion resistance of the tower.This paper uses finite element software to analyze and verify the strength and rigidity of the tower.After checking,the strength and rigidity of the tower meet the requirements.The stability of the tower is analyzed through modal analysis and buckling analysis.The low-order modal eigenvalues and buckling eigenvalues indicate that the tower meets the stability requirements.Finally,the response surface optimization method is used to optimize the cross-sections of the columns occupying the main mass of the tower,which reduces the total weight of the tower and improves the strength and stability of the tower.