考虑运转工况的风力机结构体系抗风沙性能对比研究OA

China plans to build 450 GW wind and solar power bases in desertified areas,which are characterized by frequent wind and sand activities.Wind turbines in such areas are exposed to sand and dust environments for 1/10 to 1/6 of the time,leading to an increase in the types of loads on wind tur-bine support structures and higher failure risks.Therefore,studying the wind and sand resistance per-formance of wind turbine support structures is of great significance for their future construction in de-sertified areas.Different wind speeds not only result in differences in the wind and sand loads on the support structures,but also cause the wind turbine power generation control system to adjust the im-peller speed.The differences between various operating conditions are mainly reflected in the impeller speed.Different speeds lead to varying degrees of centrifugal stiffening effect of the impeller,which in turn affects the dynamic response of the entire turbine.However,existing research on the wind and sand resistance performance of wind turbines has not considered the impact of wind turbine operating conditions,and has focused only on the conical wind turbine support structure,without involving oth-er forms of support structures.To address the above problems,this study established full-scale mod-els of typical 1.5 MW wind turbine structures,namely the conical type and concrete-filled steel tubular lattice type,respectively.The centrifugal stiffening effect of the impeller under operating conditions was reproduced by directly simulating the impeller rotation.Furthermore,the coupled influence of dif-ferent stiffening effects caused by the impeller and the different levels of wind and sand load changes on the support structures was considered.Additionally,a comparative analysis was conducted on the wind and sand resistance performance of different wind turbine support structures under operating con-ditions.The results showed that compared with the conical support structure,the three-legged column support structure exhibited smaller displacement and acceleration responses due to its higher stiffness.The impeller rotation had a relatively small impact on the displacement response of the conical support structure,but exerted certain influence on the displacement of the three-legged column support struc-ture.In addition,the calculated tower-top acceleration,blade deformation,and stress when consider-ing the centrifugal stiffening effect were significantly lower compared to those without considering im-peller rotation,and the influence of impeller rotation was more pronounced at lower wind speeds.