Semi empirical calculation method for mean wind-induced response of megawatt wind turbine tower in parked condition
HUANG Guoqing1, YUAN Ding1, LIU Min1, XU Nan2
1.Department of Civil Engineering, Chongqing University, Chongqing 400045, China;
2.China General Nuclear Power Group New Energy Holdings Co., Ltd., Beijing 100000, China
Abstract：The response of a wind turbine is usually estimated by numerical simulation software or analytical formulas based on the wind field parameters of the construction site.Comparing with numerical simulation software, analytical formulas have higher efficiency ensuring certain calculation accuracy as well as the advantages of quickly predicting the structural response of the wind turbine to guide the selection of the wind turbine tower.This article assumes a flexible tower and rigid blades basing on the Wind Power Tower Structure Design Guide.It takes the quasi-steady theory to derive the analytical formula for the mean value of the tower base bending moment of variable pitch control wind turbine.Then taking a 5 MW onshore wind turbine as an example, this paper tested the accuracy by comparing the calculation results of the analytical formulas with that of OpenFAST, checking the applicability of the analytical formula applied to 5 MW wind turbines.The calculation results show that the deformation of blades and towers of large megawatt wind turbines is greatly increased compared with that of small wind turbines, resulting in a certain error in the analytical formula.Finally, based on the reason, a correction method for bending moment analytical formulas was proposed, which can improve its calculation accuracy.
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