Optimization Method of Wind Turbine Long Flexible Blades Based on Nonlinear Aeroelastic Model
Currently,large wind turbine blades are developing towards greater length and flexibility,making the optimization of their comprehensive aerodynamic and structural performance particularly critical for reducing costs and enhancing efficiency.In this paper,the Euler-Bernoulli beam theory is modified using the variable step deformation difference method for the nonlinear characteristics of long flexible blades.A nonlinear aeroelastic model that considers the simulation accuracy and efficiency is established based on the coupling of the corrected nonlinear structural model and the blade element momentum theory.With the optimization objectives of maximizing the annual power generation of a single machine and minimizing the blade root waving moment,the aerodynamic-structural integration optimization of the DTU 10 MW wind turbine blade was carried out using the non-dominated sorting genetic algorithm-II.The optimization objectives are to maximize annual energy production while minimizing the blade root flapping bending moment.The results indicate that the nonlinear aeroelastic model used as the evaluation function has better overall performance than the linear aeroelastic model used as the evaluation function.The former optimization results can increase the annual energy production and reduce the blade root flapping bending moment.
long flexible bladeoptimized designnonlinearityaeroelastic modelgenetic algorithm
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