Aerodynamic and Structural Optimization Design of Wind Turbine Blade Based on Decision Method of Competition Game

Aerodynamic model, structural model and finite element model of wind turbine blade were established. Taking 27 design parameters, including chord length and torsion angle of seven standard airfoils, layer number, layer location, location of shear web and width of spar cap etc, as design variables, and considering the aerodynamic and structural performance of wind turbine blade, a multi-objective optimization model of the wind turbine blade was built by taking annual energy production and mass of the blade as the objective functions, and taking strength, stiffness and stability constraints of the blade into account. Decision method of competition game was employed to solve the case of the actual blade example, where aerodynamic objective and structure objective were regarded as two game players, and fuzzy clustering was used to split the design variables set to the strategy subspace of each game player. Each player took its own profit function as mono-objective, and optimized it in each strategy subspace. According to convergence criterion, the final game equilibrium solution was obtained through multiround game. The results show that the blade parameters obtained by competition game are more reasonable, not only the blade mass is reduced, but also the annual energy production is increased, which demonstrates the effectiveness of this method.