Multi Objective Optimization Of Wind Turbine Blade Based On Game Theory

Currently, it is a fact that energy resources shortage are severer and severer.The wind power, as a energy with more mature in using and more advantages on development prospect and development scale, has aroused widespread social concern. As the main form of wind use, wind power generation has got more and more attention and development.The turbine is the core of realization of wind power. The blade is the key part of the Wind turbine. Whether or not of the blade designing directly impacts on the performance of wind turbine and power generation efficiency. So, further study on Wind turbine blade is necessary.Based on the working characteristics of Wind turbine blade, this paper investigates the aerodynamic performance of blade. Meanwhile, momentum-blade element theory was used to establish more standardized analysis model of the aerodynamic performance of wind turbine. Considering on the loss of tip and hub loss correction factor present in the actual operation of the blade, more precise axial and tangential inducible factor were got,which made the computing and force analysis more accurate. Then, The structure design of a 1.5MW wind turbine blades for commercial was done, which included chose of material and design of sectional structure and overlay. The structure of blades was analyzed. And the parametric model of blade was derived by ANSYS. Turbine blade was simulated by shell99 and shell91, and its static strength under limit load was also analyzed.Blade stress and strain distribution were got. In order to avoid the resonance of blade, the modal analysis was carried out and the pictures of top ten order modal ware given. The results show that blade can meet the strength and stiffness requirements and resonance does not happen. Therefore, the model is effective and practical.Besides, multi-objective optimization algorithm based on game theory was introduced and researched in the paper. When the actions of the decision subject interacted with each other, game theory could be used to analyze how to decide and achieve the balance between many subjects. Given the similarity between multi-objective optimization and game theory, So we try to apply the theory and method of game theory to the multi-objective optimization design of wind turbine blades.With the goal of largest annual generation capacity and a minimum quality of wind turbine blade, appropriate blade parameters were chosen. And multi-objective optimization based on NASH equilibrium game theory was used to design the aerodynamic-structure.Firstly, methods were carried out to obtain factors of designed variables which had influences on each objective functions. The policy set division method based on the size of space moment was used to divide policy set by programming. Secondly, the program of game optimizer was written with Matlab and Ansys Apdl. And it was used to design the blade. After optimization, the annual electricity consumption increased by 7.14% and the leaf mass decreased by 12.2%. Not only was the task of multi-objective optimization for blade completed, but the problem of separation between aerodynamic and structural design by traditional design methods was also resolved. It proved that the correctness and efficiency of the proposed optimization methods and lay a theoretical foundation for modern design of turbine blade.