Anti-typhoon Optimization Design Of Aerodynamic Configuration Of Wind Turbine Blade Based On Genetic Algorithms

With both good wind resources condition and good consumptive ability of power grid,the wind power industry in southeast coastal area has been developed greatly in recent years.However,the security of local wind farm has drawn much attention due to the frequent occurrence of typhoon in this area.Wind turbine blade is the most likely part which take damages in typhoon,therefore,in order to reduce the aerodynamic load of wind turbine blade during typhoon and raise anti-typhoon capacity of wind turbine blade,the research on the aerodynamic load characteristics of wind turbine blade and extract the characteristic parameter to optimize the design of wind turbine blade according to the special wind condition of area which typhoon occurs frequently has important academic significance and pragmatic value.In this thesis,the wind power coefficient under design condition and distribution characteristics of aerodynamic loads under preset typhoon condition of the conventional wind turbine blade were analyzed,a method of anti-typhoon optimization design of aerodynamic configuration of wind turbine blade is put forward,and the optimum design of a 1.5MW wind turbine blade based on genetic algorithm was carried out.The main work includes:(1)Based on traditional design method,an optimum design for 1.5MW wind turbine blade is carried out,the wind power coefficient under design condition and distribution characteristics of aerodynamic loads along spanwise under preset typhoon condition of the blade were also analyzed,and the shear force on the root of the blade is found to change significantly,which provides the theoretical support for putting forward the method of anti-typhoon optimization design of aerodynamic configuration of wind turbine blade.(2)Based on the blade element momentum and multiple-objective optimization method,by using wind power coefficient at the design condition and shear force of flapwise of the root of wind turbine blade under extreme wind condition as optimization objective,and points of control of bezier curve of chord length and twist angle as variables,the anti-typhoon optimization design model of aerodynamic configuration of wind turbine blade is put forward.(3)Based on the Matlab software platform,by using genetic algorithm asoptimization method,the optimizer is written,and the optimization design of 1.5MW wind turbine blade has been completed.The results show that the power coefficient of optimization of the blade declines only 1.49 percent to 0.4818,which is high enough for wind farm.The optimization of the blade can achieve a better effect on reduction of load during typhoon.Among that,the bending moment decreased 16.31 percent in flapping and 34.93 percent in shimmy,and the shear force decreased 18.84 percent in flapping and 28.89 percent in shimmy.