Blade Design And Optimization Of Offshore Wind Turbine Based On Pso

With abundant offshore wind resources and high utilization hours,offshore wind turbine has been becoming the dominant direction for wind power development in the future.The blade is the core part of the wind turbine.The blade shape design plays a decisive role in improving the power generation efficiency of the wind turbine.The blade profile design involves many disciplines,such as aerodynamics,structural dynamics and multi-parameter optimization.For offshore floating wind turbines,the wave will cause the floating platform to move and cause the relative wind speed of the wind turbine to change,and accordingly the aerodynamic performance of the wind turbine will also change.On the other hand,offshore floating Wind turbine,the blade design needs to consider the site of the sea conditions.Therefore,it is of great theoretical and practical significance to study the rotor blades and their design methods suitable for different sea conditions.First of all,the present situation of offshore wind turbine development is introduced.The status quo of offshore floating wind turbine system technology and fluid dynamic theory of offshore wind turbine are introduced emphatically.The basic theory of wind turbine aerodynamics,geometrical parameters of wind turbine,performance parameters of wind turbine,Sheath momentum theory and wave theory.Secondly,FAST,a wind turbine simulation software developed by the US National Energy Laboratory,is introduced to optimize the design parameters of floating wind turbines based on NREL 5MW_OC3Hywind.The main input parameters for the performance calculation of floating offshore wind turbines are given.Based on the FAST software The time-domain model of wind turbine-floating foundation-mooring system is established.Then,on the basis of expatiating the principle and realization process of Particle Swarm Optimization(PSO),a wind turbine blade optimization program is compiled based on particle swarm optimization algorithm.In order to realize the interaction between FAST software and the optimization program of wind turbine blade,,FAST Matlab Simulation interface,the FAST embedded in the wind turbine blade optimization program to maximize the generator output power optimization goals,to achieve automatic optimization of the aerodynamic shape of the wind turbine blades.In order to verify the feasibility of the optimized design procedure,the fixed-type wind turbine NREL 5MW is used as the optimized female model,and the low wind speed(6m/s)and the rated wind speed(11.4m/s)Wind speed(6m/s),the optimized wind turbine power increased by 1.5%.Finally,the change of aerodynamic performance caused by the swaying motion of SPARtype floating wind turbine under the action of waves is studied.The influence of the flow on the aerodynamic performance of the wind turbine is obtained through the study of inductive calculation results.Based on NREL 5MW_OC3Hywind model,three kinds of typical sea conditions were selected to optimize the wind turbine blade design under the condition of sea conditions.The torsional distribution and chord length distribution of the blades were obtained.The results showed that the output power increased by about 1%-2%.The result of the optimization is satisfying.At the same time,the validity of the method and procedure for offshore wind turbine blade optimization is verified.The results of this paper provide some experience for the design of offshore floating wind turbine blade in the future.