Research On The Wind Speed Distribution Characteristics For The Swept Surface Of The Impeller Of The Wind Turbine

Wind speed is an important factor affecting the output characteristics of the fan.It is of great significance to obtain high fitting accuracy wind speed model for fault prediction diagnosis and performance evaluation of wind power generation system.In this paper,Matlab / Simulink is used as the main research and analysis tool.The dynamic output characteristics of direct drive permanent magnet wind turbine(D-PMSG)under different wind speed components are studied,and the spatial distribution characteristics of wind speed under the whole impeller swept surface are obtained.This paper provides some reference for the further study of the operation characteristics of the fan under the natural wind speed.The main contents of this paper include:1.Refer to relevant literature,introduce the research status and development trend of fan and wind speed simulation.Three common wind speed models are simulated,and the advantages and disadvantages of these models are compared.2.Discuss the theoretical content and mathematical derivation of this topic.In this paper,based on the Kaimal turbulent wind speed,considering the effects of wind shear,tower shadow effect and impeller rotation,a dynamic model of wind speed on the whole swept surface of the wind turbine is established.3.The time-space variation of wind speed under the action of wind shear and tower shadow effect is simulated by MATLAB.The influence curves of wind speed related parameters such as hub center height,tower diameter and blade overhang distance are studied.It shows that different parameters have different effects on wind speed model.4.The D-PMSG is modeled by Simulink,and the wind speed model is imported into the fan model for characteristic analysis.The effects of natural wind speed,step change wind speed and equivalent wind speed of wind shear and tower shadow effect on the output characteristics of wind turbine are analyzed.The current and voltage signals of grid side that meet the requirements are obtained by simulation.The results show that the wind shear and tower shadow effect can restrain the output of t he fan,and the sudden change of the wind speed will lead to the drastic change of the output.