Wind Field Characteristic And Pitch Control Of Concentrated Wind Energy Turbine

With the growing energy need of human beings, the problems of energy crisis and environmental pollution are keeping deteriorating. Comparing to traditional fossil energy, wind power is an effective measure to balance the progress of human and protection of environment. Wind power has being an important portion of power grid, following rapid development of wind power technology and increasing of installed capacity. Recent research of wind power technology focus on large wind turbine, turning to large scale constantly.applied to the districts, where are abundant in wind energy. However, there are few research on the middle and little wind turbines applied to the districts, where have no abundance wind energy, lower electric load and defective power grid development.Within existing middle and little wind turbines, concentrated wind energy turbine could improve density of wind energy, reduce turbulence, make use of low quality wind by concentrated wind energy device. To improve the performance of concentrated wind energy turbine further, depend on existing achievement, the paper has accomplished the following research.Analysis various models of wind turbines. Referenced traditional wind model of wind power, combined with the existing research results of concentrated wind device. Establish a coordinate system with the condition of uniform flow. Based on the research of the wind speed distribution, capture wind speed data at different flow velocity and different location. Get the annular distribution wind speed model by processing data.On the basic of design requirement, the paper design one kind of blade consists of S833, S834, S35 airfoil for 900mm diameter rotor, selecting blades designed by National Renewable Energy Laboratory.Study on design method of various pitch control, analysis every kind of load involved into process of various pitch control, contrast different drive mode of various pitch. Import wind model and blade data obtained before into Bladed, putting the annular wind model as the wind speed input of control system and the power output of wind turbine as controlled quantity, to conduct various pitch control. The result of control is satisfying by amend controls parameter.