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The Influence of Wind Shear to the Wind Energy Conversion Device Output Character and Research of the Variable Pitch Optimization

Author: HanXue
Tutor: WuYongZhong
School: Inner Mongolia University of Technology
Course: Power Machinery and Engineering
Keywords: Wind shear Pitch angle Variable Pitch Delivered power
CLC: TK83
Type: Master's thesis
Year: 2009
Downloads: 157
Quote: 0
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Abstract


Wind wheel is the key component of the wind turbine, of which the aerodynamic performance directly determines the wind energy extracted from the wind by the wind turbine and the conversion efficiency. The aerodynamic performance of the wind wheel is the core content of wind power technology. However, the wind speed exhibits the wind shear characteristics in space, which leads to the different wind speed on the different horizontal surface swept by the wind turbine blade. The changing wind speed makes the turbine blade operation condition keep changing all the time, which directly influences the aerodynamic performance, and further the efficiency and security of the wind power generation equipments.This paper focused on the impact of wind shear on the output characteristics of the wind energy conversion device. It selected the wind turbine with its capacity of 1.5MW and its wind wheel diameter of 82.7m, and the the blade changeable propeller was studied at the height of the wheel hub in the flow field when the flow speed was the rated speed. The contents included as follows: the aerodynamic characteristics of the wind wheel in the wind shear flow field, the calculation on the pitch angle of the cross-section and the selected optimum pitch angle with the wind wheel blade rotating to any phase angle in the wind shear flow field, and the simulation of the wind wheel output characteristics in the wind shear flow field and so on.In order to achieve the study, this paper is based on the basic theory of wind turbine aerodynamic, establishes the a wind wheel mathematical model of aerodynamic characteristics in a wind shear flow field, then through the software Matlab, programs and calculates the pitch angle of the cross-section preparation when wind wheel rotating blade to any phase angle in a wind shear flow field, and law equation of the pitch angle is observed by the method of polynomial fitting, after selecting the optimized pitch angle, establishes the variable pitch equation when wind wheel turn around a week. In order to verify the impact of the wind shear on the wind energy conversion device output characteristics, respectively simulates the wind wheel output power characters of variable pitch or un-variable pitch when the wheel rotating to any time-invariant phase angle. Through comparing and analyzing the simulation results, hub height wind speed of the flow at rated wind speed, week rotation to blade variable pitch adjustment, which makes the average power output of the wind wheel is about 1492kW, than the rotating blades to any time-invariant phase angle paddle wheel wind higher than average power output of 18kW, the efficiency of the wind wheel enhances 1%, and so that when the leaves rotate to some of the phase rotation angle, the output fluctuations will weaken, reduces the impact of the wind shear on wind energy conversion device. This research provides reference for further large-scale wind turbine variable pitch optimization.

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CLC: > Industrial Technology > Energy and Power Engineering > Wind energy, wind machine > Wind machinery and equipment
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