Research On Power Curve Test And Evaluation Method For Large Wind Turbine

Wind turbine power curve testing is an indispensable part of wind turbine access system.With the large-scale wind turbines,the effects of wind shear and turbulence on wind speed become more prominent.It is difficult to accurately reflect the whole situation of wind turbines with a single hub height.Secondly,due to the stringent site requirements when installing wind tower in field testing,it is difficult for traditional methods to accurately evaluate wind turbines without wind tower,which makes the applicability of traditional testing methods reduced.Therefore,it is of great practical significance and engineering application value to explore a suitable method for testing and evaluating the power curve of large wind turbines,to study the rotor equivalent wind speed that can accurately represent the whole wind turbine situation,and to study how to test and evaluate the power characteristics of wind turbines without wind tower in wind farms.The main research work is as follows:1.A test method of wind turbine power curve based on the rotor equivalent wind speed of wind turbine is established.A power curve test method based on wind turbine rotor equivalent wind speed is established by using the lidar wind measurement system to obtain the inflow data of the generating unit and simulate the rotor equivalent wind speed of the wind turbine.Combining with an example,the results show that the rotor equivalent wind speed of the wind turbine is closer to the wind speed of the test unit under the actual wind conditions of wind farm operation,and can more accurately reflect the wind speed of the whole wind turbine.The test is more accurate,which verifies the validity and superiority of the proposed method.2.A model of nacelle transfer function based on the rotor equivalent wind speed and nacelle wind speed is established.Based on the in-depth study of the correlation between wind turbine rotor equivalent wind speed and nacelle wind speed,a nacelle transfer function model(Binned-NTF)is established.Combining with an example,the results show that the free flow wind speed at the nacelle is closer to the actual inflow wind speed of the unit,which verifies the validity and feasibility of the model.3.A power characteristic evaluation method of wind turbines based on the rotor equivalent wind speed and nacelle wind speed is proposed.Based on SCADA data and Binned-NTF model,the power characteristics of 10 wind turbines were evaluated and analyzed.A power characteristics evaluation method of wind turbines based on the rotor equivalent wind speed and nacelle wind speed was proposed.Combining with an example,the results show that the evaluation results under free flow wind speed are more accurate and can reflect the real power characteristics of the unit more accurately,which verifies the accuracy and superiority of the proposed method.