Wind turbine full-time efficiency measuring method

Abstract

The invention relates to a wind turbine full-time efficiency measuring method. The method comprises the steps that a wind field is selected, a wind speed collecting instrument is erected, the wind speed of natural wind is collected once every three seconds and continuously collected, and the total wind speed collecting time is not shorter than 15 days; total wind speed data in the total wind speedcollecting time length are extracted, wherein the extraction interval is 0.5 m / s, and the extraction wind speed error range of + / -0.2 m / s; the wind speed cumulative duration t of each stage is summarized, the total wind speed collecting duration is recorded as T, and a wind speed weighting coefficient K of each stage is calculated according to a formula K=t / T; a wind turbine aerodynamic performance experiment device is built in an open wind tunnel, an air blowing experiment is carried out, the experiment wind speed is applied according to the full-stage wind speed, the power P of a wind turbine at each stage of wind speed is measured, and the wind energy utilization efficiency eta of the wind turbine at each stage of wind speed is calculated through the formula eta=P / (0.5.rhov<3>A).100%;the wind energy utilization efficiency eta of the wind turbine at each stage of wind speed is multiplied by the weighting coefficient K to obtain duration efficiency eta' at each stage of wind speed;and all the duration efficiencies eta' are added to obtain the full-time efficiency of the wind turbine.

Description

technical field [0001] The invention belongs to the technical field of wind turbine performance experiments, in particular to a method for measuring the full-time efficiency of wind turbines. Background technique [0002] At present, according to the different forms of wind energy utilization, wind turbines can be divided into lift-type wind turbines, drag-type wind turbines and lift-drag hybrid wind turbines, but no matter which type of wind turbine is designed according to the rated wind speed, This has resulted in an unavoidable result, that is, only when the natural wind reaches the rated wind speed, the design performance parameters of the wind turbine can be achieved. However, the natural wind is never constant, but variable and irregular. Therefore, the performance parameters of the wind turbine at the rated wind speed cannot represent the real performance of the wind turbine, nor can it accurately calculate the power generation of the wind turbine, resulting in Fans...

AI Technical Summary

Problems solved by technology

[0002] At present, according to the different forms of wind energy utilization, wind turbines can be divided into lift-type wind turbines, drag-type wind turbines and lift-drag hybrid wind turbines, but no matter which type of wind turbine is designed according to the rated wind speed, This has resulted in an unavoidable result, that is, only when the natural wind reaches the rated wind speed, the design performance parameters of the wind turbine can reach

However, the natural wind is never constant, but variable and irregular. Therefore, the performance parameters of the wind turbine at the rated wind speed cannot represent the real performance of the wind turbine, nor can it accurately calculate the power generation of the wind turbine, resulting in Fans with excellent performance cannot meet the design performance in places where the natural wind conditions are not suitable