A method for measuring the full-time efficiency of a wind turbine

Abstract

A method for measuring the full-time efficiency of a wind turbine, the steps are: select a wind field and set up a wind speed acquisition instrument, collect the natural wind speed every 3 seconds and continue to collect, the total time of wind speed collection is not less than 15 days; extract the wind speed Collect the total wind speed data within the total duration, the extraction interval is 0.5m / s, and the error range of the extracted wind speed is ±0.2m / s; the cumulative duration t of each level of wind speed is summarized, and the total duration of wind speed collection is recorded as T, and the formula K= t / T calculates the weighting coefficient K of each level of wind speed; builds an experimental device for the aerodynamic performance of the wind turbine in the open wind tunnel, and carries out the blowing experiment. Formula η=P / (0.5·ρv 3 A) 100%, calculate the wind energy utilization efficiency η of the wind turbine under each level of wind speed; multiply the wind energy utilization efficiency η of the wind turbine under each level of wind speed with the weighting coefficient K, and obtain the duration efficiency η' under each level of wind speed; Add all the time-length efficiencies η' to get 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...

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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