Novel power curve knee propeller angle optimization method for wind turbine generator unit

Abstract

A novel power curve knee propeller angle optimization method for a wind turbine generator unit comprises the following steps of collecting millisecond-level operation data of the unit; screening out the negative values of the generator rotating speed rates; screening data which meet the requirements that the number of the positive values of the generator rotating speed rates of each wind speed and propeller angle intersection is 100 or above, or the positive values of the generator rotating speed rates of each wind speed and propeller angle intersection are four seconds or above; conducting statistics on the mean value of the positive values of the generator rotating speed change rates in the Bin point range of each wind speed and propeller angle intersection, and drawing a three-dimensional graph of the wind speed, the propeller angle and the generator rotating speed rates; screening the peak value of the generator rotating speed rates; and forming a curve in a fitting mode through the peak value of the generator rotating speed rates, and adjusting the curve fitting type so that the fitted curve can be smooth and can be perpendicular to a generator rotating speed rate contour line. The method overcomes the defects in the prior art, has the advantages of being short in consumed time, more accurate and smoother in optimal propeller angle curve and the like, and can effectively overcome the defects of a traditional strategy.

Description

technical field [0001] The invention relates to the technical field of wind turbine propeller angle optimization, in particular to a novel power curve knee blade angle optimization method for wind turbines. Background technique [0002] With the vigorous development of the domestic wind power market in the past ten years, there are a large number of wind turbines with short rotor diameters in low wind speed areas. Some wind power owners adopt the method of lengthening blades to improve the power generation efficiency of low wind speed wind farms. Among them, the old wind turbines have the characteristics of blade surface wear, dirt, and airfoil data changes caused by the partial lengthening scheme of the blades. In the end, there is a deviation between the actual airfoil data and the theoretical airfoil data of the blade, and it is necessary to optimize the pitch angle optimization strategy of the unit through the measured data. [0003] The traditional pitch angle optimiz...

AI Technical Summary

Problems solved by technology

[0004] Aiming at the deficiencies of the prior art, the present invention provides a novel power curve knee pitch angle optimization method for wind turbines, which overcomes the deficiencies of the prior art and has the advantages of short time consumption, more accurate optimal pitch curve, Smoothness and other advantages can effectively solve the shortcomings of traditional strategies

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