An optimal design method for low wind speed variable speed and variable pitch wind turbine blades

A wind turbine blade, optimization design technology, applied to the direction of wind turbines, wind turbines, mechanical equipment, etc., which is consistent with the wind direction, can solve the problems of uneven and continuous blade load distribution, difficult processing and manufacturing, etc., to reduce material costs and increase The effect of large annual power generation and reduced blade chord length

Inactive Publication Date: 2018-10-12
CHONGQING UNIV
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Problems solved by technology

The optimal design of blade aerodynamic shape in the above research is only aimed at the main power generation area from the maximum chord length to the blade tip, or although the entire blade length is optimized, the aerodynamic shape of the blade is not represented by a smooth curve, which will lead to Difficulties and problems such as uneven and continuous blade load distribution

Method used

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  • An optimal design method for low wind speed variable speed and variable pitch wind turbine blades
  • An optimal design method for low wind speed variable speed and variable pitch wind turbine blades
  • An optimal design method for low wind speed variable speed and variable pitch wind turbine blades

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Experimental program
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Effect test

Embodiment

[0106] The wind turbine and blade parameters to be designed are shown in the following table:

[0107] Table 1 Optimal Design Parameters

[0108]

[0109] Application such as Image 6 Shown flow process, the CQU-A series airfoil family (thickness is respectively 15,18,20,25,30, 35, 40) are used for a certain 850KW blade according to the relative thickness. In order to make the calculation section truly reflect the chord length and torsion angle distribution and take into account the calculation time, a total of 30 sections are used here to calculate the aerodynamic performance of the blade.

[0110] The pitch angle of the optimized blade is 0.5°, the optimal speed-torque coefficient is 0.090689, and the distribution results of chord length and torsion angle are as follows: Figure 7 and Figure 8 shown. The annual power generation of the blade before optimization is 0.9887×10 13 J, the annual power generation of the optimized blade is 1.0238×10 13 J, increased by 3.6...

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Abstract

The invention relates to a low-wind-speed variable-speed variable-pitch wind turbine blade optimum design method, and belongs to the technical field of wind power generation. According to the low-wind-speed variable-speed variable-pitch wind turbine blade optimum design method, the largest annual energy output and the lowest material cost under the low-wind-speed condition serve as targets, a high order bezier curve is used for defining the chord length and the torsional angle of a blade on the overall length, and optimum control over the best pitch angle and torque-rotating speed is carried out while blade pneumatic shape optimization is carried out. Meanwhile, on the premise that the power generation amount and the lowest material cost are guaranteed, optimal solutions of the chord length and the torsional angle of each cross section of a blade are calculated through an optimization algorithm. The chord length of the wind turbine blade optimized through the method is greatly reduced, the blade area is reduced, the manufacturing material is effectively saved, reduction of the manufacturing cost is facilitates, and meanwhile, the annual energy output is effectively increased.

Description

technical field [0001] The invention relates to the technical field of wind power generation, in particular to an optimal design method for blades of a low-wind speed variable-pitch wind turbine. Background technique [0002] At present, my country's wind power installation areas are mainly concentrated in areas with high wind speed and abundant wind resources such as Xinjiang and Inner Mongolia. But on the one hand, these areas are usually far away from urban areas with high power demand, making power transmission difficult; on the other hand, urban dense areas with low wind speeds continue to increase energy demand. It is understood that currently the area of ​​low wind speed resources that can be used nationwide accounts for about 68% of the national wind energy resource areas, and they are all close to the power load center. The power grid and road network conditions are good, and the electricity price is strong. If they are used, It can largely solve the difficulty of ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F03D1/06G06F17/50
CPCF03D1/0633F05B2260/84G06F30/17Y02E10/72Y02P70/50
Inventor 庞晓平陈进
Owner CHONGQING UNIV
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