Wake flow calculation method considering local environmental factors of wind power plant
A technology of environmental factors and calculation methods, applied in wind power generation, complex mathematical operations, etc., can solve problems such as inaccurate calculation of model parameters, difficulty in obtaining turbulence intensity, unreasonable correlation between model parameters and flow direction turbulence intensity, etc., to improve accuracy , the effect of expanding the scope of application
Active Publication Date: 2021-03-02
HUANENG CLEAN ENERGY RES INST +1
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Abstract
The invention discloses a wake flow calculation method considering local environmental factors of a wind power plant, and belongs to the technical field of wind turbine generator wake flow calculation. Firstly, local environment parameters of a wind power plant are obtained according to the local environment of the wind power plant, then an atmospheric stability function of the environment where the wind power plant is located is calculated, the obtained atmospheric stability function serves as input, and the earth surface friction speed is calculated through the MoninObukhov similarity theory. Then sequentially calculating to obtain the flow velocity pulsation of the near-stratum, the flow turbulence intensity of the near-stratum and the spanwise turbulence intensity of the near-stratum,and establishing a direct proportion relationship between the spanwise turbulence intensity of the hub height and the spanwise turbulence intensity of the near-stratum to obtain the spanwise turbulence intensity of the hub height; sequentially calculating to obtain a wake flow expansion coefficient, an initial wake flow radius and a wake flow radius, calculating a wake flow region speed loss thickness, and finally obtaining the speed distribution of the wake flow region. According to the method, the application range of the wake flow calculation method is greatly expanded, and the accuracy ofa calculation result is improved.
Application Domain
Wind energy generationComplex mathematical operations
Technology Topic
MeteorologySimilarity theory +3
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