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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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Problems solved by technology

[0003] From the above analysis, it can be seen that the wake expansion radius in the Gaussian wake model needs to be determined by empirical formulas. It is generally believed that the model parameters included in the wake expansion radius are related to the flow turbulence intensity, while the wind turbine wake is mainly in the vertical direction. direction and lateral expansion, so it is not reasonable to relate model parameters to flow direction turbulence intensity
In addition, it is very difficult to obtain accurate turbulence intensity in actual wind farms. Errors in calculating turbulence intensity usually lead to inaccurate calculation of model parameters, resulting in inaccurate prediction of wake velocity deficit

Method used

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  • Wake flow calculation method considering local environmental factors of wind power plant
  • Wake flow calculation method considering local environmental factors of wind power plant
  • Wake flow calculation method considering local environmental factors of wind power plant

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Embodiment Construction

[0040] The present invention will be further described in detail with the accompanying drawings and specific embodiments below, which are explanations rather than limitations of the present invention.

[0041] In order to verify the validity of the wake calculation method proposed by the present invention, the wake velocity distribution calculated by this method under different working conditions is compared with the large eddy simulation results reported in the literature and the wind tunnel experimental results, mainly comparing the wake expansion coefficient and velocity deficit distribution under different surface roughness and atmospheric stability conditions. The example data of the comparison of the present invention comes from reference [1].

[0042] The present invention adopts figure 2 The control body shown, in accordance with figure 1 The steps shown build the wake calculation method. exist figure 2 in, U ∞ is the incoming flow velocity, U w is the velocity...

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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.

Description

technical field [0001] The invention belongs to the technical field of wake flow calculation of wind turbines, and in particular relates to a wake calculation method considering local environmental factors of a wind farm. Background technique [0002] At present, the most widely used wind turbine wake calculation method in engineering is the linear wake model developed by Jensen et al. The model is based on the following two assumptions, one is that the width of the wake increases linearly with the distance from the downstream of the wind turbine, and the other is that the velocity in the plane of the wake perpendicular to the axis of the wind turbine is uniformly distributed (Top-hat assumption). Pena et al. compared the Jensen model with the measured data of Sexbierum and the CFD simulation results, and found that there was a large gap between the speed predicted by the Jensen model and the actual situation. They believed that a more advanced wake model should be developed...

Claims

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Application Information

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IPC IPC(8): G06F17/10
CPCG06F17/10Y02E10/72G06F17/11
Inventor 程瑜郭辰邵振州冯军孔金良史俊米磊刘阳李建华鞠景生
Owner HUANENG CLEAN ENERGY RES INST
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