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Wind wheel equivalent wind speed calculation method considering wind shear and tower shadow effect

A technology of equivalent wind speed and calculation method, applied in the field of effective wind speed calculation, can solve the problems of not considering the operating characteristics of wind turbines, and unable to match the actual power control effects of wind turbines.

Pending Publication Date: 2021-06-11
NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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Problems solved by technology

However, the existing wind turbine equivalent wind speed calculation model based on momentum flux theory and equivalent torque does not consider the operating characteristics of the wind turbine, and cannot match the actual power control effect of the wind turbine, thus ignoring the actual power control deviation caused by power loss

Method used

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  • Wind wheel equivalent wind speed calculation method considering wind shear and tower shadow effect
  • Wind wheel equivalent wind speed calculation method considering wind shear and tower shadow effect
  • Wind wheel equivalent wind speed calculation method considering wind shear and tower shadow effect

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Embodiment Construction

[0085] The present invention proposes a method for calculating the equivalent wind speed of a wind rotor that takes into account wind shear and tower shadow effects. The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0086] figure 1 Flowchart for calculating equivalent wind speed of wind rotor based on equivalent power considering wind shear and tower shadow effect. The calculation method of the equivalent wind speed of the wind wheel based on the equivalent power, which takes into account the wind shear and the tower shadow effect proposed by the present invention, the specific steps of mathematical model construction are as follows:

[0087] (1) Calculation model of wind shear effect

[0088] The wind shear effect is usually described by an exponential model:

[0089]

[0090] In the formula, V Z is the average wind speed at the height Z from the ground; V H is the average wind speed at the h...

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Abstract

The invention discloses a wind wheel equivalent wind speed calculation method considering wind shear and a tower shadow effect, and belongs to the technical field of wind power generation. The method comprises the following steps: step 1, establishing a wind shear effect calculation model; 2, establishing a tower shadow effect calculation model; 3, establishing a wind shear and tower shadow effect joint calculation model according to the models in the step 1 and the step 2; and 4, based on an equivalent power principle, comprehensively considering wind shear, a tower shadow effect and operation characteristics of a wind turbine generator, constructing a wind wheel equivalent wind speed mathematical model based on equivalent power and considering the wind shear and the tower shadow effect, and calculating a wind wheel instantaneous equivalent wind speed and a wind wheel average equivalent wind speed. The method provided by the invention covers the power loss caused by actual power control deviation, can effectively reflect the change rule of the equivalent wind speed of the wind wheel under different power control stages and actual control effects, and is more in line with the actual operation characteristics of the wind turbine generator.

Description

technical field [0001] The invention relates to the technical field of wind power generation, in particular to a method for calculating the equivalent wind speed of a wind rotor in consideration of wind shear and tower shadow effects. Background technique [0002] With the maturity of modern wind power generation technology, wind turbines are developing towards large-scale and low-wind-speed types. The diameter of the wind rotor and the height of the tower continue to increase. The sweeping plane of the wind rotor caused by wind shear and tower shadow effect The inhomogeneity of the spatial distribution of internal wind speed is more obvious and cannot be ignored. The wind speed at the height of the hub can no longer represent the wind speed effect in the sweeping plane of the entire wind rotor, and the equivalent wind speed of the wind rotor taking into account the wind shear and the tower shadow effect should be used. However, the existing wind turbine equivalent wind spe...

Claims

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Application Information

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IPC IPC(8): G06F30/20G06F17/18
CPCG06F30/20G06F17/18Y02E10/72
Inventor 刘永前乔延辉韩爽李莉阎洁孟航
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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