Method for evaluating extreme coherent gust amplitude of wind direction change, and wind direction change value

A technology of changing value and wind direction, applied in the field of wind resource assessment, can solve problems such as unit life reduction and tower collapse accident, and achieve the effect of high profit return, easy operation and convenient acquisition

Active Publication Date: 2021-06-01
ZHEJIANG WINDEY
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Problems solved by technology

[0004] The present invention aims to overcome the problems of unit life reduction and tower collapse accidents caused by inaccurate fan load assessment in the prior art, and provides a method for evaluating the extreme coherent gust amplitude and wind direction change value of wind direction changes, so as to improve the extreme coherence of the site Accuracy of wind gust assessment, thereby improving the reliability of safe operation of wind turbines

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  • Method for evaluating extreme coherent gust amplitude of wind direction change, and wind direction change value
  • Method for evaluating extreme coherent gust amplitude of wind direction change, and wind direction change value
  • Method for evaluating extreme coherent gust amplitude of wind direction change, and wind direction change value

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Embodiment Construction

[0025] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0026] This embodiment provides a method for evaluating the extreme coherent gust amplitude and wind direction change value of wind direction change, such as figure 1 shown, including the following steps:

[0027] S1. Obtain the wind measurement data samples of the site for a long period of time. At least one year of continuous wind measurement sample data is required, and the wind speed and wind direction time series shall be sorted and edited.

[0028] S2, ITM method data editing, screen the difference data of wind speed and wind direction with equal time interval Δt=10s, and re-establish the time series of wind speed variation and wind direction variation;

[0029] Use the GAI judgment function to judge the above two new sequences. If the value is greater than 0.99, it is considered that the wind speed and wind direction changes in this per...

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Abstract

The invention discloses a method for evaluating an extreme coherent gust amplitude of wind direction change, and a wind direction change value. The problems of unit life shortening and tower collapse accidents due to inaccurate evaluation of fan load in the prior art are solved, and the method comprises the following steps of acquiring a long-term wind measurement data sample of a site, identifying wind speed and wind direction data by using a GAI judgment function; determining a gust event meeting requirements in the site sample data, and fitting a calculation relation between a probability function and a theoretical probability through a sample gust amplitude actually measured; obtaining an extreme coherent gust amplitude of site direction change, and conducting Dir function fitting on an average wind speed value and a direction change value of the site gust event; and determining the extreme coherent gust direction change value of the site wind direction change. The method is high in practicability and relatively easy to operate, deeper mining on wind resource evaluation data is performed, and the method is an optimal method which accords with the actual situation of extreme coherent gust of which the direction changes once a site encounters within fifty years.

Description

technical field [0001] The invention relates to the field of wind resource assessment and the field of wind power generator load assessment, in particular to a method for assessing the extreme coherent gust amplitude and wind direction change value of wind direction change. Background technique [0002] Extremely coherent gusts with changing directions pose a great risk to the safe operation of wind turbines. During the load simulation at the design stage of the wind turbine, the dlc1.4 operating condition load corresponding to this wind condition is often the largest load among all operating conditions, especially for the current The simulation results of the prevailing flexible tower are much larger than other working conditions, resulting in the design weight of the tower being too large, and even because the ultimate load of the tower is too large, it cannot meet the design requirements of the tower, resulting in the failure of the flexible tower project plan. Therefore,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F03D17/00G06F30/20
CPCF03D17/00G06F30/20
Inventor 沈铠章培成王瑞良刘为孙勇徐伊丽
Owner ZHEJIANG WINDEY
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