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Method for evaluating wind power plant wind energy resources through Globcover land covering data

A land cover and wind farm technology, which is applied in the field of using Globcover land cover data to evaluate wind energy resources in wind farms, can solve the problems of wind energy resource evaluation errors in wind farms, distorted surface roughness distribution, and no results, and achieves the distribution of surface roughness. The effect of real situation, high overall accuracy and long observation period

Inactive Publication Date: 2014-11-26
CHINA THREE GORGES CORPORATION
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Problems solved by technology

[0004] The disadvantage of the existing assessment technology for wind energy resources in wind farms is that it can only be applied to small wind farms with flat terrain and uniform terrain.
For large-scale wind farms with rugged terrain and changing landforms, due to the constraints of time, cost, energy, equipment and other factors on site survey work, the scope of survey is greatly limited and cannot cover the entire site. It is incomplete, and cannot fully and completely reflect the topography of the entire site. Based on this, the estimated surface roughness distribution of the site will also be distorted to a certain extent, and it will eventually be used in wind farm wind energy resource assessment. large error
[0005] At present, there are no relevant results in the use of Globcover land cover data to assess wind energy resources of wind farms

Method used

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  • Method for evaluating wind power plant wind energy resources through Globcover land covering data
  • Method for evaluating wind power plant wind energy resources through Globcover land covering data
  • Method for evaluating wind power plant wind energy resources through Globcover land covering data

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[0056] Step 1. For the distribution map of Globcover land cover type of Siziwang Wind Farm in Inner Mongolia, see figure 2 , In terms of "crops (50%~70%) / vegetation (grassland, shrubs, forest) (20%~50%)" (number 20), "vegetation (grassland, shrubs, woodland) (50%~70%) / Crop (20%-50%)" (No. 30), "Canopy closed to open (> 15%) grassland" (No. 140), "Sparse (> 15%) vegetation (woody vegetation, shrubs, grassland)" ( No. 150) and "bare land" (No. 200) are the main types.

[0057] Step 2. The Globcover land cover type distribution map of Siziwang Wind Farm is converted to the surface roughness distribution map, see image 3 There are four levels of surface roughness, ranging from 0.0024m to 0.1m.

[0058] Step 3: Since Siziwang Wind Farm has three wind measurement towers (3954#, 3961# and 3962#), the wind resource assessment software meteordyn WT is used as a reference tower for the actual measurement of a wind measurement tower, and its wind data Perform extrapolation simulation to o...

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Abstract

A method for evaluating wind power plant wind energy resources through Globcover land covering data comprises the main steps of drawing a Globcover land covering type distribution diagram of a wind power plant, converting the land covering type distribution diagram into a land surface roughness distribution diagram, using wind resource evaluating software to extrapolate and simulate wind condition data of a site, evaluating the annual average wind speed and Weibull distribution parameters of a wind turbine generator and estimating the annual electric energy output of the wind turbine generator. Compared with the prior art, the Globcover land covering data are made and finished by satellite image data. Thus, the method has the advantages of being wide in coverage, long in observing period, high in total accuracy and capable of comprehensively and completely obtaining the land covering type situation in a range of the site of the wind turbine generator. In addition, the estimated land surface roughness distribution situation is real and more accurate. Furthermore, the method is smaller in error and higher in accuracy when being applied to evaluating the wind power plant wind energy resources.

Description

Technical field [0001] The invention relates to a method for evaluating wind energy resources of a wind farm, in particular to a method for evaluating wind energy resources of a wind farm by using Globcover land cover data. Background technique [0002] Surface roughness is an important parameter in boundary layer meteorology. According to the definition of aerodynamics, the surface roughness refers to the height at which the wind speed near the ground decreases to zero. In the field of wind energy resource assessment of wind farms, the “land type classification method” is commonly used to estimate the surface roughness, that is, the corresponding relationship of different surface roughness is divided according to different land cover types. According to the "European Wind Energy Atlas Scheme", the land cover types are divided into 9 different types, including water surface, grassland, farmland, forest, and city, and the corresponding surface roughness ranges from 0.0002 to 1.6m...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06Q50/06
Inventor 张双益王益群吕宙安张继立
Owner CHINA THREE GORGES CORPORATION
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