Wind farm turbulence intensity processing method and system

Abstract

The invention discloses a method and system for processing a turbulence intensity of a wind power farm. The method comprises the following steps: performing pretreatment on wind measurement data, a landform and a coordinate system of the wind power farm, and forming input data of a standard format; performing calculation according to the input data, and obtaining turbulence information of each point location within the wind power farm range through calculation by the wind measurement data of a plurality of (greater than or equal to one) wind measuring point locations; performing analysis and extraction of a turbulence intensity matrix on a concerned point location according to the turbulence information; drawing a turbulence-wind speed curve I according to the extracted turbulence intensity matrix, setting one turbulence intensity reference value, and drawing a turbulence-wind speed curve II within an effective wind speed section according to a normal turbulence model; and performing exhaustion on the turbulence intensity reference value until the turbulence-wind speed curve I is coincided approximately with the turbulence-wind speed curve II, marking the turbulence intensity reference value at this time, that is a turbulence intensity expected value Iref of the point location. The method and the system for processing the turbulence intensity of the wind power farm provided by the invention can effectively, quickly and accurately acquire the turbulence intensity value in the wind power farm, and are matched with the new standard requirement of the current wind turbine generation set design.

Description

technical field [0001] The invention relates to the field of wind power generation, in particular to a method and system for processing turbulence intensity in wind farms. Background technique [0002] Turbulence intensity is a key index used to evaluate wind speed fluctuations, an important parameter in wind energy resource assessment of wind farms, and one of the main basis for wind turbine design and selection. In the development of wind power projects, selecting the appropriate model and ensuring the safety of the unit are the main factors affecting the income of the wind farm. Among them, the turbulence intensity is a very important parameter for the selection of the unit and the safety assessment, especially for wind power in mountainous areas with complex terrain. field is particularly prominent. Turbulence intensity is closely related to the characteristics of wind energy resources, terrain, landform, obstacles and other factors. In the design of wind farms, the tur...

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Problems solved by technology

[0004] Due to the different definitions of the above two turbulence intensities, they cannot be used as substitutes in calculations, and the existing technology cannot be quantitatively compared with the turbulence intensity classification categories specified in the IEC61400-1 standard, which can easily lead to wind turbine selection. error or safety risk

At present, the expected value of turbulence intensity I at each point of the wind farm is obtained ref There is no mature and universal method, and the commonly used wind resource calculation software can only provide representative values ​​(eigenvalues) of turbulence intensity I 15 , which will inevitably cause the input conditions in the actual selection process of the wind turbine in the electric field to not match the criteria, as well as the inaccuracy of the load check calculation input, which poses a greater safety risk

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