A wind farm wake correction method and system based on CFD fluid mechanics model

Abstract

The invention discloses a wind farm wake correction method and system based on a CFD fluid mechanics model. The wind farm is divided into sectors with theta degree as one wind direction, and the windfield wake flow field is calculated by using the wind direction rotation model, which includes: according to the wind direction data of the wind measuring tower, the numerical simulation model extending along the X-axis direction according to the wind direction is established, and the grid three-dimensional solid model of the wind farm topography is established; based on the CFD wake model of theReynolds mean Nav i er-Stokes equation, the wake field in the main wind direction sector is obtained; by deflecting the terrain coordinates, the wake flow fields in other sectors with different wind directions are calculated; the wake flow fields are weighted by the wind frequencies in different wind direction sectors, and the final wake flow fields are obtained, which are used to calculate the wake effects between wind turbines. By adding topographic coordinate deflection, the invention adapts to numerical simulation of CFD fluid mechanics wake model with different wind direction angles, andat the same time, the wind frequency of each wind direction is considered for weighting, so that the wake region is more consistent with the real flow field.

Description

technical field [0001] The invention relates to the field of optimal control of wind farms, in particular to a method and system for correcting wake flow of wind farms based on a CFD fluid dynamics model. Background technique [0002] The proportion of wind power generation in the power system continues to increase, and large wind farms usually consist of hundreds or even thousands of wind turbines. The wake of the wind turbine in the wind farm has a great influence on the downstream wind turbine, and the calculation of the wake of the wind turbine has attracted more and more attention. In the wake area, the spacing between different wind turbines, the terrain characteristics of the wind farm, and the wind characteristics will all affect the wake assessment. Therefore, it is necessary to accurately assess the wind turbines affected by the wake. [0003] There are usually two methods for studying the wake effect of wind turbines. One is the Park, Jansen and other wake model...

AI Technical Summary

Problems solved by technology

[0004] It can be seen that the above-mentioned existing wind farm wake calculation method obviously still has inconvenience and defects, and needs to be further improved.

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