Method, data processing device and radar for wake detection

Abstract

The invention discloses a wake detection method, which comprises the following steps: a laser emitting step; a signal processing step; a data processing step: extracting the position of the Doppler signal to obtain the frequency f of the two laser beams 1 , f 2 ; and identify the spectral width w of each frame echo signal 1 、w 2 ; Wind speed calculation steps: based on the frequency f of the two laser beams 1 , f 2 Calculation of radial wind speed calculation, turbulence intensity; threshold discrimination step: based on the spectral width of each frame echo signal to detect whether there is a wake in the upstream fan. The invention can conveniently and simply identify the existence of the wake, and at the same time, the data processing process is simple and the application cost is low, and by optimizing the laser radar device, the wake at different distances can be identified to obtain the wake in the horizontal distance Therefore, it can be indirectly applied to the wind field information measurement requirements, avoiding the simplification of applications.

Description

technical field [0001] The invention relates to the field of radar measurement, in particular to a wake detection method, a data processing device and a radar. Background technique [0002] The optimal layout of wind turbines in wind farms is a key link in wind farm planning, and one of the main factors to determine the relative positions of wind turbines in the wind farm is the wake effect between wind turbines. Optimal wind farm design can minimize the effects of wake turbulence, but cannot completely avoid it. Therefore, wind field wake prediction is of great significance to wind field owners, which can reduce costs and extend the life of wind turbines. [0003] Most of the wake recognition methods nowadays, such as CN 109973330 A: A method for detecting the influence of the upstream fan wake on the downstream fan. The method includes: a detection method for judging the sector and degree of influence of the upstream fan wake on the downstream fan, using a continuous wav...

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Problems solved by technology

[0005] 1. It is necessary to combine the wind vane on the engine room with the laser wind radar, and determine the wake and wake strength by comparing the wind direction deviation and amplitude of the two sensors. The data processing of this method is not only complicated, but also costly

[0006] 2. Use continuous wave laser radar to identify the wake. Since the continuous wave laser radar can only identify the wake at a certain point each time, it is impossible to identify each distance between the upstream fan and the downstream fan at the same time. Effective assessment of the range of influence of wind flow on downstream wind turbines cannot provide effective help for the optimal layout of wind farms

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