Method for accurately solving wind turbine blade echoes

A wind turbine and blade technology, which is applied in the engineering field of radar-side wind turbine blade echo filtering, can solve problems such as difficulty in simulating blade echoes, constraints, and uneven scattering intensity of blade scattering points, so as to avoid coordinate pairing problems. , increase the amount of calculation, solve the effect of passive interference

Active Publication Date: 2019-04-02
CHINA THREE GORGES UNIV
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Problems solved by technology

However, according to the electromagnetic scattering theory in the high-frequency region, the scattering intensity of blade scattering points is not equal, and the geometric spacing of adjacent scattering points is limited by the radar

Method used

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  • Method for accurately solving wind turbine blade echoes
  • Method for accurately solving wind turbine blade echoes
  • Method for accurately solving wind turbine blade echoes

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Embodiment

[0079] Select the Goldwind 77 / 1500 wind turbine, and build a wind turbine blade model of the same size as figure 2 As shown, the blade echo solution analysis is carried out. Let the initial position of the first blade be parallel to the positive direction of the y-axis, clockwise to be the second and third blades respectively, the length of each blade is 35m, and the blade speed is 20r / min. Set the distance between the radar and the blade axis to 10km, the initial frequency of the radar signal is 2.744GHz, and the bandwidth is 512MHz, then the center frequency of the radar signal is 3GHz, and the number of frequency sampling points is set to 151; set the azimuth of the radar signal to 90 degrees, the initial pitch angle is 88°, and the rotation angle is set to 4°, then the pitch angle of the observation center of the radar signal is 90°, and the number of angle sampling points is set to 101; the pulse repetition frequency is set to 4000Hz, and the observation time is set to 3...

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Abstract

A method for accurately solving wind turbine blade echoes is provided, in order to obtain accurate blade echoes. The method mainly comprises three parts: firstly, solving two-dimensional backscattering field data of wind turbine blades within a range of a certain frequency band and a certain corner angle; secondly, according to the obtained two-dimensional backscattering field data of the blades,calculating an autocorrelation covariance matrix, and solving electromagnetic scattering electric field amplitudes and space coordinate parameters of the blades; and thirdly, establishing a blade equivalent model according to the obtained electric field amplitudes and space coordinate parameters, and deriving an equivalent model-based blade echo expression, so as to solve the blade echoes. The method provided by the present invention can be used to accurately solve the blade echoes and to realize the blade echo filtering on the radar side in actual engineering, and has significance to solve the passive interference of the wind turbine to the adjacent radar station.

Description

technical field [0001] The invention relates to a method for accurately solving the echo of a wind motor blade, and belongs to the engineering field of filtering the echo of a radar side wind motor blade. Background technique [0002] The increasing number of wind farms has caused an increasingly prominent problem of passive interference to adjacent radar stations. In particular, the rotating blades of the wind turbine scatter radar echoes with micro-Doppler characteristics to the external space under the excitation of radar incident electromagnetic waves, resulting in the shadowing effect of radar targets near the blade echo units. At present, researchers are more inclined to filter blade echoes on the radar side according to the micro-Doppler characteristics of blade echoes. Therefore, accurately calculating the radar echo and its micro-Doppler characteristics of wind turbine blades is the key problem to solve the passive interference of wind farms to radar stations. [...

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Application Information

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IPC IPC(8): G01S7/36G01S13/95
CPCG01S7/36G01S13/958Y02A90/10Y02E10/72
Inventor 唐波陈昊黄力袁发庭陈彬王爽刘映彤黄晨奕
Owner CHINA THREE GORGES UNIV
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