복잡지형에서 4빔 나셀 라이다 측정 데이터의 정확도 평가
Accuracy Assessment of Four-Beam Nacelle LIDAR Measurements in Complex Terrain
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참고문헌
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초록
In order to assess the accuracy of four-beam nacelle light detection and ranging (LIDAR) measurements, a field measurement campaign was carried out in Dongbok wind farm on Jeju Island. The four-beam nacelle LIDAR was set up on the nacelle of a test wind turbine of HJWT 2,000 kW with an 80 m hub height for this investigation. The ground-based LIDAR was situated at three times the rotor diameter of the test wind turbine. First, the ground-based LIDAR measurements were verified by comparing them with neighboring 80-meter-tall met mast wind data. Then, the four-beam nacelle LIDAR measurements were compared with the ground-based LIDAR measurements. The carrier to noise ratio (CNR) variation was analyzed in terms of weather conditions (temperature, pressure, humidity) and mechanical movement (blade rotation, tilt variation of wind turbine). Measurement deviations were also analyzed according to data availability. Based on the analysis results of the characteristics of LIDAR measurements, reliable ground-based and nacelle LIDARs data sets were chosen for linear regression analysis. As a result, it was confirmed that the average CNR signals were higher than the CNR threshold in various weather conditions. The mechanical movement did not cause LIDAR measurement deviation. The correlation between wind data by nacelle and ground-based LIDARs was considerably high with a regression coefficient of 1.01 and coefficient of determination of 0.98.
Abstract
In order to assess the accuracy of four-beam nacelle light detection and ranging (LIDAR) measurements, a field measurement campaign was carried out in Dongbok wind farm on Jeju Island. The four-beam nacelle LIDAR was set up on the nacelle of a test wind turbine of HJWT 2,000 kW with an 80 m hub height for this investigation. The ground-based LIDAR was situated at three times the rotor diameter of the test wind turbine. First, the ground-based LIDAR measurements were verified by comparing them with neighboring 80-meter-tall met mast wind data. Then, the four-beam nacelle LIDAR measurements were compared with the ground-based LIDAR measurements. The carrier to noise ratio (CNR) variation was analyzed in terms of weather conditions (temperature, pressure, humidity) and mechanical movement (blade rotation, tilt variation of wind turbine). Measurement deviations were also analyzed according to data availability. Based on the analysis results of the characteristics of LIDAR measurements, reliable ground-based and nacelle LIDARs data sets were chosen for linear regression analysis. As a result, it was confirmed that the average CNR signals were higher than the CNR threshold in various weather conditions. The mechanical movement did not cause LIDAR measurement deviation. The correlation between wind data by nacelle and ground-based LIDARs was considerably high with a regression coefficient of 1.01 and coefficient of determination of 0.98.
참고문헌 (12)
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