Journal of the Korean Solar Energy Society (한국태양에너지학회 논문집)

The Korean Solar Energy Society (한국태양에너지학회)
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Analysis of Factors Influencing the Measurement Error of Ground-based LiDAR

지상기반 라이다의 측정 오차에 영향을 미치는 요인 분석

  • Kang, Dong-Bum (Multidisciplinary Graduate School Program for Wind Energy, Graduate School, Jeju National University) ;
  • Huh, Jong-Chul (Faculty of Mechanical Engineering, College of Engineering, Jeju National University) ;
  • Ko, Kyung-Nam (Faculty of Wind Energy Engineering, Graduate School, Jeju National University)
  • 강동범 (제주대학교 대학원 풍력특성화협동과정) ;
  • 허종철 (제주대학교 공과대학 기계공학전공) ;
  • 고경남 (제주대학교 대학원 풍력공학부)
  • Received : 2017.06.12
  • Accepted : 2017.12.12
  • Published : 2017.12.30
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Abstract

A study on factors influencing measurement error of Ground-based LiDAR(Light Detection And Ranging) system was conducted in Kimnyeong wind turbine test site on Jeju Island. Three properties of wind including inclined angle, turbulence intensity and power law exponent were taken into account as factors influencing the measurement error of Ground-based LiDAR. In order to calculate LiDAR measurements error, 2.5-month wind speed data collected from LiDAR (WindCube v2) were compared with concurrent data from the anemometer on a nearby 120m-high meteorological mast. In addition, data filtering was performed and its filtering criteria was based on the findings at previous researches. As a result, at 100m above ground level, absolute LiDAR error rate with absolute inclined angle showed 4.58~13.40% and 0.77 of the coefficients of determination, $R^2$. That with turbulence intensity showed 3.58~23.94% and 0.93 of $R^2$ while that with power law exponent showed 4.71~9.53% and 0.41 of $R^2$. Therefore, it was confirmed that the LiDAR measurement error was highly affected by inclined angle and turbulence intensity, while that did not much depend on power law exponent.

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