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지영미(Ji, Young-Mi),김현구(Kim, Hyun-Goo),정진화(Chung, Chin-Hwa),한경섭(Han, Kyung-Seop),박현철(Park, Hyun-Chul) 한국신재생에너지학회 2009 한국신재생에너지학회 학술대회논문집 Vol.2009 No.11
The wind speed measurement is performed using SODAR and LIDAR to evaluate availability of remote sensing in assessment of wind resource. The intercomparison comprises time series, correlation analysis and recovery rate. It shows that LIDAR is more effective than using SODAR to measure wind speed in ambient disturbance.
풍력자원평가를 위한 라이다 관측 시 풍속연직분포 불확도 분석
김현구(Kim, Hyun-Goo),최지휘(Choi, Ji-Hwee),장문석(Jang, Moon-Seok),전완호(Jeon, Wan-Ho) 한국신재생에너지학회 2010 한국신재생에너지학회 학술대회논문집 Vol.2010 No.06
원격탐사(remote sensing)란 관측 대상과의 접촉 없이 멀리서 정보를 얻어내는 기술을 말한다. 기상관측분야에는 이미 소다(SODAR) 장비가 폭넓게 사용되거 왔으나 최근 풍력자원평가(wind resource assessment)를 위한 풍황측정에 SODAR와 더불어 라이다(LIDAR)가 적극적으로 활용되기 시작하고 있다. 참고로 SODAR(SOnic Detection And Ranging)는 수직 및 동서 남북 방향으로 음파를 발생시키고 대기유동에 의해 산란 반사된 에코를 수신하여 진동수 변화와 반사에코 강도를 측정하여 각 방향의 에코자료를 벡터 합성함으로써 풍향 및 풍속을 산출하는 원리이다. 반면 LIDAR(Light Detection And Ranging)는 비교적 최근에 풍황측정 용도로 개발된 레이저 탐지에 바탕을 둔 원거리 센서로, 공기입자(먼지, 수증기, 구름, 안개, 오염물질 등)에 의해 산란된 레이저 발산의 도플러 쉬프트(Doppler shift)를 이용하여 풍향 및 풍속을 측정하는 원격탐사 장비이다. 풍력자원평가 측면에서 라이다는 그 정확도가 IEC61400-12에 의거한 풍황탑(met-mast) 측정자료 다수와의 비교검증 실측평가(Albers et al., 2009)를 통하여 입증된 바 있다. 한편 한국에너지기술연구원에서 운용 중인 라이다 시스템은 그림 1의 우측 그림과 같이 1초에 360?를 스캔하여 50지점에서 반사되는 레이저를 스펙트럼으로 측정하되 설정된 관측높이에서 풍속은 샘플링 부피(sampling volume)의 평균값으로 정의된다. 그런데 샘플링 부피는 설정된 관측높이로부터 상하 12.5m, 총 25m의 높이구간에서 관측한 스펙트럼의 평균값을 그 중앙지점에서의 풍속으로 환산하는 알고리듬(algorithm)을 채택하고 있다. 따라서 비선형적으로 변화하는 풍속연직분포 관측 시 풍속환산 알고리듬에 의한 측정오차가 개입될 가능성이 존재하는 것이다. 이에 본 연구에서는 라이다에 의한 풍속연직분포 측정 시 샘플링 부피의 구간 평균화 과정에서 발생하는 불확도(uncertainty)를 정량적으로 분석함으로써 라이다에 의한 풍속연직분포 관측의 불확도를 정량평가하고자 한다.
SODAR관측을 통해 분석한 도심지 상층의 풍력자원 특성
이화운(Lee, Hwa-Woon),박순영(Park, Soon-Young),김동혁(Kim, Dong-Hyuk),전원배(Jeon, Won-Bae),차영민(Cha, Yeong-Min),김현구(Kim, Hyun-Goo) 한국신재생에너지학회 2009 한국신재생에너지학회 학술대회논문집 Vol.2009 No.06
When we urgently need to develop and supply an alternative energy, wind power is growing with much interest because it has relative low cost of power and area of tower. To estimate the wind power resource, it is necessary to make an observation first. Although the large wind falm and resources are near coast and mountain area, the wind energy in urban area has the strong thing of direct access to power generator. In this study, we estimate the probability of wind energy above urban area using SODAR data, which is located at the top of the tall building (140m).
풍력자원평가용 윈드큐브 라이다와 메텍 소다의 비교·검증 - 김제평야 원격탐사 캠페인
김현구,조강표,안해준,전완호 한국풍공학회 2012 한국풍공학회지 Vol.16 No.1
The technical trend of wind resource measurement in Europe and North America is employing a ground-based remote sensing such as LIDAR or SODAR in addition to a meteorological tower to reduce measurement uncertainty. This paper presents uncertainty assessment of Leosphere WindCube LIDAR and Metek PCS.2000-64 SODAR through a mutual comparison from a field campaign at Gimje Plane. Compared with LIDAR, the data availability of SODAR decreased about 80% at 200m altitude which distort mean wind profile, but after filtering out missing data, mean wind speed profile of SODAR was well fitted to a logarithmic profile. The wind speed measurement of SODAR was fitted to a slope of 0.94 and R2 of 0.94 to the LIDAR measurement. The relative standard deviation of mean wind speed error and standard deviation of wind direction error were evaluated to be 14% and 25 degrees, respectively over the whole measurement heights. 유럽 및 미주의 풍력자원조사는 풍황탑에 라이다 및 소다와 같은 지상기반 원격탐사를 병행하여 측정불확도를 경감하는 방향으로 진행되고 있다. 본 연구에서는 서해안 김제평야에서 원격탐사 캠페인을 수행하였으며, 풍력자원평가용 원격탐사장비인 윈드큐브 라이다와 메텍 PCS.2000-64 소다의 상호비교를 통하여 측정불확도를 평가하였다. 소다는 200m 높이에서 자료가용률이 80%로 저하되었으나 결손자료를 처리한 후 라이다와 동일한 로그법칙 풍속분포를 나타내었으며 두 측정장비 간의 평균풍속은 기울기 0.94, R2=0.94로 상관성이 높게 접합되었다. 그리고 풍속오차의 상대표준편차 및 풍향오차의 표준편차는 각각 14%와 25도로 전 측정높이에 대하여 균일하게 나타났다.
풍력자원평가용 윈드큐브 라이다와 렘텍 소다의 비교·검증 : 포항가속기 원격탐사 캠페인
김현구(Kim Hyun-Goo),정진화(Chyng Chin-wha),안해준(An Hae-Joon),지영미(Ji Yeong-mi) 한국태양에너지학회 2011 한국태양에너지학회 논문집 Vol.31 No.2
The remote-sensing campaign was performed at the Pohang Accelerator Laboratory where is located in a basin 6㎞ inland from Yeongil Bay. The campaign aimed uncertainty assessment of Remtech PA0 SODAR through a mutual comparison with WindCube LIDAR, the remote-sensing equipment for wind resource assessment. The joint observation was carried out by changing the setup for measurement heights three times over two months. The LIDAR measurement was assumed as the reference and the uncertainty of SODAR measurement was quantitatively assessed. Compared with LIDAR, the data availability of SODAR was about half. The wind speed measurement was fitted to a slope of 0.94 and R² of 0.79 to the LIDAR measurement. However, the relative standard deviation was about 17% under 150m above ground level. Therefore, the Remtech PA0 SODAR is judged to be unsuitable for the evaluation of wind resource assessment and wind turbine performance test, which require accuracy of measurement.
가상적 참값으로써 소다 측정자료를 적용한 라이다에 의한 풍속연직분포 측정의 불확도 분석
김현구(Kim Hyun-Goo),최지휘(Choi Ji-Hwi),장문석(Jang Moon-Seok),강용혁(Yong-Heack Kang),김광득(Kwang-Deuk Kim) 한국태양에너지학회 2010 한국태양에너지학회 학술대회논문집 Vol.2010 No.11
The uncertainty in WindCube LIDAR measurements, which are specific to wind profiling at less than 200m above ground level in wind resource assessments, was analyzed focusing on the error caused by its volume sampling principle. A two-month SODAR measurement campaign conducted in an urban environment was adopted as the reference wind profile assuming that various atmospheric boundary layer shapes had been captured. The measurement error of LIDAR at a height z was defined as the difference in the wind speeds between the SODAR reference data, which was assumed to be a virtually true value, and the numerically averaged wind speed for a sampling volume height interval of z±12.5m. The pattern of uncertainty in the measurement was found to have a maximum in the lower part of the atmospheric boundary layer and decreased with increasing height. It was also found that the relative standard deviations of the wind speed error ratios were 6.98, 2.70 and 1.12% at the heights of 50, 100 and 150m above ground level, respectively.
가상적 참값으로써 소다 측정자료를 적용한 라이다에 의한 풍속연직분포 측정의 불확도 분석
김현구(Kim Hyun-Goo),최지휘(Choi Ji-Hwi) 한국태양에너지학회 2010 한국태양에너지학회 논문집 Vol.30 No.4
The uncertainty in WindCube LIDAR measurements, which are specific to wind profiling at less than 200m above ground level in wind resource as sessments, was analyzed focusing on the error caused by its volume sampling principle. A two-month SODAR measurement campaign conducted in an urban environment was adopted as the reference wind profile assuming that various atmospheric boundary layer shapes had been captured. The measurement error of LIDAR at a height z was defined as the difference in the wind speeds between the SODAR reference data, which was assumed to be a virtually true value, and the numerically averaged wind speed for a sampling volume height interval of z±12.5m. The pattern of uncertainty in the measurement was found to have a maximum in the lower part o fthe atmospheric boundary layer and decreased with increasing height .It was also found that the relative standard deviations of the wind speed error ratios were 6.98, 2.70 and 1.12% at the heights of 50,100 and 150m above ground level, respectively.
도플러 소다 실측을 통한 익산 지역의 풍속 연직분포에 관한 연구
조강표(Cho, Kang-Pyo),정승환(Jeong, Seung-Hwan),다니 페르위타 사리(Dany Perwita Sari) 대한건축학회 2012 大韓建築學會論文集 : 構造系 Vol.28 No.1
The mean wind velocity profile obtained using wind velocities measured by Doppler SODAR at Iksan City Hall area are analyzed. Wind velocities are measured at a total of twelve levels, at 20-meter intervals from 39.4 meters to 259.4 meters, and are averaged for ten minutes. Also, the occurrence frequency of wind velocity by wind direction is estimated. The area of Iksan City Hall corresponds to exposure B according to Korean Building Code. The mean wind velocity profile and the power law exponent at Iksan City Hall area are estimated using data measured by Doppler SODAR and are compared with those of Korean Building Code. It was found from the study that wind velocities obtained from Doppler SODAR were 0.1m/s to 0.5m/s larger than those from Korean Building Code above about 80 meters from ground.
도플러 소다 실측을 통한 익산 지역의 풍속 연직분포에 관한 연구
조강표,정승환,다니 페르위타 사리,Cho, Kang-Pyo,Jeong, Seung-Hwan,Sari, Dany Perwita 대한건축학회 2012 대한건축학회논문집 Vol.28 No.1
The mean wind velocity profile obtained using wind velocities measured by Doppler SODAR at Iksan City Hall area are analyzed. Wind velocities are measured at a total of twelve levels, at 20-meter intervals from 39.4 meters to 259.4 meters, and are averaged for ten minutes. Also, the occurrence frequency of wind velocity by wind direction is estimated. The area of Iksan City Hall corresponds to exposure B according to Korean Building Code. The mean wind velocity profile and the power law exponent at Iksan City Hall area are estimated using data measured by Doppler SODAR and are compared with those of Korean Building Code. It was found from the study that wind velocities obtained from Doppler SODAR were 0.1m/s to 0.5m/s larger than those from Korean Building Code above about 80 meters from ground.
풍력자원평가용 윈드큐브 라이다와 씬텍 소다의 비교.검증 - 잠실 원격탐사 캠페인
김현구(Kim, Hyun-Goo),김동혁(Kim, Dong-Hyuk),전완호(Jeon, Wan-Ho),최현정(Choi, Hyun-Jeong) 한국신재생에너지학회 2011 신재생에너지 Vol.7 No.2
The only practical way to measure wind resource at high-altitude over 100 m above ground for a feasibility study on a high-rise building integrated wind turbine might be ground-based remote sensing. The remote-sensing campaign was performed at a 145 m-building roof in Jamsil where is a center of metropolitan city Seoul. The campaign aimed uncertainty assessment of Leosphere WindCube LIDAR and Scintec MPAS SODAR through a mutual comparison. Compared with LIDAR, the data availability of SODAR was about 2/3 at 550 m altitude while both showed over 90% under 400 m, and it is shown that the data availability decrease may bring a distortion of statistical analysis. The wind speed measurement of SODAR was fitted to a slope of 0.92 and R² of 0.90 to the LIDAR measurement. The relative standard deviation of wind speed difference and standard deviation of wind direction difference were evaluated to be 30% and 20 degrees, respectively over the whole measurement heights.