Journal of Korean Society of Coastal and Ocean Engineers (한국해안·해양공학회논문집)

Korean Society of Coastal and Ocean Engineers (한국해안·해양공학회)
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Error analysis on the Offshore Wind Speed Estimation using HeMOSU-1 Data

HeMOSU-1호 관측 자료를 이용한 해상풍속 산정오차 분석

  • Ko, Dong Hui (Department of Civil and Environmental Engineering, Wonkwang University) ;
  • Jeong, Shin Taek (Department of Civil and Environmental Engineering, Wonkwang University) ;
  • Cho, Hongyeon (Marine Environments and Conservation Research Division, Korea Institute of Ocean Science and Technology) ;
  • Kim, Ji Young (KEPCO Research Institute) ;
  • Kang, Keum Seok (KEPCO Research Institute)
  • 고동휘 (원광대학교 토목환경공학과) ;
  • 정신택 (원광대학교 토목환경공학과) ;
  • 조홍연 (한국해양과학기술원, 해양환경.보전연구부) ;
  • 김지영 (한국전력공사 전력연구원) ;
  • 강금석 (한국전력공사 전력연구원)
  • Received : 2012.09.25
  • Accepted : 2012.10.17
  • Published : 2012.10.31
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Abstract

In this paper, error analyses on the calculation of offshore wind speed have been conducted using HeMOSU-1 data to develop offshore wind energy in Yeonggwang sea of Korea and onshore observed wind data in Buan, Gochang and Yeonggwang for 2011. Offshore wind speed data at 98.69 m height above M.S.L is estimated using relational expression induced by linear regression analysis between onshore and offshore wind data. In addition, estimated offshore wind speed data is set at 87.65 m above M.S.L using power law wind profile model with power law exponent(0.115) and its results are compared with the observed data. As a result, the spatial adjustment error are 1.6~2.2 m/s and the altitude adjustment error is approximately 0.1 m/s. This study shows that the altitude adjustment error is about 5% of the spatial adjustment error. Thus, long term observed data are needed when offshore wind speed was estimated by onshore wind speed data. because the conversion of onshore wind data lead to large error.

본 연구에서는 해상풍력발전 후보지인 영광해상에 설치한 해상 기상타워 해모수 1호(HeMOSU-1)의 2011년 연간 풍속 관측 자료와 기상타워 해모수 1호 설치 지점에 인접한 부안, 고창, 영광 3개 지점의 육상 풍속자료를 이용하여 해상 임의고도에서의 풍속 산정 과정에서 발생하는 오차에 대한 분석을 수행하였다. 먼저 육상 풍속자료와 해상 풍속자료의 선형회귀분석으로 유도된 관계식을 이용하여 해상 기준고도(평균해수면 98.69 m)의 해상풍속자료를 추정하였다. 그리고, 추정된 해상풍속 자료는 관측자료를 통해 산출된 고도분포지수 값(${\simeq}0.115$)과 멱법칙 풍속프로파일을 이용하여 87.65 m 높이로 고도보정하여 관측치와 비교하였다. 연구 수행결과, 공간보정오차는 1.6~2.2 m/s 정도이며, 고도보정오차는 0.1 m/s 정도로 공간보정오차의 약 5% 정도에 불과한 것으로 파악되었다. 육상자료를 환산하여 해상임의지점의 풍속을 추정하는 경우, 큰 오차가 발생하기 때문에 장기간의 해상자료를 확보하거나 정확도가 높은 모델링 자료를 이용하여야 할 것으로 판단된다.

Keywords

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