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The Study on the Mapping of Wind Resource using Moving Filter Technique at Udo, Jeju Island

무빙필터 기법을 적용한 제주 우도지역의 풍력자원지도 작성에 대한 연구

  • Moon, Seo Jeong (Multidsciplinary Graduate School for Wind Energy, Jeju National University) ;
  • Ko, Jung Woo (Multidsciplinary Graduate School for Wind Energy, Jeju National University) ;
  • Lee, Byung Gul (Civil Engineering, Jeju National University)
  • 문서정 (제주대학교 대학원 풍력특성화 협동과정) ;
  • 고정우 (제주대학교 대학원 풍력특성화 협동과정) ;
  • 이병걸 (제주대학교 해양과학대학 토목공학과)
  • Received : 2012.08.31
  • Accepted : 2012.11.20
  • Published : 2012.12.30

Abstract

In order to create a wind resource map, we need wind data, contour map and roughness map. Moving Filter technique was applied to Udo of Jeju Island to improve the accuracy and efficiency of creating roughness map based on the Land Cover Map of the Ministry of Environment. The Land Cover Map was simplified using moving filtering, and the roughness map was created with this Land Cover Map. The wind resource map was created using this roughness map. Finally, we verified the validity and application of moving filter technique for wind resource map. As a result, the wind map which was created using the roughness map with moving filtering showed bias values which were all negative. It means the wind map is underestimated to values of wind energy and RMSE values were also from 0.0237m/s to 0.0253m/s at 50m height. In other words, estimation of wind resource using image filtering provides reliable results at 80m height typically when the wind turbine is installed. Finally, we found that image filtering technique is very useful tool to make wind resource map.

풍력자원지도를 작성하기 위해서는 풍황자료, 지형고도지도, 지면조도지도가 필요하다. 본 연구는 이 중 지면조도지도를 생성하는 작업의 효율성과 정확도를 높이기 위해 환경부의 토지피복지도에 영상필터링 기법 중 무빙필터를 적용하였다. 필터링된 토지피복지도를 이용하여 지면조도지도를 생성하였고 이를 가지고 풍력자원지도를 작성해봄으로써, 필터링을 거쳐 풍력자원지도를 작성하여도 타당한지 여부를 검증하였다. 그 결과, 필터링을 적용한 지면조도지도를 사용하여 작성한 바람지도 모두 과소예측을 보였으나 오차정도가 매우 작았고, RMSE 또한 50m높이에서 0.0237~0.0253m/s 정도로 거의 0에 근접한 결과를 보였다. 즉, 풍력발전기가 설치되는 80m 이상의 높이에서는 오차의 정도가 더욱 줄어들 것이고, 풍력자원예측 시 작업의 효율성을 위해 필터링기법을 적용하여도 신뢰할 만한 풍력자원지도를 얻을 수 있을 것이다.

Keywords

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  1. Remote Sensing 기술을 활용한 제주 북동부 지역의 풍력자원 예측의 정확성 향상에 대한 연구 vol.30, pp.4, 2012, https://doi.org/10.5322/jesi.2021.30.4.335