• The Journal of the Korea institute of electronic communication sciences
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• v.18 no.3
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• pp.387-396
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• 2023

The representative equipments currently used for weather observations are meteorological masters and wind lidars. According to international regulations, meteorological masters can be used for standalone measurements, but in case of wind lidars, it is mandatory to install a meteorological master that matches the height of the bottom of the wind turbine blade or a 40m meteorological masters and correct the measurement data. Turbulence flow occurs frequently at altitudes below 100m due to its nature, and wind lidars are more susceptible to the effects of turbulence than meteorological masters. However, while the turbulence intensity for meteorological masters is specified by international regulations, there is no separated specification for wind lidars. This study collected data measured under the same conditions using both meteorological masters and wind LiDARs, analyzed the uncertainties and turbulence intensity ratio. The analysis of the data showed that there were partial sections where the proportion of turbulent flow intensity exceeded 3%. Therefore, it is suggested to include a specification for the turbulence intensity error rate for wind LiDARs in the international regulations.

• Journal of Korean Society for Geospatial Information Science
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• v.21 no.4
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• pp.65-71
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• 2013

Wind shear means the variation of wind speed according to the height. Wind shear is the important factor affecting the energy production of wind turbines. Power Law is used to extrapolate wind speed data. Normally, a Power Law exponent of 0.143 is used and this is referred to as the 1/7th Power Law. The Power Law exponent is affected by atmospheric stability and surface roughness of the site. Thus, it is necessary to calculate the Power Law exponent of the site exactly for an accurate estimation of wind energy. In this study, wind resources were measured at the three Met-masts which were located in the coastal area of northeastern Jeju Island. The Power Law exponents of the sites were calculated and proposed using measured data. They were 0.141 at Handong, 0.138 at Pyeongdae, and 0.1254 at Udo. We compared annual energy productions which are calculated using a Power Law exponent of 0.143, the proposed value of the Power Law exponents for each site, and the measured data. As a result, the cases of calculating using the proposed values were more similar to the cases using the measured data than the cases using the 0.143 value. Finally, we found that the propsed values of the Power Law exponent are available to more accurately estimate wind resources.

• Journal of Korean Society for Geospatial Information Science
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• v.25 no.1
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• pp.3-8
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• 2017

In this study future wind resource maps have been produced under climate change scenario using ensemble regional climate model weather research and forecasting(WRF) for the period from 2045 to 2054(mid 21st century). Then various spatiotemporal analysis has been conducted in terms of monthly and diurnal. As a result, monthly variation(monsoon circulation) was larger than diurnal variation(land-sea circulation) throughout the South Korea. Strong wind area with high wind power energy was varied on months and regions. During whole years, strong wind with high wind resource was pronounced at cold(warm) months in particular Gangwon mountainous and coastal areas(southwestern coastal area) driven by strong northwesterly(southwesterly). Projected strong and weak wind were presented in January and September, respectively. Diurnal variation were large over inland and mountainous area while coastal area were small. This new monthly and diurnal variation would be useful to high resource area analysis and long-term operation of wind power according to wind variability in future.

• Journal of Korean Society for Geospatial Information Science
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• v.23 no.1
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• pp.15-22
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• 2015

To create a wind resource map, we need a contour map, a roughness map and wind data. We need a land cover map for the roughness map of these data. A land cover map represents the area showing similar characteristics after color indexing based on the scientific method. The features of land cover is classified by Remote sensing technique. In this study, we verified the application of the NDVI technique is reasonable after we created the wind resource map using roughness maps by unsupervised classification and NDVI technique. As a result, the wind resource map using the NDVI technique showed a 60% accordance rate and difference in class less than one. From the results, The NDVI technique is found alternative to create roughness maps by the unsupervised classification.

• Proceedings of the KIEE Conference
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• 2011.07a
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• pp.584-585
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• 2011

우리나라 자가발전 도서 132개 중 10개 도서를 대상으로 디젤발전과 태양광 풍력의 경제성을 비교하였다. 도서별 전력수요 추정과 함께 발전원의 수명기간 동안 총 비용을 총 발전량으로 나눈 균등화발전단가(원/kWh)를 경제성 분석지표로 사용하였다. 도서별 실제 태양광과 풍황 등 자원량을 반영하지는 않았고 태양광 15%, 풍력 21% 이용률을 가정하였다. 그 결과 4개도서가 경제성 확보가 가능한 것으로 분석되었다. 향후 국가 차원의 손실 최소화 방안 및 국가적 편익 비용을 산출함으로서 향후 도서지역 중장기 경제적 전력공급을 위한 도서 전원 구성에 관한 정책적 방향을 제시할 예정이다.

• Journal of the Korean Solar Energy Society
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• v.23 no.4
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• pp.21-27
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• 2003

The comparative performance of the WAsP in calculating the wind climate in complex terrain has been examined in order to test the predictability of the wind resource assessment computer code in our country. An analysis was carried out of predicted and experimental 10-min averaged wind data collected over 8 months at four monitoring sites in SongDang province, Jeju island, composed of sea, inland flat terrain, a high and a low slope craters. The comparisons show that the WAsP preditions give better agreement with experimental data by adjusting the roughness descriptions, the obstacle list.

• 한국신재생에너지학회:학술대회논문집
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• 2010.11a
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• pp.190.2-190.2
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• 2010

LIDAR는 레이저를 대기에 송출하여 미세먼지의 이동에 의한 도플러 위상차를 검출함으로써 3차원 풍속벡터를 측정하는 원격탐사 장비로, 한국에너지기술연구원은 국내최초로 WindCube LIDAR를 도입하여 운영 중에 있다. LIDAR의 장점은 이동성, 설치의 편리성 외에도 현재까지 풍황탑이 모든 범위를 측정하지 못한 풍력발전기 블레이드 회전면 최고 높이인 지면 150m 까지의 풍속분포를 상세하게 측정할 수 있다는 특장점이 있다. WindCube LIDAR는 총 10개의 측정 고도를 설정할 수 있으며 1Hz로 원시자료를 획득하여 10분 평균자료로 저장한다. 이러한 측정자료를 통하여 기존 기상탑에서 불가능하였던 풍속분포의 정확한 이해와 난류특성의 파악이 가능하게 되었으나 반대급부로 급증한 측정자료의 정리와 분석에 많은 시간과 노력이 필요하게 되었다. 이에 한국에너지기술연구원에서는 LIDAR 측정자료의 가공 및 분석에 편리성을 제공하기 위해 KIER-$LidarWind^{TM}$ 프로그램을 개발하였으며, 2차원 등치선도 및 3차원 풍속분포 그래프를 시각함으로써 입체적인 가공 및 분석이 가능하도록 하였다.

• Journal of Wind Energy
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• v.15 no.3
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• pp.38-61
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• 2024

The purpose of this study is to introduce in detail an universal methodology of wind resource and energy yield assessment for feasibility studies of offshore wind projects. To conduct a preliminary feasibility study for offshore wind projects, an assessment of wind resources and energy yield are usually performed at an early stage, and this can be an essential process for deriving an economic feasibility evaluation of the project. However, many domestic case studies and preliminary feasibility studies are still conducted using methodologies that lack valid evidence and professionalism. Accordingly, this study introduces methods for general wind resource assessments, wind farm layout (design), and energy yield assessments, and gives detailed reasons why the analysis procedure is necessary. In other words, it was carried out to support to improve the quality and level of basic research related to domestic offshore wind studies.

• Transactions of the Korean Society of Mechanical Engineers B
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• v.40 no.4
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• pp.201-212
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• 2016

A Wind resource assessment and optimal micrositing of wind turbines were implemented for the development of an onshore wind farm of 30 MW capacity on Gadeok Island in Busan, Republic of Korea. The wind data measured by the automatic weather system (AWS) that was installed and operated in the candidate area were used, and a reliability investigation was conducted through a data quality check. The AWS data were measured for one year, and were corrected for the long term of 30 years by using the modern era retrospective analysis for research and application (MERRA) reanalysis data and a measure- correlate-predict (MCP) technique; the corrected data were used for the optimal micrositing of the wind turbines. The micrositing of the 3 MW wind turbines was conducted under 25 conditions, then the best-optimized layout was analyzed with a various wake model. When the optimization was complete, the estimated park efficiency and capacity factor were from 97.6 to 98.7 and from 37.9 to 38.3, respectively. Furthermore, the annual energy production (AEP), including wake losses, was estimated to be from 99,598.4 MWh to 100,732.9 MWh, and the area was confirmed as a highly economical location for development of a wind farm.

• Journal of Korean Society for Geospatial Information Science
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• v.20 no.4
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• pp.29-36
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• 2012

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.