• Proceedings of KOSOMES biannual meeting
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• 2017.11a
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• pp.171-171
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• 2017

• 한국신재생에너지학회:학술대회논문집
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• 2010.11a
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• pp.188.2-188.2
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• 2010

북한은 자급자족의 형태로 지하자원과 수력을 이용하여 에너지원으로 사용하고 수입연료를 자제하는 실정이다. 하지만 기존의 발전 설비들의 노후화와 지하자원의 확보의 어려움이 증가 되어 신재생에너지의 개발을 확대하고 있다. 이에 우리나라에서는 남북의 기술교류 확대 및 미래 에너지 자원의 확보를 위하여 북한 자원자원에 대한 연구가 이뤄지고 있다. 기존의 연구에서는 북한지역의 관측값을 활용하거나 저해상도의 바람지도들이 작성되었다. 북한 지역의 바람의 분포를 세밀히 파악하기 위하여 기존의 바람지도 보다 상세한 풍력-기상자원지도가 필요하기 때문에 연구를 진행하였다. 북한의 풍력-기상자원지도를 개발하기 위해 미국 NCAR에서 개발한 중규모 모형인 WRF(Weather Research & Forcasting)을 활용하였다. 좋은 풍력자원을 갖춘 장소에 풍력 단지를 조성하기 위해서는 고해상도의 기상자원지도를 이용해서 파악하는 것이 필요하므로 해상도를 1km으로 설정하여 수행되었다. 본 연구의 결과로 지상 80 m에서의 1km 해상도를 갖는 풍력-기상자원지도를 작성하였다. 개발된 풍력-기상자원지도의 검증을 위해서 우리나라에서 확보가 가능한 북한 27개 지점의 지상 10 m 바람자료들을 활용하였다. 풍속에 대한 검증은 Bias와 RMSE을 이용하였으며, 풍향의 검증은 MAE을 활용하였다. 연 평균의 북한의 풍력-기상자원지도를 보면, 북한의 산맥을 중심으로 다른 지역보다 높은 풍속 분포를 보이고 있으며, 황해도를 포함한 북한의 서해안지역에서 비교적 높은 풍속의 분포를 나타내고 있다. 계절별로 살펴보면 봄철과 겨울철에 여름과 가을철보다 높은 풍력자원이 나타나며, 여름철이 가장 낮은 풍력자원을 갖는 것으로 분석되었다.

• Journal of the Korean Solar Energy Society
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• v.32 no.3
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• pp.33-41
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• 2012

As the wind farms in large scale demand enormous amount of construction cost, minimizing the economic burden is essential and also it is very important to measure the wind resources and forecast annual energy production correctly to judge the economic feasibility of the proposed site by way of installing a Met mast at or nearby the site. Wind resources were measured by installing a 80[m] high Met mast at WangdeungYeo Island to conduct the research incorporated in this paper and offshore wind farm was designed using WindPRO. Wind farm of 100[MW] was designed making use of 3 and 4.5[MW] wind generator at the place selected to compare their annual energy production and capacity factor applying the loss factor of 10[%] and 20[%] respectively to each farm. As a result, 336,599[MWh] was generated by applying 3[MW] wind generator while 358,565 [MWh] was produced by 4.5[MW] wind generator. Difference in the energy production by 3[MW] generator was 33,660 [MWh] according to the loss factor with the difference in its capacity factor by 3.8[%]. On the other hand, 23 units of 4.5 [MW] wind generators showed the difference of annual energy production by 35,857 [MWh] with 4.0[%] capacity factor difference.

• Journal of the Korean Geosynthetics Society
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• v.12 no.4
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• pp.45-56
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• 2013

Recently, offshore wind farms are increasingly expected, because there are huge resource and large site in offshore. Jeju island has optimum condition for constructing a wind energy farm. Unlike the mainland, Jeju island has stratified structure distribution between rock layers sediments due to volcanic activation. In these case, it can be occur engineering problems in whole structures as well as the safety of foundation as the thickness and distribution of sediment under top rock layer can not support sufficiently the structure. In this paper, the settlement and stress distribution is predicted by numerical analysis when the mono-pile base are constructed on various soft layer between stratified structure. To determine the settlement of the pile foundation supported on stratified rock layer, the geological investigation at the 3 regiions and the results of laboratory experiments of the stratified rock layer is required.

• Journal of Navigation and Port Research
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• v.45 no.3
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• pp.130-137
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• 2021

The main purpose of this study is to provide an objective evaluation standard for the assessment of marine spatial characteristics via Ulsan floating offshore wind power project using HEA.. Various levels of damage occur in the waters (5,017.6) near the floating offshore wind power terminals in Ulsan, including commercial damage, ecological destruction and reduction in quality of life due to seascape damage. Alternative restoration projects for calculating the economic value of damage were selected including artificial reef projects and estimates based on HEA. For basic households with a 4.5% social discount rate and a 100% maturity index over four years, the damage was approximately 457 hundred million won. The HEA in this study resolves the possible irrationality in the evaluation of marine spatial characteristics, since the value is calculated based on objective and clear DATA. Therefore, the study results are intended to facilitate conflict resolution between stakeholders in the future during the implementation of the marine spatial plan.

• The Journal of the Korea institute of electronic communication sciences
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• v.17 no.2
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• pp.265-278
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• 2022

The global energy paradigm is rapidly changing by centering on carbon neutrality, and wind energy is positioning itself as a leader in renewable energy-based power sources. The success of onshore and offshore wind energy projects focuses on securing the economic feasibility of the project, which depends on securing high-quality wind resources and optimal arrangement of wind turbines. In the process of constructing the wind farm, the optimal arrangement method of wind turbines considering the main wind direction is important, and this is related to minimizing the wake effect caused by the fluid passing through the structure located on the windward side. The accuracy of the predictability of the wake effect is determined by the wake model and modeling technique that can properly simulate it. Therefore, in this paper, using WindSim, a commercial CFD model, the wake diffusion pattern is analyzed through the sensitivity study of each wake model of the proposed onshore wind farm located in the mountainous complex terrain in South Korea, and it is intended to be used as basic research data for wind energy projects in complex terrain in the future.

• Journal of Wind Energy
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• v.13 no.1
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• pp.5-14
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• 2022

Currently, the Korean government is driving the construction of large-scale floating offshore wind farms to increase domestic renewable energy generation and decrease carbon emissions. In offshore wind farms, maintenance approaches can be limited more often than onshore wind farms by marine weather conditions (wave height, etc.). Therefore, maintenance planning optimization is more important to minimize maintenance costs and power generation loss by downtime. Additionally, the power generation of a wind farm is affected by wind speed as well as wind direction because of the wake effect, so it is possible that power generation loss by downtime is also dependent on combinations of weather conditions (wind speed and direction) and the location of wind turbines for maintenance. In this study, the effects of the wind conditions and the locations of tripped wind turbines on power generation loss were explored for a hypothetical floating offshore wind farm. In order to calculate the power generation of a wind farm, a wake effect calculator was developed based on Jensen's formula. Then, a simple methodology of determining maintenance priorities that minimize power generation loss was proposed.

• Proceedings of the KIPE Conference
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• 2013.07a
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• pp.445-446
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• 2013

최근 대규모 해상풍력단지 조성을 위한 프로젝트 등이 진행되고 있다. 매우 튼 전력을 생산하는 풍력발전기를 계통에 연계시키기 위해서는 du/dt 필터, LCL 필터 등의 요소가 반드시 필요하다. 이러한 필터 설계를 위해서는 선제작한 후 실제 실험을 통해 그적합성을 시험 받는 수밖에 없다. 작은 규모는 상관없지만 이렇게 큰 용량의 필터를 설계하기 위해서는 적지 않은 노력과 비용이 필요하다. 따라서 이러한 설계를 위해서는 많은 시뮬레이션 수단이 강구될 수 있는바 본 논문은 FEM 프로그램을 이용하여 LCL 필터용의 3상 리액터를 설계하고 그 효과를 검증하고자 한다.

• Journal of the Korean Society of Marine Environment & Safety
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• v.14 no.3
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• pp.205-210
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• 2008

In recent years, the crisis of energy is growing seriously and also the contamination of ecology has been reverberated as international problem. The social concern about energy crisis has been growing for the last several years and also the interest in new and renewable energy has been increased. The probability of wind power resource over Saemangeum is reviewed with the data of Gunsan weather station. Through this study, it is cleared that the Saemangeum area has fluent wind power source to design the wind farm in Korea. According to calculation results, it is possible to predict the wind velocity density around the Saemangeum area using the shape factor as a parameter.

• Proceedings of the Korean Institute of Navigation and Port Research Conference
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• 2016.05a
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• pp.255-256
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• 2016

어선의 어업별 밀집 분포도 구축을 통해 어선의 통항흐름을 인지하여, 스크류/추진기 등의 손상과 어망 손괴사고 등을 예방할 수 있다. 아울러, 전국 연안 VTS의 관제구역 설정, 제주연안 돌고래 보호구역 설정, 해상풍력발전 단지 조성과 같은 해상교통안전진단 등의 타당성 입증자료, 허베이스피리트호 사건과 같은 유류유출사고 등과 같은 피해액 산출 추정을 위한 기초 자료로도 활용될 수 있을 것으로 판단된다.