• Proceedings of KOSOMES biannual meeting
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• 2017.04a
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• pp.17-17
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• 2017

• 한국태양에너지학회:학술대회논문집
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• 2008.11a
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• pp.300-305
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• 2008

Using WindPRO that was software for windfarm design developed by EMD from Denmark, wind resources for the western Jeju island were analyzed, and the performance of WindPRO prediction was evaluated in detail. The Hansu site and the Yongdang site that were located in coastal region were selected, and wind data for one year at the two sites were analyzed using WindPRO. As a result, the relative error of the Prediction for annual energy Production and capacity factor was about ${\pm}20%$. For evaluating wind energy more accurately, it is necessary to obtain lots of wind data and real electric power production data from real windfarm.

• The Transactions of The Korean Institute of Electrical Engineers
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• v.60 no.2
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• pp.273-278
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• 2011

By introducing RPS(Renewable Portfolio Standard) for reduction of greenhouse gas, Renewable energy has becoming widespread gradually. Due to a large number of advantages, wind power, which is one of Renewable energy, has standing in the spot-light rather than other Renewable energy. Wind power, however, is difficult to control output and because of severe output fluctuation, it would cause some problems when it is connected with system. Using battery as a solution for these problems has been researched all over the world. In this paper, the reliability modeling of windfarm connected battery and reliability evaluation of system are executed. Also the optimum battery capacity is selected through evaluating reliability cost.

• Journal of Environmental Impact Assessment
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• v.31 no.1
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• pp.47-62
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• 2022

Wind power has been rapidly growing over last decade in the world as well as in South Korea as a feasible renewable energy source. Providing sustainable energy to all while securing environmental sustainability requires evidence based policy making and innovative solutions. Through analysis of 58 cases of South Korean Environmental Impact Assessment (EIA) Report, this paper seeks to identify answers to the following two questions. What are the key characteristics for inland windfarm? Is there a way of measuring environmental sustainability to compare each location to reduce negative environmental impact? Variables related to environmental sustainability of each windfarm case were collected from EIA report and the factor analysis of environmental variables was conducted to calculate the weight for each variable to build environmental sustainability index (ESI) to provide as evidence-based tools for decision making on the location of inland windfarm. 58 cases were categorized as three types 1) Mountain type 2) Ranch Type and 3) Coastal Type depending on their height and degree of naturalness. For analytical research, first, it was successfully calculated environmental sustainability of each windfarm case ranging from 1.04 (#33, Ranch type) to -1.44 (#55, Mountain type). Second, the analysis results showed that ranch type is most environmentally sustainable (Average ESI = 0.4551), followed by coastal type (Ave ESI = 0.3712) and lastly mountain type (Average ESI = -0.3457). These findings are consistent with the previous researches on inland windfarms and provides substantive policy implication on the renewable energy policies.

• International conference on construction engineering and project management
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• 2022.06a
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• pp.204-212
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• 2022

Recently, the Korean government has been actively promoting the smart city as their strategic agenda. However, to build smart cities that are greener, the authors believe it is essential to rapidly transit conventional energy sources such as fossil fuels to renewable energy. Although there is a big potential for Offshore wind in Korea, there has not been a full-scale commercial offshore wind farm until today. Since Korea is relatively a new market compared to the EU, it can be risky for developers. The authors will introduce risk management best practices in the offshore wind industry applicable to the Korean environment. This paper will mainly introduce an offshore wind project size of 99 MW. The project is expecting a Finance Close (FC) in Q3 2022, so the project team has prepared a risk register with over 150 risks and levers throughout the project lifecycle. Overall risks include risks with Development Expenditure (DEVEX) impact, a Capital Expenditure (CAPEX) impact, and an Operating Expenditure (OPEX) impact. Based on the identified risks, a more qualitative assessment of Cost and Schedule Impact was conducted. In conclusion, a Monte Carlo simulation was performed to propose a quantitative risk assessment to evaluate a benchmark contingency of the project cost.

• 한국신재생에너지학회:학술대회논문집
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• 2005.11a
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• pp.505-518
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• 2005

풍력발전기술은 전적으로 바람의 세기에 의존하는 신재생에너지원으로서 바람의 강도가 발전전력의 양과 풍력시스템의 효용성에 절대적인 영향을 미치게 된다. 따라서, 본 연구사업을 통해서 이루어지는 풍력자원의 조사는 풍력발전기술의 적용에 앞서 최우선적으로 수행되어야 함이 본 연구사업의 중요성이라 할 수 있다. 풍력자원에 대한 실측자료로서 풍력자원 특성의 분석이 가능하고 이에 따라 풍력발전기의 용량 및 수량과 적용방안 및 최종적으로 정량적인 의미에서의 경제성 분석도 가능하게 되었다. 본 연구에서는 장차의 본격적인 풍력발전기술의 적용에 앞서 기존 기상청의 풍력자료와 일정한 기준에 의하여 선정된 후보지점을 중심으로 도상검토 및 실사를 통해 1차년도에 9군데, 2차년도에 6군데 총 15개 지점에 대한 실측지점을 선정하여 실측기기의 설치와 풍력자료의 분석으로서 정밀한 풍력자원의 특성을 분석하고 향후 본격적인 풍력발전 단지 건설 사업추진에 대비하고자 수행된 연구사업이며, 아울러 개괄적인 국내 풍력자원 분포를 파악하기 위한 광역 풍력자원 분포도를 개발하였다.

• Proceedings of the KIEE Conference
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• 2011.07a
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• pp.447-448
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• 2011

일반적으로 BTB STATCOM은 계통 분리 운전이나 이종계통의 연계 등의 목적으로 이용한다. 기본 구성으로는 두 대의 STATCOM을 직렬로 연결하여 계통에 삽입되며, 구조 및 개념상 HVDC와 유사한 특징을 갖고 있다. 본 논문에서는 국내에서는 처음으로 독자 개발에 성공한 STATCOM의 기술을 바탕으로 BTB STATCOM을 개발하고, PSCAD/EMTDC를 이용하여 BTB STATCOM의 모델링 및 계통 연계 모의를 수행하였다. 풍력발전의 발전량이 변하더라도 BTB STATCOM이 응동하여 실제 발전량을 정상적으로 전달하고 있음을 확인하였다.

• Proceedings of the KIEE Conference
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• 2015.07a
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• pp.161-162
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• 2015

최근 세계적으로 전력계통의 대륙 간 연계나 신재생에너지, 분산전원의 계통 연계를 위해 HVDC(High voltage Direct Current)에 대한 연구가 활발히 진행되고 있다. 대용량, 장거리 송전이 필요한 경우 HVAC에서의 전력손실과 송전거리의 한계를 극복하기 위하여 HVDC가 새로운 대안으로 떠오르고 있으며, LCC(Line commutated Converter)와 VSC(Voltage Source Converter)의 기술발전이 비약적으로 이뤄지고 있다. 특히, DC Grid화를 위해서 유럽에서는 해상풍력을 연계한 Windfarm을 DC Grid화 하는 프로젝트가 활발히 진행되고 있다. 이러한 신재생 에너지의 계통 연계를 위해서 DC Grid가 본격적으로 논의가 되고 있고 관련분야에서는 기술개발을 앞다퉈 진행하고 있는 상황이다. DC Grid 구현을 위해 VSC HVDC가 최근 주목받고 있으며, VSC로 연계된 DC Grid의 AC 계통과의 연계를 위해 가장 필요한 것이 바로 DC 차단기라고 할 수 있겠다. 본 논문에서는 DC Grid의 고장분석을 위한 기초연구로써 MMC(Modular Multilevel Converter) VSC를 기반으로 한 Point-to-Point HVDC Grid에서의 DC 고장에 대한 분석을 실시하였으며 그 특징을 분석하였다.

• Proceedings of the KIEE Conference
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• 2006.07b
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• pp.1197-1198
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• 2006

The wind turbine system, one of the distributed resource, has a large effect on the distribution system. because windfarm is located in the end part of the distribution system, the hilly section and the shore, which is easy to obtain the wind energy, it is difficult to manage the voltage and the power quality. Therefore this paper deals with the measurement and assessment of power quality characteristic of wind turbines with IEC 61400-21.

• Journal of Wind Energy
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• v.4 no.1
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• pp.68-74
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• 2013

Offshore wind farm is being increased since there are much trouble to develop onshore wind farm. But in the offshore, wind turbine wake does not dissipate less than onshore wind turbine because of low turbulence level. Thus this remained wake interacted to other wind turbine. This interaction reduces energy production in wind farm and have a bad influence on fatigue load of wind turbine. In this research, CFD model was constructed to analyze wake effect in offshore wind farm. A method that wind turbine rotor region was modelled in porous media was devised to reduce computation load and validated by comparison with Horns Rev measurement. Then wake interaction between two wind turbine was analyzed by devised porous model.