• 한국가스학회지
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• 제27권1호
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• pp.33-37
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• 2023

기후변화 문제를 해결하기 위한 각국의 노력은 계속되고 있고, 친환경 연료로의 전환은 지속적으로 진행해야 할 인류의 과제이다. 국내에서는 최근 재생에너지자원이 비교적 풍부한 제주도에서 재생에너지와 연계한 그린수소를 생산하는 기술을 실증하기 위하여 준비 중이며, 본 연구에서는 국내외 기술현황을 파악 후 해외선진기업의 고분자 전해질 수전해 장치를 도입하여 적용하는 것을 목표로 하고 있다. 본 연구를 진행하면서 국외에서 제작되는 수전해 장치에 대하여 국내안전규제에 부합한 시스템 도입과정과 핵심부품의 평가방법을 소개하고자 한다.

• 한국전자통신학회논문지
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• 제16권1호
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• pp.61-68
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• 2021

풍력이나 태양광 같은 재생에너지의 활용은 온실가스 감축과 경제성 확보를 얻기 위해서 많은 나라에서 피할 수 없는 선택이 되고 있다. 그러나 재생에너지의 간헐성 때문에 계통으로 연계되는 재생에너지의 비중이 커지게 되어 얻어지는 문제가 더욱 크게 부각되고 있다. 복합에너지시스템은 일반적으로 2개 이상의 재생에너지원이 서로 함께 사용되면서 시스템 효율을 증가시킬 뿐만 아니라 에너지 공급에서 더욱 안정적이다. 전력시스템을 비교해 보면 복합에너지시스템의 제어 및 최적화는 모델링, 운전 및 운영계획의 요소가 더욱 어려워진다. 마이크로그리드시스템을 갖는 삼마도에 대한 복합에너지시스템 성능개선의 주 목적은 다양한 분산전원, 에너지저장장치, 전력계통의 신뢰성을 확보하기 위해서 상호 조화롭게 조정하는 것으로 운전비용을 줄이고 최상의 경제적인 이득을 얻기 위한 것이다. 본 논문은 최적의 마이크로그리드시스템을 갖는 개선된 삼마도 복합에너지시스템을 제안한다. 시험운전결과 ESS의 SOC 변동폭이 약 12%로 낮아졌으며, 태양광 발전제약이 제거되었고, 디젤발전기의 운전시간이 감소함을 확인할 수 있었다.

• 한국신재생에너지학회:학술대회논문집
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• 한국신재생에너지학회 2006년도 추계학술대회
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• pp.277-280
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• 2006

This paper deals with the possibility on the hybrid power system concerning wind energy at a really existing island, Sunyoo-do in the west sea near Seamangeum. In the present stage, Diesel system produces all the electrical power of the Island. However, in the new proposed system of Diesel and wind energy, an optimized guideline for drive from the economic analysis on this hybrid system is given by a mathematical and statistical modelling with a share software HOMER (hybrid optimization model for electric renewables). After a series of analysis it has been shown that the hybrid system can reduce the total expenses as well as air pollution.

• 한국전자통신학회논문지
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• 제10권4호
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• pp.527-532
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• 2015

국내 섬지역의 전력 수급은 계통 연계가 어려워 일반적으로 디젤 발전기에 의존하고 있어 관리 비용이 매우 높다. 이러한 문제를 해결하기 위해 최근 계통 독립형 마이크로그리드 기술에 대한 연구 및 실증이 활발히 진행 중이다. 본 논문은 에너지 자립섬을 위한 계통 독립형 마이크로그리드 통합 모니터링 시스템을 제안한다. 먼저 태양광, 풍력, 디젤 발전설비, 송 배전망의 상태 및 부하, 그리고 에너지 저장 시스템의 모니터링을 위한 소프트웨어 시스템 아키텍처를 설계한 후 관리자가 쉽게 파악할 수 있는 모니터링 소프트웨어를 구현한다. 구현된 모니터링 소프트웨어는 발전설비의 상태 및 오류를 실시간으로 시각화함으로써 관리자의 신속한 의사 결정이 가능하다.

• 전력전자학회논문지
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• 제20권6호
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• pp.550-557
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• 2015

The Jeju Special Self-Governing Province is currently promoting the "Carbon-free Island by 2030" policy, which requires the use of renewable energy instead of fossil fuel so that the island will have no carbon gases generated by 2030. To implement this policy, the island plans to build a wind power plant capacity of 1.09 GW in 2020; this wind power plant is currently ongoing. However, when wind power output is greater than the power demand of the island, the stability of Jeju Island power system must be prepared for it because it can be a problem. Therefore, this study proposes a voltage source-type MMC-HVDC system linked to mainland Korea to expand the wind power penetration limits of Jeju Island under the stable operation of the Jeju Island power system. To verify the effectiveness of the proposed scheme, computer simulations using the PSCAD/EMTDC program are conducted, and the results are demonstrated. The scenarios of the computer simulation consist of two cases. First, the MMC-HVDC system is operated under variable wind power in the Jeju Island power system. Second, it is operated under the predicted Jeju Island power system in 2020.

• 한국수소및신에너지학회논문집
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• 제24권6호
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• pp.558-565
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• 2013

This paper presents how to determine AEP(Annual Energy Production) by a small wind turbine in DuckjeokDo island. Evaluation of AEP is introduced to make a self-contained island including renewable energy sources of wind, solar, and tidal energy. To determine the AEP in DuckjeokDo island, a local wind data is analyzed using the annual wind data from Korea Institute of Energy Research firstly. After the wind data is separated in 12-direction, a mean wind speed at each direction is determined. And then, a small wind turbine power curve is selected by introducing the capacity of a small wind turbine and the energy production of the wind turbine according to each wind direction. Finally, total annual wind energy production for each small wind turbine can be evaluated using the local wind density and local energy production considering a mechanical energy loss. Throughout the analytic study, it is found that the AEP of DuckjeokDo island is about 2.02MWh/y and 3.47MWh/y per a 1kW small wind turbine installed at the altitude of 10 m and 21m, respectively.

• 전기학회논문지
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• 제64권8호
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• pp.1168-1179
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• 2015

This paper presents voltage and frequency control methods for a stand-alone Gasa Island Microgrid in South Korea that can be fully energized by renewable energy resources such as photovoltaic systems and wind turbines. To mitigate the variations of the output of renewable energy resources and supply more reliable electricity to customers, battery energy storage systems (BESSs) are employed in the stand-alone microgrid. The coordination between BESSs and pre-existing diesel generators is an important issue to manage the microgrid more securely. This paper presents voltage and frequency control schemes considering the coordination of BESSs and DGs. The effectiveness for the operating method is validated via simulation studies.

• 신재생에너지
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• 제7권2호
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• pp.51-58
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• 2011

Saemankeum is well known for its high speed wind, and it is known that the blueprint of a future city around Saemankeum, including new industrial complex, has been planned. As a result, large-scale offshore wind farm, on the basis of the measurement of wind resource for a long time, can be considered, so that generated electricity can be used to meet the energy demand near the wind farm. Wind speed in Kokunsando of Saemankeum is measured and analyzed with its statistical distribution and wind directions. The probability of wind power resource over Kokunsando of Saemangeum is reviewed with the measured data in one island of Kokunsando. According to measured data, the shape and scale factor of Weibull distribution of wind speed are obtained, and then power density is analyzed as well. Through this study, it is clear that the Saemangeum area has a fluent and abundant wind power source to develop the wind farm in Korea.

• 전기학회논문지
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• 제64권2호
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• pp.222-227
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• 2015

This paper presents the optimal energy generation systems for economical EVs(Electric Vehicles) charging stations located in an island area. The system includes grid electricity, diesel generator and renewable energy sources of wind turbines and PV(Photovoltaic) panels. The independent generation system is designed with data resources such as annual average wind speed, solar radiation and the grid electricity price by calculating system cost under different structures. This sensitive analysis on the varying data resources allows for the configuration of the most economical generation system for charging stations by comparing initial capital, operating cost, NPC(Net Present Cost) and COE(Cost of Energy). Depending on the increase of the grid cost, the NPC variation of the most economical system which includes renewable energy generations and grid electricity can be smaller than those of other generation systems.

• 한국신재생에너지학회:학술대회논문집
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• 한국신재생에너지학회 2010년도 춘계학술대회 초록집
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• pp.184.1-184.1
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• 2010

In order to research the way to evaluate wind resource without actual Met Mast data, this paper has been carried out on the southeastern region of Jeju island, Korea. Although wind turbine has been an economical alternative energy resource, misjudging the prediction of lifetime or payback period occurs because of the inaccurate assessment of wind resource and the location of wind turbine. Using WindPRO(Ver. 2.7), a software for wind farm design developed by EMD from Denmark, wind resources for the southeastern region of Jeju island was analyzed, and the performance of WindPRO prediction was evaluated in detail. Met Mast data in Su-san 5.5Km far from Samdal wind farm, AWS in Sung-san 4.5km far from Samdal wind farm, and Korea Wind Map data had been collected for this work.