• Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
• /
• v.22 no.1
• /
• pp.132-140
• /
• 2008

Power system of Jeju is interconnected to the mainland using HVDC and that is also interconnected two wind farms. Control of Jeju power system will be difficult if HVDC is disconnected or HVDC is overhauled under large scale wind farms interconnected. We measured and analysed the power quality of two substation and two wind farms to assess that wind farms and HVDC overhaul have an effect on Jeju system or not during the HVDC overhaul. We found that the frequency of Jeju system is very unstable and the voltage distortion excess the limitation. Harmonic currents of wind farms flew into Jeju system in proportion to the power of wind turbine. And the voltage of nearby distribution line was distorted by power of wind turbine when the amount is more that 3,000[kW].

• Journal of the Korean Society for Aeronautical & Space Sciences
• /
• v.37 no.11
• /
• pp.1121-1130
• /
• 2009

In order to investigate the offshore wind resources, the measured data from the QuikSCAT satellite was analyzed from Jan 2000 to Dec 2008. QuikSCAT satellite is a specialized device for a microwave scatterometer that measures near-surface wind speed and direction under all weather and cloud conditions. Wind speed measured at 10 m above from the sea surface was extrapolated to the hub height by using the power law model. It has been found that the high wind energy prevailing in the south sea and the east sea of the Korean peninsula. From the limitation of seawater depth for piling the tower and archipelagic environment around the south sea, the west and the south-west sea are favorable to construct the large scale offshore wind farm, but it needs efficient blade considering relatively low wind speed. Wind map and monthly variation of wind speed and wind rose using wind energy density were investigated at the specified positions.

• Journal of the Korean Society of Marine Environment & Safety
• /
• v.25 no.6
• /
• pp.658-665
• /
• 2019

Among the renewable energy resources, wind power is growing rapidly in terms of technological development and market share. Recently, onshore wind farm have been affected by limitations of terrestrial space and environmental problems. Consequently, installation sites have been moved to the sea, and the development of floating offshore wind farms that are installed at deep waters with more abundant wind conditions is actively underway. In the context of maritime traffic, the optimal site of offshore wind farms is required to minimize the interference between ships and wind turbines and to reduce the probability of accidents. In this study, genetic algorithm based AIS(Automatic Indentification System) data composed of genes and chromosomes has been used. The optimal site of floating offshore wind farm was selected by using 80 genes and by evaluating the fitness of genetic algorithm. Further, the final site was selected by aggregating the seasonal optimal site. During analysis, 11 optimal site were found, and it was verified that the final site selected usng the genetic algorithm was viable from the perspective of maritime traffic.

• Journal of the Korea Society for Simulation
• /
• v.32 no.3
• /
• pp.33-41
• /
• 2023

As carbon-free has been getting interest, renewable energy sources have been increasing. However, renewable energy is intermittent and variable so it is difficult to predict the produced electrical energy from a renewable energy source. In this study, digital-twin concept is applied to solve difficulties in predicting electrical energy from a renewable energy source. Considering that rotation of wind turbine has high correlation with produced electrical energy, a model which simulates rotation in the drivetrain of a wind turbine is developed. The base of a drivetrain simulation model is set with well-known state equation in mechanical engineering, which simulates the rotating system. Simulation based machine learning is conducted to get unknown parameters which are not provided by manufacturer. The simulation is repeated and parameters in simulation model are corrected after each simulation by optimization algorithm. The trained simulation model is validated with 27 real wind turbine operation data set. The simulation model shows 4.41% error in average compared to real wind turbine operation data set. Finally, it is assessed that the drivetrain simulation model represents the real wind turbine drivetrain system well. It is expected that wind-energy-prediction accuracy would be improved as wind turbine digital twin including the developed drivetrain simulation model is applied.

• The Journal of the Korea institute of electronic communication sciences
• /
• v.10 no.8
• /
• pp.935-944
• /
• 2015

This study performs the dynamic modeling and the simulation of variable speed wind power system and implements the models of wind speed, wind turbine & PMSG, and MPPT & pitch control as well. The simulation of wind turbine was performed by using the power coefficient and other simulation parameters which were extracted with reference to the commercial 5MW class wind turbine data. As the result of this simulation, MPPT control is confirmed, maintaining the maximum power coefficient as far as the rated speed 12[m/s]. Over 12[m/s] wind speed, this wind power system makes it possible to keep the stable output by controlling the pitch angle.

• Proceedings of the Computational Structural Engineering Institute Conference
• /
• 2010.04a
• /
• pp.200-206
• /
• 2010

본 논문은 풍력발전 시스템의 하부 지지 구조물인 타워의 플랜지 연결부 설계 평가를 위한 플랜지 모델건전성 평가 기법에 대해 다룬다. 일반적으로 풍력발전 시스템 타워의 연결부는 Ring-형 플랜지의 형태를 가지고 있다. 이러한 ring-형 플랜지에 대한 설계 기준 및 방법은 풍력 발전 시스템 기술기준 등 에 명시되어있다. 이러한 설계 기준을 따르는 플랜지 연결부에 대해 구조 및 체결 볼트의 건전성 평가를 위해 하중평가 전용 프로그램인 GH-Bladed 3.8를 통해 생성된 하중 데이터를 유한요소 범용 프로그램인 Ansys 12.0에 접목하여 구조해석을 수행 하였다. 해석 방법은 풍력발전시스템의 타워를 셸 요소로 모델링하여 계산한 해석 결과를 플랜지 모델의 경계면에 적용 시켜 해석하는 submodeling 기법과 타워를 빔의 형태로 단순화 화여 계산한 거동 결과를 플랜지 모델에 적용하는 기법을 사용 하였다. 이 두 가지의 해석 기법으로 도출된 결과의 비교를 통하여 해석 결과 신뢰성을 평가하고 효율적이고 합리적인 방법을 제시하고자 하였다.

• Journal of the Korean Association of Geographic Information Studies
• /
• v.17 no.4
• /
• pp.86-100
• /
• 2014

The purposes of this study are to provide a guideline for the suitability of wind farm facilities in forest lands and to suggest improvement plans of policies and systems to minimize the damage of forest lands. First, we implemented a literature review and field surveys to examine and select factors for the suitability of wind farm facilities in forest lands. Spatial database for selected location factors of wind farm facilities in forest lands was constructed to develop the suitability model for locating wind farm facilities focusing on Gangwon-do. Data used in this study include wind power resource, legal mountainous preserved area, forest roads, developed areas, forest class, and other spatial data. In order to find specific-sized potential areas for a certain number of wind farm turbines, we used block statistics and focal statistics methods. As a result, the areas for potential wind farm locations were 1,261ha from a block statistics method and 1,411ha from a focal statistics method. Based on the outputs of this research, it is required to make an urgent solution for the prevention of forest disaster and to prepare reduction measures for the destruction of ridge landscape.

• 한국신재생에너지학회:학술대회논문집
• /
• 2005.11a
• /
• pp.205-218
• /
• 2005

본 연구는 IEC 규정에 의거해 6kw급 소형풍력발전기 성능실증연구를 수행하였다. 실증연구를 수행하기 위하여 풍력발전기에 각종 센서를 설치, 측정 사이트에 모니터링 시스템을 구성하여 데이터를 수집 분석하였다.

• Proceedings of the KIEE Conference
• /
• 2008.11a
• /
• pp.488-490
• /
• 2008

지구 온난화 및 에너지 위기에 대비하여 신재생 에너지의 비율이 점점 증가하고 있고 이에 따라 전력계통의 운영 환경도 이에 따라 변하고 있다. 특히 풍력의 경우에는 현재에도 대용량이 계통에 연계가 되어 운전이 되고 있기 때문에 풍력발전기의 계통에 미치는 영향에 대한 연구는 이전부터 진행이 되어 왔다. 본 연구에서는 EMTDC를 이용한 시뮬레이션을 통해 이전에 수행한 PSS/E의 연구 결과와 비교 분석하여 그 차이점에 대해서 분석하고 일관된 결과를 얻기 위한 계통의 데이터 및 시뮬레이션 조건에 대해서 생각해 보았다.

• Proceedings of the KIPE Conference
• /
• 2006.06a
• /
• pp.194-196
• /
• 2006

본 논문은 신재생에너지 분야 중 태양광/풍력발전시스템의 모니터링에 관한 것으로서, 500W 태양광 발전시스템 1기와 풍력발전시스템 2기를 각각 설치하고, LabVIEW를 이용하여 원격 모니터링 시스템을 구축한 후, 이를 이용하여 동시 다채널 모니터링 하는 것에 관한 것이다. 모니터링을 위하여 각 시스템 별로 센서를 부착하고, 출력되는 아날로그 데이터를 실시간으로 네트워크를 통하여 모니터링 함으로써 각 발전원별 출력특성을 분석하고자 하였다.