PURPOSES : Safety Evaluation of Wind Loads of Renewable Energy and Photovoltaic Power Structures. METHODS : Structural safety evaluation was conducted on the wind load of 3kW Photovoltaic Power Structures using ABAQUS. Wind speed was reviewed for 36m/s and 60m/s. Effective Mass and Mass Contribution of Photovoltaic Power Structures was utilized up to 90%. 7 steps were set and applied to structural analysis. RESULTS : As a result of the structural analysis, it was confirmed that the long-term blowing load was affected rather than the size of the wind load. Weak areas were identified at the point of the horizontal beam rather than the modules of the Photovoltaic Power Structures. In particular, it was confirmed that stress exceeding the allowable stress was generated at the junction. In order to secure the safety of Photovoltaic Power Structures, it is judged that reinforcement of the branch is necessary. CONCLUSIONS : The safety of Photovoltaic Power Structures structures for wind load is influenced by persistence rather than the size of the wind load. Therefore, in order to prevent this, it is judged that reinforcement of the branch is necessary.

Offshore wind power development has been promoted in countries around the world to cope with global warming. Despite its many advantages, offshore wind power affects the marine environment during construction and operation. As a result, the reduction of fishing areas, changes in the habitat of marine animals, damage to fishing gear, and impeding the safety of fishing activities are occurring. If the offshore wind power generation project is carried out, a fishing damage investigation is nescssary. There are only four fishing damage investigations related to offshore wind power, which are being conducted similarly to the existing fishing damage investigation related to offshore construction. Therefore, this study reviewed and analyzed the report on fisheries damage investigation related to offshore wind power conducted in Korea and suggested problems and improvement measures accordingly.

This study is to propose ways to improve the system for rational procedures for offshore wind power generation projects. The results of this study are summarized as follows. In order to quickly distribute and develop offshore wind power projects, the permitting period should be shortened through special laws, the government actively intervenes to support the formation and operation of privat-public councils to ensure residents' acceptance. In this way, it can be competitive in the future energy market. Above all, a special law (proposal) related to offshore wind power currently pending in the National Assembly should be passed as soon as possible. Finally, the government and local governments that manage public waters should provide active administrative support based on system improvement measures in consideration of these permits, and the project’s main body should minimize damage to the marine environment and ecosystem. Through these subject-specific roles, offshore wind power generation will be able to reduce carbon emissions and help establish a sustainable energy production system.

This paper is to study the technology of inspection and history management systems for wind power that are continuously increasing around the world. In the past, inspections and analysis of major devices in renewable energy system have been operated in an analog way that identifies problems through photography and passive method. To improve this problem, we conduct a study on VR-based inspection history management system using 3D texturing technique of drone image. The paper describes the current status and prospects of wind power, research and development of wind power blade inspection and history management systems, experiments and reviews in the field, and expected effects and future utilization of this technology. It is expected that the latest technology for inspection and management of renewable system will be secured and introduced to the site through the development research of this system to reduce maintenance costs and power generation costs.

타워형 집광태양열발전의 핵심요소인 헬리오스타트는 경량화를 통한 설비비 저감이 매우 중요한다. 반사판 면적 16m2의 기 존 헬리오스타트 대비 샌드위치 패널을 사용하여 무게를 50% 경량화한 헬리오스타트의 풍하중 평가를 수행하였다. 반사판이 수직, 45 도 경사인 경우에 대해 전산유체역학 해석을 하여 반사판에 작용하는 풍압을 산정하고 구조해석을 수행하여 최대응력의 발생부위 및 반사판의 변위에 의한 반사각도의 이격을 계산하였다. 45도 경사진 반사판이 바람이 불어오는 반대편으로 향한 경우가 바람을 마주보 는 배치보다 최대 풍하중이 더 크게 나타났으며, 반사판 풍하측으로의 유동박리에 의한 후류의 발달도 반사판의 배치에 따라 매우 상 이한 형태를 보였다. 경량화 모델의 경우 반사판 구동을 위한 기어의 배치를 변경하여 핵심 지지체인 기둥의 강성을 확보할 필요가 있 음을 확인하였다.

This study was conducted to investigate the effects of underwater noise caused by pile driving during marine construction on fish. In this study, the three gray rockfish were released about 1 km away from the construction site of wind power generation on July 18, 2018 and traced using two acoustic telemetry techniques. The behavior of the fish was analyzed by calculating the moving distance, swimming speed and direction of the gray rockfish. In the results of the acoustic tracking using the ship, the rockfish moved about 2.11 km for about two hours at a speed of 0.28 ± 0.14 m/s (0.94 TL/s). The bottom depth of the trajectory of the rockfish was 1.0 ± 0.6 m on average. There was a significant directionality in swimming direction of the gray rockfish, and there was no significant correlation between the swimming direction and tidal current direction. Moving distance during 5 minutes (5MD) during pile driving and finishing operations between rock surface and bedrock were 0.94-0.96 times (76.0-77.0 m) and 1.81-2.73 times (146.0-219.5 m), respectively, compared with no pile driving. This study is expected to be used as a basic data of fish behavior research on underwater noise.

In this study, the yaw misalignment value of wind turbine was measured using Lidar and it was analyzed the effect of vibration reduction and power performance improvement when applied to turbine. It was confirmed that the vibration of the main bearing and the gear box of the wind turbine was partially reduced. Also it was found that the output performance was improved when the wind speed was over 8m/s. As a result, it was also found that the annual energy production(AEP) was improved when the average annual wind speed of the wind farm was over 6m/s. Converted to AEP, the AEP improved about 1% and 4%, when the annual wind speed was 6m/s and 11m/s respectively, which resulted in an improvement of about 1~4% through the yaw misalignment correction of the wind turbine.

고리 원자력발전소 1호기 폐쇄 후 잉여 계통접속 용량을 활용한 해상풍력단지를 개발함에 있어서, 본 논문은 해안 단기간 라이다 측정자료를 이용한 해상 풍력자원평가 방법을 제시하였다. 이를 위해 전산유체역학을 이용한 복잡지형에서의 라이다 측정오차 보정, 제3세대 재해석자료를 이용한 장기간 보정, 그리고 후류모델에 따른 발전량 예측오차를 분석하였다. 해안 평탄지형에서 라이다 측정이 수행되었기 때문에 복잡지형 보정오차는 풍속 MAE로 0.03m/s에 불과하였으나 최종 연간에너지생산량은 미보정시에 비해 10% 의 차이가 발생하였다. 특히 장기간 보정과 해안 기상자료를 해상 기상자료로 전달하는 과정의 불확도가 큰 것으로 평가되었다. 풍력 터빈 이격거리가 충분할 경우 기존 육상풍력용 후류모델은 후류손실이 없다고 예측한 반면 심층배열 후류모델은 6%의 후류손실을 예 측하였다. 정리하자면 해상풍력사업의 불확도 최소화를 위해서는 해상기상탑을 설치하고 장기간 측정을 수행하는 것이 필수적임을 재확인하였다.

Recently, various building integrated wind power (BIWP) approaches have been used to produce energy by installing wind power generators in high-rise buildings constructed in urban areas. BIWP has advantages in that it does not require support to position the turbine up to the installation height, and the energy produced by the wind turbine can be applied directly to the building. The accurate evaluation of wind speed is important in urban wind power generation. In this study, a wind tunnel test and computational fluid dynamics (CFD) analysis were conducted to evaluate the wind speed for installing wind turbines between buildings. The analysis results showed that the longer the length of the buildings, which had the same height, the larger the wind speed between the two buildings. Furthermore, the narrower the building’s width, the higher the wind velocity; these outcomes are due to the increase in the Venturi effect. In addition, the correlation coefficient between the results of the wind tunnel test and the CFD analysis was higher than 0.8, which is a very high value.

This research is to study on the optimum design of the wind power generation blade with three different shapes of the wind turbine blade and three air input speeds (7, 10, 15m/s). In order to perform this numerical analysis, velocity, pressure, and temperature distributions of fluid over the flow domain of the turbine blade and also pressure coefficient and ratio of the Lift to Drag force are numerically calculated for the best design shape of blade using commercial CFD code. Finally, the energy-efficient and optimum shape of the wind turbine for power generation are determined with the sequence of case1, case2, and case3.

As an offshore wind power turbine is bigger, a new-type supporting structure is required reduce any probability of risk such as its buckling failure. In this study, we analyzed free oscillation of ICH RC wind power tower based on the design sections in the previous study. Also, we checked the safety by resonance between designed ICH RC wind power towers and various commercial wind power turbines. The eigenvalue analysis results showed that the designed ICH RC wind power towers were free from the resonance by turbines.