• 반도체디스플레이기술학회지
• /
• 제17권3호
• /
• pp.10-16
• /
• 2018

In silicon crystalline PV (Photo Voltaic) industry, PV module or panel electric power is directly related to the companies' profit. Thus, many PV companies have invested and focused on R&D activities to get the higher module power. The main BOM (Bills of Material) on the module consists of PV solar cell, ribbon, EVA (Ethylene-Vinyl Acetate copolymer), glass and back sheet. Based on consistent research efforts on enhancing module power using BOM, there have been increase of around 5 watt per module every year as results. However, there are lack of studies related to enhancing accuracy of measurement. In this study, the enhancing on the metrology is investigated and the improvement shows actually contribution to company's profit. Especially, the measurement issues related to heat and to quasi state of bandgap diagram by EL(Electro Luminescence) are described in this study.

• 조명전기설비학회논문지
• /
• 제28권8호
• /
• pp.106-112
• /
• 2014

This paper presents the analysis of connected operation of photo voltaic source and Li energy storage system. The micro-grid has been installed and operated for several years at the campus of USF and has been a role of test bed. Photo voltaic source has been strongly influenced by the location, weather and climate of a installed area and Li battery is connected directly to the photo voltaic source to compensate for the limitations. The Li battery is operated to supply power output to the grid by the charging or discharging mode based on the average power output of the PV source which is calculated from monitored data for several years. The load of the PV and Li battery system is operated as a severe loading condition and the operating characteristics of PV source and Li battery are analyzed in detail. In connected operations of PV and Li battery to power system, the PV and Li battery is operated to supply constant power during only day time or peak time to increase load shedding ratio and efficient usage of generation sources in power system.

• 전기학회논문지
• /
• 제65권10호
• /
• pp.1682-1687
• /
• 2016

Approximately 520thousand elevators are operating now in Korea, about 40% ~ 60% of the elevator power is generated. In this paper, by using the method of adding regeneration power of the elevator to the grid-tied photo voltaic inverter, PV generation that was dependant on the solar radiation was significantly improved. In order to confirm this, the regeneration power of the elevator has been simulated in 12% of the rating load, and measured the regeneration power of the elevator in the actual condition to assess the differences of it. The 5[kW] hybrid grid-tied photo voltaic invertor has been fabricated to conduct an experiment for the confirmation of the proposing method. The effectiveness of the proposing method has been reassured with the result of experiment that include the transfer interface part of the regeneration power of the elevator.

• 한국태양에너지학회:학술대회논문집
• /
• 한국태양에너지학회 2012년도 춘계학술발표대회 논문집
• /
• pp.445-450
• /
• 2012

BIPV/T (Building Intergrated PhotoVoltaic/Thermal) is combined system produces electricity and thermal energy. The heat from PV modules should be removed for better electrical performance, and can be converted into useful thermal energy. The efficiency of the PV system's performance will raise by the system removes heat from the PV. The test system is installed to top floor of the experimental house in the KEPCO Research Institute. The planned experiment is following. (1) Supplying heat energy to top floor. (2) Supplying heat and cool energy to thermal storage in the bottom of the top floor. (3) Supplying heat energy to EHP for improved performance. The experimental performance is executed from 13th February to 13th March, 2012. The solar generation of electricity is 4.04kWh under the horizontal solar radiation is $1000W/m^2$ and the air temperature is $25^{\circ}C$.

• 한국가시화정보학회지
• /
• 제19권1호
• /
• pp.18-27
• /
• 2021

As the photo-voltaic (PV) industry grows, the floating PV has been suggested to resolve current environmental destruction and a lack of installation area. Currently, various floating PV systems have been developed, but there is a lack of studies on how the shape of the floating body and other compositions are affecting structural behavior. In this study, the behavior of the floating PV was investigated at the various length of mooring lines, stiffness of connecting hinges, and size of floating bodies. The shortest mooring lines with the distributed type floating PV showed the least force on the floating body and corresponding motion. A frictionless hinge is safer at the regular and low-height wave, while a stiff hinge is safer at irregular and high-height wave. In addition, due to the bi-axial distribution of the connecting hinge, 45° direction wave was found to be the most dangerous.

• 전기학회논문지
• /
• 제67권3호
• /
• pp.448-453
• /
• 2018

PV module protective film plays an important role in protecting the solar cell from external environment by anti-hydrolysis polyester, UV resistance and mechanical properties. The backsheet was manufactured by using Roll-to-Roll dry laminating process. The backsheet structure is composed of 3 layers, which are PE, PET, and Fluorine polymer films. In this study, we have experimented the variation of thermal conductivities depending on MgO inputs 10% to 25% in order to confirm the dependence of the module efficiencies. High thermal conductive backsheet can increase the module output power efficiency because the heat is dissipated by spreading out the internal heat. Long-term environment weatherability tests were conducted for confirming 25 year reliability in the field such as PCT, UV, and power efficiency degradations. As the evaluation result, high thermal conductivity can be effective for increase of power efficiency of solar panel by using thermal conductive MgO masterbatch.

• 조명전기설비학회논문지
• /
• 제27권5호
• /
• pp.67-73
• /
• 2013

The conversion of solar radiation into electrical energy by Photo-Voltaic (PV) effect is a very promising technology, being clean, silent and reliable, with very small maintenance costs and small ecological impact. The output power produced by the PV panels depends strongly on the incident light radiation. The continuous modification of the sun-earth relative position determines a continuously changing of incident radiation on a fixed PV panel. The point of maximum received energy is reached when the direction of solar radiation is perpendicular on the panel surface. Thus an increase of the output energy of a given PV panel can be obtained by mounting the panel on a solar tracking device that follows the sun trajectory. Tracking systems that have two axes and follow the sun closely at all times during the day are currently the most popular. This paper presents research conducted into the performance of Solar tracking system with photosensors. The results show that an optimized dual-axis tracking system with photosensor performance and analysis. From the obtained results, it is seen that the sun tracking system improves the energy and energy efficiency of the PV panel.ti-junction CPV module promises to accelerate growth in photovoltaic power generation.

• 한국지능시스템학회논문지
• /
• 제26권5호
• /
• pp.351-360
• /
• 2016

Rapid population growth with high living standards and high electronics use for personal comfort has raised the electricity demand exponentially. To fulfill this elevated demand, conventional energy sources are shifting towards low production cost and long term usable alternative energy sources. Hybrid renewable energy systems (HRES) are becoming popular as stand-alone power systems for providing electricity in remote areas due to advancement in renewable energy technologies and subsequent rise in prices of petroleum products. Wind and solar power are considered feasible replacement to fossil fuels as the prediction of the fuel shortage in the near future, forced all operators involved in energy production to explore this new and clean source of power. Presented paper proposes fuzzy logic based Energy Management System (EMS) for Wind Turbine (WT), Photo Voltaic (PV) and Diesel Generator (DG) hybrid micro-grid configuration. Battery backup system is introduced for worst environmental conditions or high load demands. Dump load along with dump load controller is implemented for over voltage and over speed protection. Fuzzy logic based supervisory control system performs the power flow control between different scenarios such as battery charging, battery backup, dump load activation and DG backup in most intellectual way.

• 해양환경안전학회지
• /
• 제18권3호
• /
• pp.287-293
• /
• 2012

본 연구는 수산 폐기물인 굴패각을 공조시스템의 수분 흡착제로 사용하기 위한 가능성을 실험을 통해 살펴본 기초적인 연구이다. 연구의 주된 목적은 굴패각의 제습성능과 열전소자의 냉각효과를 파악하는 것이며 본 연구를 통해 굴패각은 공조시스템 내에서 사용가능한 수분 흡착제로서의 성능을 충분히 가지고 있으며, 또한 냉각효과를 통해 흡착성능을 크게 향상시킬 수 있다는 것을 알았다. 본 시스템은 신재생에너지인 태양광을 이용하기 때문에 시스템의 구동에 필요한 다른 전원은 필요 없어 환경적으로도 매우 바람직한 연구이다.

• Korean Chemical Engineering Research
• /
• 제58권3호
• /
• pp.416-423
• /
• 2020

대부분의 태양광 발전시설물은 평지에 설치가 되는 것이 일반적이지만 소형 발전시설의 경우는 경사진 임야 등에 설치되는 경우도 많다. 그 외에는 드물게 건물의 옥상이나 콘크리트 위에 설치되는 경우가 있으나 이는 대부분 25 kW 미만의 소규모 설치이다. 일반 평지나 임야 등에 설치가 될 경우 관리를 지속적으로 하지 않으면 잡초가 자라고 일정 높이 이상 자라게 된 잡초는 태양광 모듈에 그림자의 영향을 줄 수 있게 된다. 그러나 잡초가 조금 자란 것이 영향을 주는지 주지 않는지 판단하기 힘들고 지속적인 관리를 위해서는 관리 비용이 발생하기 때문에 잡초가 태양광 발전에 영향을 주는 시점에서 정확하게 관리를 해준다면 가장 최소한의 관리비용으로 최대한의 태양광 발전량을 가져 올 수 있을 것으로 판단된다. 본 연구에서는 잡초가 의한 태양광 모듈의 발전에 영향을 미치는 형태를 모니터링을 통한 발전량 데이터를 분석하여 그 유형을 파악을 하고 모듈에서 잡초의 그림자 영향이 출력의 감소에 어떠한 영향을 주는지 실험을 통해 분석하였다. 이를 바탕으로 잡초의 영향을 모니터링 데이터 상의 수치로 기준을 정하였다. 또한 잡초의 영향을 장기적으로 방치를 하였을 경우 나타나게 되는 현상인 핫스팟(Hot spot) 발생의 기준을 수치적으로 표준화 하였다.