• Proceedings of the KIEE Conference
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• 2005.10c
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• pp.257-260
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• 2005

A very complicated real system can be simulated using hardware-in-the-loop (HIL) system in a virtual environment. Therefore, HIL system can speed up research and development process with a little effort. Also, current DSP for utility interactive photovoltaic generation system adopts floating point process type, which is easy to use for number crunching. However, fixed point process DSP, TMS320F2812, has high control speed and is rather inexpensive. This paper presents more efficient method for MPPT control using TMS320F2812 along with HIL system.

• Proceedings of the Korea Water Resources Association Conference
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• 2023.05a
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• pp.442-442
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• 2023

IEA에 따르면 2040년까지 4,000GW이상의 신재생에너지 신규 설비 증설이 이루어져 2040년에는 전체 발전 용량의 46%를 신재생에너지가 차지할 것으로 전망되며, BNEF는 2040년까지 10.2조달러 규모의 전 세계 발전 부문 투자 가운데 7.4조 달러가 신재생에너지에 집중될 것으로 전망하고 있다. 반면 국내 신재생에너지 시장은 규모와 내용면에서 세계 시장과 큰 격차를 보이고 있다. 2016년 기준 신재생에너지 설비 용량은 약 13.8GW이며, 정부의 재생에너지 보급 목표량은 2034년 기준 80.8GW로 매우 협소한 시장이 될 것으로 보인다. 이에 본 연구에서는 국내 신재생에너지 기업들의 해외시장 진출을 위해 지리적·기술적 관점에서 투자 가능성이 높은 인도네시아 재생에너지 시장, 특히 수상태양광 시장의 현황 및 전망에 관하여 검토, 제시하고자 한다.

• Proceedings of the Korea Water Resources Association Conference
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• 2023.05a
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• pp.79-79
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• 2023

국제사회는 신기후체제 출범(COP21, '15)을 통해 선진국뿐만 아니라 개도국에도 2020년부터 탄소감축 의무를 부과하고 있다. 이에 우리나라와 경제적으로 밀접한 동남아시아 국가에서는 신재생에너지 분야에 대한 관심이 매우 높다. 예로써 말레이시아에서는 신재생에너지 비중을 2025년 31%, 2035년에는 40%까지 제고시키다는 계획이며, 인도네시아는 2070년 완전한 탄소중립 달성을 목표로 태양광 및 바이오에너지 비중을 확대하고 있다. 특히 수상태양광은 댐 수면을 활용함에 따라 입지의 영향이 적고 최적부지 확보가 용이하다는 이유에서 기존 지상 태양광의 문제점을 해소하는 대안으로 부상하고 있다. 이에 본 연구에서는 지리적·기술적 여건의 관점에서 향후 시장 성장성이 클 것으로 판단되는 동남아시아 주요 협력국가를 대상으로 전력 동향 및 향후 발전 전망 등을 분석함으로써 수상태양광 분야의 전략적 타겟시장을 선정, 제시하고자 한다.

• Korean Journal of Ecology and Environment
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• v.52 no.4
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• pp.293-305
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• 2019

In this study we investigated the effect of a floating photovoltaic (FPV) system in Cheongpung Lake on water quality. The FPV with a tilt angle of 33° covered ca. 0.04% of surface area (97 ㎢) of Chungju Lake. The water qualities of the whole lake before and after installation of FPV were first compared. DO, BOD, TOC, and Chl-a of the whole lake were increased, while conductivity decreased after installation period at the significance level of 0.05. This change was probably due to the increased influx of nutrients by 40% resulting from increased precipitation during the same period. We also measured water quality parameters on May and Nov. 2017 at the FPV center (FPVC) and nearby control sites, and compared water quality. The result showed that the FPVC and nearby sites were not significantly different (p>0.05), demonstrating that the FPV does not cause a decline of water quality. The water temperature, light intensity, and phytoplankton community were also measured. The water temperature was not different between the sites, while the light intensity decreased to 27~50%. Despite reduced light intensity at FPVC, the phytoplankton standing crops and the number of species were not significantly different (p>0.05). However, in the early November samples, standing crops was significantly higher in FPVC than control with periphytic diatoms belonging to Aulacoseira genus being dominant. This may be due to the temporal water body behavior or local retention of current by FPV system. This study may provide a measure of future installation of a FPV system.

• Proceedings of the Korea Water Resources Association Conference
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• 2016.05a
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• pp.175-179
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• 2016

수상 태양광 발전시설은 댐이나 호소, 저수지의 잉여공간인 수면역에 설치하여 수위 변동에 대응하고 육상 대비 발전효율이 높은 발전시스템이지만 수상 태양광 발전시설의 설치로 인하여 수질오염 및 수생태계 교란을 야기할 수 있다는 우려가 지속적으로 대두 되고 있다. 본 연구는 안성시에 위치한 금광저수지 내 수상회전식 태양광 발전시설의 모니터링을 통해 발전시설의 설치가 수질에 미치는 영향을 파악하고자 하였다. 본 연구에서는 수상회전식 태양광 발전시설로 인하여 차광이 되는 차광구역 6지점과 그 외 비차광구역 4지점을 선정하여 차광으로 인한 수질의 변화를 알아보고자 하였다. 연구 결과 수상회전식 태양광 발전시설의 설치로 인하여 수체의 차광 및 광에너지 저하로 인한 수질 및 조류 농도의 변화는 통계학적으로 유의할 정도(p<0.05)의 수준은 아닌 것으로 판명되었다.

• Journal of the Korean Solar Energy Society
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• v.40 no.4
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• pp.13-22
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• 2020

As the supply of photovoltaic (PV) increases worldwide, the cumulative installations in 2018 were 7.9 and 560 GW in Korea and the world, respectively. Typically, when the ground on commercial PV modules is installed, the area is limited; hence, new designs of PV modules are required to install additional PVs. Among the new design of PV modules, lightweight PV modules can be utilized in PV systems, such as buildings, farmlands, and floating PV. Concerning the investigation of lightweight PV modules, several studies on materials for replacing low-iron tempered glass, which comprises approximately 65% of the PV module weight, have been conducted. However, materials that are used as substitutes for glass should possess similar lightweight properties and reliability as glass. In this study, experimental tests were performed to evaluate the applicability of ethylene tetrafluoroethylene (ETFE) film with excellent resistance to water and aging as a front material of PV modules. The transmittance and ultraviolet properties of the ETFE film were determined and compared with those of glass. A 1-cell module and laboratory-scale 24-cell module were manufactured using the ETFE film and glass, and the electrical output was measured and analyzed. Furthermore, damp heat and thermal cycle tests were conducted to evaluate the reliability of the ETFE film module. Based on the experimental results, the electrical output and reliability of the ETFE film module were similar to those of the glass module, and the ETFE film could be used as the front material of PV modules.

• Journal of the Korean Solar Energy Society
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• v.39 no.5
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• pp.1-10
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• 2019

Recently, the installation capacity of PV (photovoltaic) systems has been increasing not only field installation but also floating PV, farm land, BIPV/BAPV. For this reason, the new design and materials of PV module are needed. In particular, in order to apply a PV system to a building, lightweight of the PV module is essential. PV modules made of generally used texturing glass are excellent in output and reliability, but there is a limit to the weight that can be reduced. For the lightweight of the PV module, it necessary to use a film instead of a glass. However, the application of film rather than a glass may cause various problems such as decrease in photocurrent by decrease in transmittance and a increase of CTM (cell to module) loss, a degradation of the reliability, and so on. In this paper, PV modules using Ultra barrier film, which is recently a lot of interest as a substitute for a glass, its characteristic analysis and reliability test were conducted. The transmittance and UV characteristics of each material were verified, and the output of the fabricated 1 cell PV module was measured. In addition, 24 cell PV modules were fabricated at the lab-scale and its reliability tests were conducted. As a result of the experiment, the reliability characteristics of the ultra barrier film PV module were excellent, and it was confirmed that it could be used as the front material of the PV module instead of glass