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Photovoltaic module의 발전 온도에 따른 EVA 광 특성 연구
우성철(Woo Sung-Cheol),정태희(Jung Tae-Hee),민용기(Min Youn-Ki),강기환(Kang Ki-Hwan),안형근(Ahn Hyeung-Ken),한득영(Han Deuk-Young) 한국태양에너지학회 2011 한국태양에너지학회 학술대회논문집 Vol.2011 No.4
Photovoltaic modules are well known to be one of the most eco generation of electricity. But usually study solar cell. Otherwise. PV modules are also important in power generation. We have to check other subsidiary materials. In this work benefit of using optically superior encapsulation materials (EVA) in generation temperature is demonstrated. Optical characterization of three EVA products demonstrates reduced transmission in the visible ray region of the solar spectrum. It will have a decisive effect to the module efficiency. Test is shown reduction of reflectance and transmittance. Reflections is dependent on the low iron glass. It can be seen between a specific wavelength(240~350㎚) about 1%. Transmittance in the entire ray region of light is markedly reduced to depending on the temperature rise. The graph is shown optical properties on EVA. Transmission was reduced. about 1%.
결정질 Si Wafer의 thickness에 따른 열 전도 특성에 관한 연구
우성철(Woo Sung-Cheol),정태희(Jung Tae-Hee),윤나리(Yoon Na-Ri),강기환(Kang Ki-Hwan),안형근(Ahn Hyeung-Ken),한득영(Han Deuk-Young) 한국태양에너지학회 2010 한국태양에너지학회 학술대회논문집 Vol.2010 No.11
Now days, the cost of raw materials has been rising. And the solar industry worry about production cost. Many companies want to decrease unit cost of wafer. One way of solution is thin silicon solar cell. But thin solar cells are damaged in the physical thermal at tabbing process. The best way is tabbing in lowest soldering temperature and appropriate adhesive. In this paper, a study on heat conduction characteristics by thickness of silicon wafer in same setup with production process. The target is optimization of soldering temperature. The test was known back face temperature at tabbing with hot air and thin wafers conducted more heat flux. It give damage by heat shock. Single crystal wafer and multi crystal wafer by 200㎛,170㎛, 150㎛ thickness was test. In addition, heat transfer process was a visual representation of the simulation by Ansys tool.
온도에 따른 PV모듈의 출력에 영향을 미치는 요소 분석
임종록(Jong-log Lim),우성철(Sung-Cheol Woo),정태희(Tae-Hee Jung),민용기(Yong-Ki Min),원창섭(Chang-Sub Won),안형근(Hyung-Keun Ahn) 대한전기학회 2013 전기학회논문지 Vol.62 No.3
Generally, photovoltaic modules consist of glass, EVA, Solar Cell, back sheet and ribbon. But EVA, solar cell, ribbon affect electric output with temperature. EVA is a change in the transmittance of light from the sun. In addition, the solar cell output is decreased with temperature and the ribbon increases resistance. Transmittance and reflectance of glass and EVA were measured. In this paper, the characteristics of the components of PV module as EVA and Glass, ribbon were studied by variable temperature. effects on material properties investigated. As a result, glass is independent in temperature variation. EVA was the reduction 1~4% in transmittance. Solar cell decrease 0.469[%/℃] in electric output by temperature variation. Other factors was controlled in solar cell..
저수지 내 수상태양광의 전압 강하에 의한 직류 송전 손실
방병관(Byeong Gwan Bhang),우성철(Sung Cheol Woo),이원빈(Wonbin Lee),최진호(Jin Ho Choi),신승욱(SeungWook Shin),이철성(ChulSung Lee),박미란(MiLan Park),원창섭(Changsub Won),안형근(HyungKeun Ahn) 한국신재생에너지학회 2020 신재생에너지 Vol.16 No.1
In Floating PV (Photovoltaic) systems, PV modules are installed on water by utilizing the surface of idle water such as a reservoir and multipurpose dam. A floating PV system, therefore, has the advantage of efficiency in national land use and improved energy yield owing to cooling effect compared to on-land PV systems. Owing to the limitation of installation environment for a floating PV system, the system, however, has the disadvantage of an increase in transmission distance of DC (Direct current) cables. A longer transmission distance of a DC cable results in greater power loss due to a voltage drop. This leads to a decline in economic feasibility for the floating PV system. In this paper, the economic analysis for 10 floating PV systems installed in a reservoir has been conducted in terms of a change in annual power sales according to the variation of transmission losses depending on the factors affecting the voltage drop, such as transmission distance, cross-section area of underwater cable, the presence of joint box, and PV capacity.
단결정 태양전지의 단락 및 개방 시 노광에 의한 초기 출력저하 비교 분석
정태희(Jung Tae-Hee),김태범(Kim Tae-Bum),신준오(Shin Jun-Oh),윤나리(Yoon Na-Ri),우성철(Woo Sung-Cheol),강기환(Kang Gi-Hwan),안형근(Ahn Hyung-Keun),한득영(Han Deuk-Young) 한국태양에너지학회 2010 한국태양에너지학회 논문집 Vol.30 No.6
It is well-known that Boron-doped Cz Si solar cells suffer light-induced degradation due to aboron-oxygen defect which is responsible of a reduction in lifetime and hence efficiency. In this paper, we assume that PV solar cell has been connected with variable load to account the real operating condition and it shows different light-induced degradation of Si solar cell. To evaluate the effect of light-induced degradation for solar cell with various load, Single crystalline solar cells are connected with open and short circuits during light exposure. Isc-Voc curve evaluate light induced degradation of solar cells and the reason is explained as a change for serial resistance. From the results, Electrical characteristics of solar cells show better performance under short circuit conditions, after light exposure.
Tabbing시 결정질 태양전지의 bowing 현상에 관한 분석
정태희(Tae-Hee Jung),김태범(Tae-Bum Kim),신준오(Jun-Oh Shin),윤나리(Na-Ri Yoon),우성철(Sung-Cheol Woo),강기환(Gi-Hwan Kang),안형근(Hyung-Keun Ahn),한득영(Deuk-Young Han) 한국태양에너지학회 2010 한국태양에너지학회 학술대회논문집 Vol.2010 No.11
Recently, most of the photovoltaic module companies have focused on reducing the manufacturing cost. One of the possible ways is the use of thin water solar cell. Thin solar cell, however, provides critical problem such as bowing which causes possible micro cracks inside solar cell, finally, leading to reliability issue. In this paper, bowing has been tested for different thicknesses of ribbon and temperatures of hot plate. Finally, tabbing process to minimize the bowing of the crystalline silicon solar cell has been suggested