• 제목/요약/키워드: PV Cell

검색결과 502건 처리시간 0.028초

PV moudule의 출력손실 저감요인 분석 (A Study for reduction of the power loss of PV modules)

  • 이상훈;강기환;유권종;안형근;한득영
    • 한국태양에너지학회:학술대회논문집
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    • 한국태양에너지학회 2011년도 추계학술발표대회 논문집
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    • pp.45-50
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    • 2011
  • The efficiency of solar cell was about 4[%] in initial stage of photovoltaic industry, but it has quite a lot of efficiency through technology advances. Today, the efficiency of c-Si solar cells is about 17 to 19[%] and the efficiency of PV modules is about 14 to 15 [%]. We called that electrical losses occurred in the Conversion of solar cells to PV modules are CTM loss(Cell To Module loss), the CTM loss typically has a value of about3~5[%]. The more efficiency of solar cell increase, differences are larger because the efficiency decrease owing to physical or technical problems occurred in the Conversion of solar cells to PV modules. In this study, the power loss factors occurred in the Conversion of solar cells to PV modules are analyzed and it is proposed that how to reduce losses of the PV module. The types of power loss factor are (1)losses of front glass and encapsulant(generally EVA sheet), (2)losses by sorting miss, (3)losses by interconnection, (4)losses by the field aging of PV modules. In further study, experimental and evaluation will be conducted to make demonstrate for proposed solutions.

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주변온도, 풍속, 일사량에 의한 PV Cell의 전기적 특성 분석 (Electrical Characteristics of PV Cells by Ambient Temperature, Wind Speed and Irradiance Level)

  • 박현아;김효성
    • 전력전자학회:학술대회논문집
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    • 전력전자학회 2015년도 전력전자학술대회 논문집
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    • pp.277-278
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    • 2015
  • 태양광발전소를 설치하기 위한 경제적 타당성을 분석하는 경우 기상청에서 제공하는 해당지역의 날씨정보를 기반으로 하는 PV Cell의 연간 발전량 예측 및 분석이 중요한 변수가 된다. 또한 날씨 조건에 대한 PV 발전의 예측은 기 설치되어 운전중에 있는 태양광발전소의 고장진단 및 성능평가에도 사용될 수 있다. 본 논문은 다양한 날씨 조건 중 주변온도, 풍속, 일사량에 따른 PV Cell의 특성을 분석하고, 실시간으로 변화하는 날씨환경에 대하여 순시적으로 PV Cell의 출력특성을 정확히 예측할 수 있는 모델을 수립한다.

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PV.1 induced by FGF-Xbra functions as a repressor of neurogenesis in Xenopus embryos

  • Yoon, Jaeho;Kim, Jung-Ho;Lee, Sung-Young;Kim, SungChan;Park, Jae-Bong;Lee, Jae-Yong;Kim, Jaebong
    • BMB Reports
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    • 제47권12호
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    • pp.673-678
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    • 2014
  • During Xenopus early development, FGF signaling is involved in mesoderm formation and neurogenesis by modulating various signaling cascades. FGF-MAPK signaling induces Xbra expression, which maintains mesodermal fate through an autocatalytic-loop. Interestingly, previous reports have demonstrated that basic FGF (bFGF) treatment alone does not induce neurogenesis in ectodermal explants, even though FGF signaling inhibits BMP signaling via phosphorylation in Smad1 linker region. In addition, the overexpression of dominantnegative Xbra induces neurogenesis in ectodermal explants. However, the detailed mechanism underlying these phenomena has not yet been clarified. In this work, we showed that bFGF-Xbra signaling increased the PV.1 expression. DN-Xbra was found to decrease PV.1 expression, and the co-injection of PV.1 with DN-Xbra reduced neurogenesis in ectodermal explants. Furthermore, the knockdown of PV.1 induced neurogenesis in bFGF-treated ectodermal explants. Taken together, our results demonstrate that FGF-Xbra signaling induces PV.1 expression and that PV.1 functions as a neural repressor in the FGF-treated ectoderm.

기계적 하중에 따른 스트레스로 인한 PV 모듈의 전기적 특성 (The Electrical Characteristics of PV Module by the Stress in accordance with Mechanical Weight Load)

  • 공지현;지양근;강기환;유권종;안형근;한득영
    • 한국태양에너지학회:학술대회논문집
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    • 한국태양에너지학회 2009년도 추계학술발표대회 논문집
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    • pp.104-109
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    • 2009
  • If the Photovoltaic(PV) Module should get physical load, the PV module will be warped according to elongation of the front glass and then micro-crack will be occurred in the heat sealed Solar Cell. This micro-crack drops output of the short circuit current and the open circuit voltage of the PV Module. This is because of increase of resistance component by micro-crack. Micro-crack at specific Solar Cell in the module reduces the durability of PV Module such as less output, Hot-Spot in the PV module caused by Solar Cell output mismatch, heat generating as resistance component caused by micro-crack. In this study, among some factors which effect to the output of crystalline PV Module, we will see how the micro-crack caused by mechanical stress effects to the electrical output of PV Module.

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태양전지의 단락전류 편차가 태양전지모듈에 미치는 전기적인 영향 분석 (The electrical effects of PV cell's short-circuit current difference for PV module application)

  • 김승태;박지홍;강기환;안형근;한득영;유권종
    • 한국전기전자재료학회:학술대회논문집
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    • 한국전기전자재료학회 2008년도 하계학술대회 논문집 Vol.9
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    • pp.3-4
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    • 2008
  • Photovoltaic module consists of serially connected solar cell which has low voltage characteristics. But, the other way, the whole current flow of PV module is restricted by lowest current of one solar cell. For the experiment, we make PV module composing the solar cells that have short circuit current difference of 0%, 1%, 3% and 5%. Using Light I-V and Dark I-V measurements, electrical characteristic parameters like Isc(short-circuit current), Voc(open-circuit voltage), Rs(series resistance), Rsh(shunt resistance) are analyzed. PV module of low current characteristics has electrical stress from other modules. And, such a module has a tendency of hot-spot suffering which leads degradation.

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태양전지 온도 센싱만을 통한 태양광 발전시스템의 최적 운전전압에 관한 연구 (A Study on the Optimal Voltage for MPPT Obtained by only Surface's Temperature of Solar Cell)

  • Minwon Park;In-Keun Yi
    • 대한전기학회논문지:전기기기및에너지변환시스템부문B
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    • 제53권4호
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    • pp.269-275
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    • 2004
  • Photovoltaic(PV) system has been studied and watched with keen interest due to a clean and renewable power source. But, the output power of PV system is not only unstable but uncontrollable, because the maximum power point tracking (MPPT) of PV system is still hard with the tracking failure under the sudden fluctuation of irradiance. Authors suggest that the optimal voltage for MPPT be obtained by only solar cell temperature. Having an eye on that the optimal voltage point of solar cell is in proportion to its panel temperature, with operating the power converter whose operating point keeps its input voltage to the optimal voltage imagined by the surface's temperature of PV panel, the maximum power point becomes tenderly possible to be tracked. In order to confirm the availability of the proposed control scheme. And both control methods are simulated not only on the various angle of sampling time of switching control, but also with the real field weather condition. As the results of that, the conversion efficiency between PV panel and converter of the proposed control scheme was much better than that of the power comparison MPPT control, and what is better, the output voltage of PV panel was extremely in stable when the optimal voltage for MPPT is obtained by only solar cell temperature.

태양전지 신뢰성 정보은행 (Solar Cell Reliability Data Bank)

  • 소원섭;오수영
    • Current Photovoltaic Research
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    • 제2권3호
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    • pp.140-145
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    • 2014
  • The globally used PV qualification tests and reports the pass/fail only. Therefore, the reliability of new PV materials and parts can't be compared quantitatively with the reliability of the PV parts and materials in the market. Global PV materials and parts companies test and compare their materials, parts, and modules using the failure-to-test (FTT). However, it takes a long accelerated stress test (AST) until failure. It also needs to test the new and existing materials and parts. Therefore, it requires excessive equipment time and cost. In order to reduce the time and cost, a new reliability enhancement methodology has been developed. It tests the PV materials, parts, and modules in the global market and stores them in the PV reliability database. It reduces the time and cost of the comparison and enhancement of PV reliability. An example of the reliability enhancement of the PV encapsulant, EVA is presented.

정원등(lanterns)용 태양전지셀의 온도특성 변화연구 (A study on characteristic variation of solar cells for lanterns as a temperature change)

  • 이세현;조미령;신상욱;황명근;양승용
    • 한국신재생에너지학회:학술대회논문집
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    • 한국신재생에너지학회 2006년도 춘계학술대회
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    • pp.206-209
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    • 2006
  • In this paper, I try to measure the electrical characteristics of PV cell for lanterns with solar simulator and simulated with PC1D software. I keep my eye on the characteristics variation of PV cell as a temperature change. Therefore, I try to increase a temperature of controlled block from $10^{\circ}C$ to $50^[\circ}C$ while measuring the FV cell. As a result, A variation caused by voltage have an effect on the efficacy of PV cell. Hence it is an important variable when a designer plan to make a solar cell for lanterns.

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스팬드럴용 투광형 결정계 PV창호의 셀 간격 개구율에 따른 온도 및 발전성능 해석연구 (Temperature and Power Generation Characteristics of c-Si G/G Spandrel Window depending on Opening Ratio of PV Module)

  • 윤종호;김동수;오명환;이재범
    • 한국태양에너지학회 논문집
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    • 제32권4호
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    • pp.51-58
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    • 2012
  • This study aims to analyze characteristics of Cell surface temperature and generated power performance for improving PV(Photovoltaic) system condition according to the cell opening ratio of transparent crystal PV system at Spandrel of curtain-wall. For this purpose, alternatives were classified for eight different cases that opening ratio of transparent crystal PV system varied from 0% to 70%, which was used by simulation tool, EnergyPlus. As results, it turned out that increasing opening ratio of transparent crystal PV system led higher PV surface temperature, back-sheet type was thus the most advantageous for decreasing surface temperature, annual generating efficiency, and annual accumulated generating power. Consequently, blocking off air space from outside insolation can advantageously keep to be better condition for generated power performance.