• Title/Summary/Keyword: PV Cell

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Photovoltaic System Output Forecasting by Solar Cell Conversion Efficiency Revision Factors (태양전지 변환효율 보정계수 도입에 의한 태양발전시스템 발전량 예측)

  • Lee Il-Ryong;Bae In-Su;Shim Hun;Kim Jin-O
    • The Transactions of the Korean Institute of Electrical Engineers B
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    • v.54 no.4
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    • pp.188-194
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    • 2005
  • There are many factors that affect on the system output of Photovoltaic(PV) power generation; the variation of solar radiation, temperature, energy conversion efficiency of solar cell etc. This paper suggests a methodology for calculation of PV generation output using the probability distribution function of irradiance, PV array efficiency and revision factors of solar cell conversion efficiency. Long-term irradiance data recorded every hour of the day for 11 years were used. For goodness-fit test, several distribution (unctions are tested by Kolmogorov-Smirnov(K-S) method. The calculated generation output with or without revision factors of conversion efficiency is compared with that of CMS (Centered Monitoring System), which can monitor PV generation output of each PV generation site.

A Study on Validity of Anti-PID Technology of Solar Cell for the High Reliability of Photovoltaics System (태양광 발전시스템의 신뢰성 향상을 위한 태양전지의 PID 저감 기술의 타당성 검토)

  • Baik, Sungsun;Baek, Seungyup;Jung, Tae-Wook;Cho, Jin-Hyng
    • Journal of Korean Society of Industrial and Systems Engineering
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    • v.36 no.2
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    • pp.32-38
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    • 2013
  • In recent years, anti-PID (Potential Induced Degradation) technologies have been studied and developed at various stages throughout the solar value chain from solar cells to systems in an effort to enhance long-term reliability of the photovoltaics (PV) system. Such technologies and applications must bring in profits economically for both manufacturers of solar cell/module and investors of PV systems, simultaneously for the development of the PV industry. In this study two selected anti-PID technologies, ES (modification of emitter structure) and ARC (modification of anti-reflective coating) were compared based on the economic features of both a cell maker with 60MW production capacity and an investor of 1MW PV power plant. As a result of this study, it is shown that ARC anti-PID technology can ensure more profits over ES technology for both the cell manufacturer and the investor of PV power plant.

The observation of solar cell's micro-crack depending on EVA Sheet's lamination condition for photovoltaic module (PV 모듈용 EVA Sheet의 Lamination 공정 조건에 따른 태양전지 크랙발생 현상 관찰)

  • Kang, Kyung-Chan;Kang, Gi-Hwan;Huh, Chang-Su;Yu, Gwon-Jong
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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    • 2008.06a
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    • pp.9-9
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    • 2008
  • Recently, the thickness of solar cell gets thinner to reduce the quantity of silicon. And the reduced thickness make it easy to be broken while PV module fabrication process. This phenomenon might make PV module's maximum power and durability down. So, when using thin solar cell for PV module fabrication, it is needed to optimize the material and fabrication condition which is quite different from normal thick solar cell process. Normally, gel-content of EVA sheet should be higher than 80% so PV module has long term durability. But high gel-content characteristic might cause micro-crack on solar cell. In this experiment, we fabricated several specimen by varying curing temperature and time condition. And from the gel-content measurement, we figure the best fabrication condition. Also we examine the crack generation phenomenon during experiment.

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The Study on Thermal Shock Test Characteristics of Solar Cell for Long-term Reliability Test (장기 신뢰성 평가를 위한 태양전지의 열충격 시험 특성에 관한 연구)

  • Kang, Min-Soo;Kim, Do-Seok;Jeon, Yu-Jae;Shin, Young-Eui
    • Journal of Energy Engineering
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    • v.21 no.1
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    • pp.26-32
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    • 2012
  • This study has been performed Thermal Shock test for analyze the cause of Power drop in PV(Photovoltaic) Module. Thermal Shock test condition was performed with temperature range from $-40^{\circ}C{\sim}85^{\circ}C$. One cycle time is 30min. which are consist of low and high temperature 15min. each other. The test was performed with total 500cycles. EL, I-V were conducted every 100cycle up to 500cycles. Mono Cell resulted in 8% Power drop rates in Bare Cell and 9% in Solar Cell. In the case of Multi Cell resulted in 6% Power drop rates in Bare Cell and 13% in Solar Cell. After Thermal Shock test, Solar Cell's Power drop resulted from surface damages, but in the case of Bare Cell's Power drop had no surface damages. Therefore, Bare Cell's Power drop was confirmed as according to leakage current increase by analysis of Fill Factor after Thermal Shock test. Also, Solar Cell's Power drop rates are higher than that of Bare Cell because of surface damages and consuming electric power increase. From now on, it should be considered that analyzed the reasons of Fill Factor decrease and irregular Power drop in PV module and Cell level using cross section, various conditions and test methods.

Prediction of Output Power for PV Module with Tilted Angle and Structural Design (태양광 모듈의 구조디자인과 설치각도에 따른 출력예측)

  • Ko, Jae-Woo;Yun, Na-Ri;Min, Yong-Ki;Jung, Tae-Hee;Won, Chang-Sub;Ahn, Hyung-Keun
    • The Transactions of The Korean Institute of Electrical Engineers
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    • v.62 no.3
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    • pp.371-375
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    • 2013
  • A new model about output power prediction of PV module with various tilted angles and cell to cell distances has been proposed in this paper. Light intensity arrived on a solar cell could be changed by characteristics of PV module materials. Refractive indices, thickness and absorption coefficients of glass, EVA, solar cell and Backsheet are used to predict output. Also, the incident angle of light is changed 0 to 90[$^{\circ}$] and cell to cell distances are 5, 10 15[mm]. Two types of light incident on a solar cell are considered which are direct to a solar cell and reflected from Backsheet. The intensity of the incident light directly into the solar cell is reduced through glass and EVA about 17.5[%] in theoretical way. It has an error of 2.26[%] compared with experimental result. The results for compare theoretical with experimental data is validated within the error of 6.3[%]. This paper would be a research material to predict output power when the PV module is installed outdoor or a building.

Electrical Characteristics of Mono Crystalline Silicon Solar Cell for Concentrating PV System using Fresnel Lenses (프레넬 렌즈를 이용한 집광 시 단결정 실리콘 태양전지의 전기적 특성)

  • Kang, Kyung-Chan;Kang, Gi-Hwan;Yu, Gwon-Jong;Huh, Chang-Su
    • Proceedings of the KIEE Conference
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    • 2007.07a
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    • pp.218-219
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    • 2007
  • Silicon feed stock shortage have acted as major restraints for growth of photovoltaic industry. Concentrating photovoltaic (CPV) system will reduce the use of silicon PV materials. This paper presents the application possibility of mono-crystalline silicon solar cell, which has increased in market share, for PV concentrator. We measured the power of solar cell using sun simulator and I-V curve tracer and compared the results. The comparison of results showed that the concentrated solar cell generated the power more approximately 7 times than without concentration in spite of non-heat sink. If CPV technology included heat sink combines already developed PV tracking system, it will have a merit economically.

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The comparison of maximum output power of PV module by solar cell breakage (PV 모듈에서 셀의 파손에 따른 전기적 출력 특성 비교)

  • Lee, Jin-Seob;Kang, Gi-Hwan;Park, Chi-Hong;Yu, Gwon-Jong;Ahn, Hyung-Gun;Han, Deuk-Young
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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    • 2007.06a
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    • pp.9-10
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    • 2007
  • In this paper, we investigated the effect of solar cell breakage on maximum output power of PV module. The test result using artificial light source didn't give any change in output power in case of crack near electrical ribbon. Also, there was a reduction in output power in case of increasing of crack area far from electrical ribbon. But, this experiment is under artificial light source test method. So, when such a PV module is outdoor for a long time, there would be problems on electrical output power and durability because of thermal aging phenomenon of solar cell breakage.

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Rapid and Accurate Measurement of Diffusion Length of Minority Carriers of CIGS Solar Cells (CIGS 태양전지의 소수캐리어 확산 거리에 대한 새로운 측정 방안 연구)

  • Lee, Don Hwan;Kim, Young Su;Mo, Chan Bin;Nam, Jung Gyu;Lee, Dong Ho;Park, Sung Chan;Kim, Byoung June;Kim, Dong Seop
    • Current Photovoltaic Research
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    • v.2 no.2
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    • pp.59-62
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    • 2014
  • Minority carrier diffusion length is one of the most important parameters of solar cells, especially for short circuit current density (Jsc). In this report, we proposed the calculating method of the minority carrier diffusion length ($L_n$) in CIGS solar cells through biased quantum efficiency (QE). To verify this method's reliability, we chose two CIGS samples which have different grain size and calculated $L_n$ for each sample. First of all, we calculated out that $L_n$ was 56nm and 97nm for small and large grain sized-cell through this method, respectively. Second, we found out the large grain sized-cell has about 7 times lower defect density than the small grain sized-cell using drive level capacitance profiling (DLCP) method. Consequently, we confirmed that $L_n$ was mainly affected by the micro-structure and defect density of CIGS layer, and could explain the cause of Jsc difference between two samples having same band gap.

A Battery Charger Using Photovoltaic Energy Harvesting with MPPT Control (빛 에너지 하베스팅을 이용한 MPPT 제어 기능을 갖는 배터리 충전기)

  • Yoon, Eun-Jung;Yang, Min-Jae;Yu, Chong-Gun
    • Journal of IKEEE
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    • v.19 no.2
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    • pp.201-209
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    • 2015
  • This paper describes a battery charger using photovoltaic energy harvesting with MPPT control. The proposed circuit harvests maximum power from a PV(photovoltaic) cell by employing MPPT(Maximum Power Point Tracking) control and charges an external battery with the harvested energy. The charging state of the battery is controlled according to the signals from a battery management circuit. The MPPT control is implemented using linear relationship between the open-circuit voltage of a PV cell and its MPP voltage such that a pilot PV cell can track the MPP of a main PV cell in real time. The proposed circuit is designed in a $0.35{\mu}m$ CMOS process technology and its functionality has been verified through extensive simulations. The maximum efficiency of the designed entire system is 86.2% and the chip area including pads is $1.35mm{\times}1.2mm$.

Decomposition of EVA(Ethylene vinyl acetate) used as an adhesion of photovoltaic(PV) module by ultrasonic irradiation in bath-type cleaner (Bath-type 초음파(超音波) 세척기(洗滌器)를 이용(利用)한 태양전지모듈 접착제(接着劑) EVA(Ethylene Vinyl Acetate) 분해특성(分解特性))

  • Kim, Young-Jin;Lee, Jae-Ryeong
    • Resources Recycling
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    • v.20 no.6
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    • pp.50-55
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    • 2011
  • Using ultrasonic irradiation, the separation and recovery of PV cell, made of silicon wafer, from PV module was carried out through selective decomposition of EVA used as an interlaminated binder. The ultrasonic cleaner of bath-type (Output: 130 W, Frequency: 40 kHz) was used as an ultrasonic apparatus in this research. With the fixed distance of 2 cm, from ultrasonic generator to PV cell, the experiment of EVA decomposition was performed in various organic solvents such as Toluene, Trichloroethylene, O-dichlorobenzene, Benzene. And also their concentrations and temperature was changed to survey the optimum conditions. However EVA can be decomposed perfectly at $55^{\circ}C$ within 160 min in 5 M of all kinds of solvent, PV cell may be recovered with being damaged or broken severely. This damage may be resulted from the swelling of EVA in the process of decomposition. Whereas, at the condition of 5 M at $65^{\circ}C$, PV cell can be recovered with the state of minor damage or crack. This implies that the decomposition rate of EVA increases with an increase of temperature, thereby EVA can be decomposed before the swelling of EVA layer. Conclusively, it is possible for PV cell to be recovered within 40 min, at $65^{\circ}C$ in 5 M, with less damage.