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Research Papers

Prediction of the Potential Induced Degradation of Photovoltaic Modules Based on the Leakage Current Flowing Through Glass Laminated With Ethylene-Vinly Acetate

[+] Author and Article Information
Gi-Hwan Kang

Photovoltaic Laboratory,
Korea Institute of Energy Research (KIER),
152 Gajeong-ro, Yuseong-Gu,
Daejeon 305-343, South Korea
e-mail: ghkang@kier.re.kr

Han-Byul Kim

Dayou Smart Energy Company Limited,
136 Cheomdansaneop 1-ro,
Daesowon-myon, Chungju-si,
Chungbuk-do 380-871, South Korea
e-mail: hbkim@dayou.co.kr

Tae-Hee Jung

Photovoltaic Laboratory,
Korea Institute of Energy Research (KIER),
152 Gajeong-ro, Yuseong-Gu,
Daejeon 305-343, South Korea
e-mail: thjung@kier.re.kr

Young-chul Ju

Photovoltaic Laboratory,
Korea Institute of Energy Research (KIER),
152 Gajeong-ro, Yuseong-Gu,
Daejeon 305-343, South Korea
e-mail: ycju@kier.re.kr

Suk-Whan Ko

Photovoltaic Laboratory,
Korea Institute of Energy Research (KIER),
152 Gajeong-ro, Yuseong-Gu,
Daejeon 305-343, South Korea
e-mail: Korea19@kier.re.kr

Hee-eun Song

Photovoltaic Laboratory,
Korea Institute of Energy Research (KIER),
152 Gajeong-ro, Yuseong-Gu,
Daejeon 305-343, South Korea
e-mail: hsong@kier.re.kr

Contributed by the Solar Energy Division of ASME for publication in the JOURNAL OF SOLAR ENERGY ENGINEERING: INCLUDING WIND ENERGY AND BUILDING ENERGY CONSERVATION. Manuscript received August 19, 2014; final manuscript received February 10, 2015; published online March 17, 2015. Editor: Robert F. Boehm.

J. Sol. Energy Eng 137(4), 041001 (Aug 01, 2015) (6 pages) Paper No: SOL-14-1240; doi: 10.1115/1.4029933 History: Received August 19, 2014; Revised February 10, 2015; Online March 17, 2015

In the potential induced degradation (PID) phenomenon, the output power of a photovoltaic (PV) module decreases due to the high potential difference between the PV system and the ground. This voltage forcefully moves the positive charge in the module to the surface of the solar cell. The accumulated charge leads to the performance deterioration of the module, namely, PID of the module. We conducted a study to accurately predict the output reduction of the module operating in various installation conditions coming from the PID phenomenon. We investigated the leakage current flowing through front glass laminated with encapsulation material simultaneously exposed to various performance conditions of the PV system, namely, relative humidity, temperature, and applied voltage, which have an important effect on the PID of the module. The degradation of the module coming from PID was calculated on the basis of the obtained leakage current. To confirm the calculated data, modules with one solar cell were manufactured and the power loss results of the modules' exposure to various PID generation experiments were compared with the expected results. The results showed that we could predict the degradation of the modules by PID within a 2% tolerance under the PV system installation conditions.

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Copyright © 2015 by ASME
Topics: Temperature , Glass , Leakage
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References

Figures

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Fig. 1

The diagram of the experimental procedure

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Fig. 3

The resistance of EVA/Glass in three experimental conditions: (a) 250 V, (b) 500 V, and (c) 1000 V

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Fig. 4

The leakage current passing through Glass/EVA in the various experimental conditions: (a) 250 V, (b) 500 V, and (c) 1000 V

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Fig. 5

Illuminated current–voltage curves of mini modules after the PID generation experiment (85 °C, 85% RH, 1000 V)

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Fig. 6

The dark I–V curves of the mini modules after the PID generation experiment (85 °C, 85% RH, 1000 V)

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Fig. 7

EL images of the mini modules before and after the PID generation experiment (85 °C, 85% RH, 1000 V)

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Fig. 8

The average power loss ratio of the mini modules for each experimental condition in Table 4

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Fig. 9

The measured and predicted power loss ratio of modules coming from PID for equal time

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Fig. 2

The schematic diagram of the leakage current measurement method of glass laminated with an EVA sheet

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