Comparison of PV module performance before and after 11 and 20 years of field exposure

Chamberlin, Charles; Rocheleau, M.A.; Marshall, M. W.; Reis, Antonio; Coleman, N.T.; Lehman, Peter

doi:10.1109/pvsc.2011.6185854

Cited by 72 publications

(33 citation statements)

References 5 publications

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“…The fill factor, I-V curve parameter, and bypass diode variations found in the tested arrays have been similarly reported in other literature [1,6,11] and are assumed typical of arrays that have experienced some field degradation in the Southwest US.…”

Section: A I-v Parameter Distributionsupporting

confidence: 77%

Measured module performance variation and the opportunity for distributed power electronics: Analysis of 27 PV arrays in the Southwestern U.S.

MacAlpine

Deline

Erickson

et al. 2013

2013 IEEE 39th Photovoltaic Specialists Conference (PVSC)

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A custom multitracer system has been designed to collect simultaneous, module-level I-V curves over an entire array. This system is used to acquire high and low light module performance data for over 500 modules, deployed in 27 arrays including six different PV technologies in the Southwestern U.S. The modules' current and voltage parameters show relatively little variation in arrays which are five years old or newer, but in older arrays the mean absolute deviation of maximum power between modules may approach 20% or more.Individual module performance models are created from the data and incorporated into hourly energy simulations for each array. Annual mismatch loss (and thus potential for increased energy capture using distributed power electronics) is found to be minimal, less than 1% for most arrays, but in several it is as high as 1-3% when simulated in their installed configurations. Factors contributing to mismatch loss are analyzed, including investigation of the impact of array orientation, size, module ordering, and string wiring configuration. Varying these factors has little impact on some arrays, but on one it creates scenarios in which the annual mismatch losses may exceed 10%.

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Section: A I-v Parameter Distributionsupporting

confidence: 77%

Measured module performance variation and the opportunity for distributed power electronics: Analysis of 27 PV arrays in the Southwestern U.S.

MacAlpine

Deline

Erickson

et al. 2013

2013 IEEE 39th Photovoltaic Specialists Conference (PVSC)

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“…Several cases of PV module degradation caused by single UV exposure have been reported, for example, the delamination at the glass=encapsulant or cell=encapsulant interface, 5,6,9,12) the discoloration of the encapsulant [1][2][3][4]6,[9][10][11]13) and backsheet, [14][15][16] and recently the production of acetic acid in the encapsulant. [17][18][19] However, current standard PV module qualification tests such as IEC 61215 are considered insufficient for the evaluation of UV impact as well as the combined effect of multiple factors on PV modules.…”

Section: Introductionmentioning

confidence: 99%

Effects of UV on power degradation of photovoltaic modules in combined acceleration tests

Williams

Heta

Doi

et al. 2016

Jpn. J. Appl. Phys.

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UV exposure and other factors such as high/low temperature, humidity and mechanical stress have been reported to degrade photovoltaic (PV) module materials. By focusing on the combined effects of UV stress and moisture on PV modules, two new acceleration tests of light irradiation and damp heat (DH) were designed and conducted. The effects of UV exposure were validated through a change in irradiation time (UV dosage) and a change of the light irradiation side (glass side vs backsheet side) in the UV-preconditioned DH and cyclic sequential tests, respectively. The chemical corrosion of finger electrodes in the presence of acetic acid generated from ethylene vinyl acetate used as an encapsulant was considered to be the main origin of degradation. The module performance characterized by electroluminescence images was confirmed to correlate with the measured acetic acid concentration and Ag finger electrode resistance.

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“…As explained in Section 3, crystalline silicon PV cells have been shown to present an annual degradation of the short-circuit current between -0.5%/year and -0.8%/year, whereas V oc and V mp are assumed to remain constant [41][42][43][44][45]. The coefficient of variation (CV) of I sc , which has been reported to increase with time from 1% in year 0 to 10% in year 25, is consequently assumed to increase linearly at 0.36%/year [43].…”

Section: A2 Aging Of Photovoltaic Modules Under a Standard Operationmentioning

confidence: 99%

Impact of distributed power electronics on the lifetime and reliability of PV systems

Olalla

Maksimović

Deline

et al. 2017

Prog. Photovolt: Res. Appl.

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This paper quantifies the impact of distributed power electronics in photovoltaic (PV) systems in terms of end‐of‐life energy‐capture performance and reliability. The analysis is based on simulations of PV installations over system lifetime at various degradation rates. It is shown how module‐level or submodule‐level power converters can mitigate variations in cell degradation over time, effectively increasing the system lifespan by 5–10 years compared with the nominal 25‐year lifetime. An important aspect typically overlooked when characterizing such improvements is the reliability of distributed power electronics, as power converter failures may not only diminish energy yield improvements but also adversely affect the overall system operation. Failure models are developed, and power electronics reliability is taken into account in this work, in order to provide a more comprehensive view of the opportunities and limitations offered by distributed power electronics in PV systems. It is shown how a differential power‐processing approach achieves the best mismatch mitigation performance and the least susceptibility to converter faults. Copyright © 2017 John Wiley & Sons, Ltd.

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Comparison of PV module performance before and after 11 and 20 years of field exposure

Cited by 72 publications

References 5 publications

Measured module performance variation and the opportunity for distributed power electronics: Analysis of 27 PV arrays in the Southwestern U.S.

Measured module performance variation and the opportunity for distributed power electronics: Analysis of 27 PV arrays in the Southwestern U.S.

Effects of UV on power degradation of photovoltaic modules in combined acceleration tests

Impact of distributed power electronics on the lifetime and reliability of PV systems

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