Influence of potential induced degradation phenomena on electrical insulating backsheet in photovoltaic modules

Zhang, Jiawei; Cao, De-kun; Cui, Yan-chen; Wang, Fei; Putson, Chatchai; Song, Chen

doi:10.1016/j.jclepro.2018.10.057

Cited by 21 publications

(10 citation statements)

References 22 publications

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“…Compared with the traditional polymeric backsheet, such as the single-layered PET backsheet, the discharge magnitude of compound backsheet is relatively lower . Because the interface between the PVDF or PVF layer and PET layer will generate a certain number of barriers for the discharge channels, the multilayer film exhibits a higher electric breakdown strength than that of the monolayer film, which is in accordance with the results carried out by Yao et al…”

Section: Resultssupporting

confidence: 88%

“…Compared with the traditional polymeric backsheet, such as the single-layered PET backsheet, the discharge magnitude of compound backsheet is relatively lower. 17 Because the interface between the PVDF or PVF layer and PET layer will generate a certain number of barriers for the discharge channels, the multilayer film exhibits a higher electric breakdown strength than that of the monolayer film, which is in accordance with the results carried out by Yao et al 18 Figure 5a−h shows the topographical range of AFM images obtained from KPK and TPT backsheets. Although the height is not the same, the shape of rolling hills shown on the topography of the insulting backsheets could be the fibril structure of the insulating polymer fiber.…”

Section: Experiments Setupsupporting

confidence: 85%

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Investigation on the Effect of Accumulated Charge-Induced Degradation on Multilayer Photovoltaic Insulating Backsheets Based on Atomic Force Microscopy

Zhang

Cao

Yin

et al. 2020

ACS Appl. Energy Mater.

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As a clean and renewable energy, solar energy has drawn people’s attention to mitigate the energy crisis around the world. A solar photovoltaic (PV) system is a reliable way to collect solar energy whose service lifetime is usually shorter than the designed time because of accumulated charge-induced degradation caused by electrical aging. With the rapid development of PV systems, the traditional polyethylene terephthalate (PET) backsheet cannot meet the requirements of insulation and package for the advanced solar energy system. In this context, two different backsheet materials, namely, KPK (polyvinylidene fluoride, PET, polyvinylidene fluoride) and TPT (polyvinyl fluoride, PET, polyvinyl fluoride), were selected to explore accumulated charge-induced degradation caused by partial discharge (PD) and corona discharge. In this paper, the backsheets were electrically stressed for 30, 60, and 120 min by PD and electrically stressed for 10 min by corona discharge. The accumulation and transportation of charges were investigated by phase-resolved partial discharge (PRPD) and surface potential decay (SPD). At the same time, the topography of KPK and TPT determined using atomic force microscopy after PD activity was also investigated. The explorations of PD activity showed that KPK and TPT have a similar PD resistance, but their SPD were entirely different after corona discharge. The research works in this paper provide an important path to investigate the aging process of insulating polymers and evaluate the lifetime of insulating backsheets of PV modules, as well as a guidance to improve the testing standards for the PV system.

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Section: Resultssupporting

confidence: 88%

Section: Experiments Setupsupporting

confidence: 85%

Investigation on the Effect of Accumulated Charge-Induced Degradation on Multilayer Photovoltaic Insulating Backsheets Based on Atomic Force Microscopy

Zhang

Cao

Yin

et al. 2020

ACS Appl. Energy Mater.

Self Cite

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“…The specimens were stored in a vacuum oven at 80°C for >24 h before the measurement [17][18][19]. Before SPD measurement, EPR specimens were placed between a grounded stainless-steel sheet to neutralise the surface charge of both surfaces.…”

Section: Measurements Of Electrical Propertiesmentioning

confidence: 99%

Effect of long‐term fluorination on surface electrical performance of ethylene propylene rubber

et al. 2019

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To investigate the effect of fluorination on surface electrical performance of ethylene propylene rubber (EPR), four pieces of EPR specimens are prepared and fluorinated for different duration ranging from 120 min to 480 min. The surface morphology and element compositions of experimental specimens are tested. The surface potential decay and complex permittivity are measured. The tracking discharge property and the erosion properties after tracking test are investigated. The surface charge transport and electrical property tailoring mechanism are discussed. The results show that when the fluorination duration is from 120 min to 360 min, the surface morphology gradually becomes flat and compact with time, and the surface resistance to electrical tracking is improved. While an excessive fluorination with the duration of 480 min leads to a significant increase in surface conductivity and a weakening in the resistance to electrical tracking, which is mainly due to a change in surface morphology. The recommended fluorination duration for an optimised surface property is between 240 and 360 min for EPR specimen.

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“…To mimic backsheet outdoor performance, various accelerated aging methods have been used. [7][8][9][10][11] Single stress tests are generally performed under various combinations of exposure to damp heat (DH), ultraviolet (UV), and thermal cycling (TC). Sequential tests 12,13 are recommended by some 3rd parties, such as researchers at the National Renewable Energy Laboratory (NREL) [14][15][16] and Photovoltaic Evolution Labs (PVEL), 17,18 which can better simulate field conditions and observed failure modes.…”

Section: Introductionmentioning

confidence: 99%

“…An important step forward has been the implementation of accelerated aging tests specified in these standards. To mimic backsheet outdoor performance, various accelerated aging methods have been used 7–11 . Single stress tests are generally performed under various combinations of exposure to damp heat (DH), ultraviolet (UV), and thermal cycling (TC).…”

Section: Introductionmentioning

confidence: 99%

Impact of specimen preparation method on photovoltaic backsheet degradation during accelerated aging test

Xia

Liu²,

et al. 2022

Energy Science & Engineering

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In this study, we highlight some important factors in the specimen preparation methods for evaluating photovoltaic backsheet properties after accelerated aging. Two different sequences are considered: Method (I) cut-then-age: cut into 1-cm wide strips and then expose to stress, and Method (II) age-then-cut: expose a larger sheet to stress and then cut into 1-cm widths for mechanical property measurements. We also compare the effect of three cutting methods, (a) tensile specimen punch, (b) paper cutter, and (c) fresh razor blade. Several commercial backsheets were evaluated, with stress exposures including (a) pressure cooker test (PCT), (b) dry ultraviolet (UV) radiation exposure, and (c) UV combined damp heat tests. Fourier transform infrared spectrometer (FTIR) and intrinsic viscosity (IV) were used to analyze the materials on unstressed materials and samples exposed to PCT. The results show that both the cutting method and the time of cutting have an impact on the backsheet mechanical properties. Under UV exposure, Method II, age-then-cut, generally resulted in a higher average value, with more variation than Method I; however, if the side strips from Method II were excluded, the variation dropped to the same level. This is because the specimens at the sides of the sheet get additional damage from UV light from the exposed sides of the sample. In contrast to UV exposure, PCT specimens prepared by Method II result in lower average values and higher variability. This is attributed to embrittlement through the bulk of the sample where the cutting of embrittled specimens appears to result in more edge defects which can then initiate a break at smaller strains. The data suggest that for UV exposures, the specimens should be cut after aging and the exposed side specimens discarded, and that for PCT exposures, the specimens should be cut before the exposure.

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Influence of potential induced degradation phenomena on electrical insulating backsheet in photovoltaic modules

Cited by 21 publications

References 22 publications

Investigation on the Effect of Accumulated Charge-Induced Degradation on Multilayer Photovoltaic Insulating Backsheets Based on Atomic Force Microscopy

Investigation on the Effect of Accumulated Charge-Induced Degradation on Multilayer Photovoltaic Insulating Backsheets Based on Atomic Force Microscopy

Effect of long‐term fluorination on surface electrical performance of ethylene propylene rubber

Impact of specimen preparation method on photovoltaic backsheet degradation during accelerated aging test

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