Dark I–V curve measurement of single cells in a photovoltaic module

Bernárdez, L.S. De; Buitrago‐Sierra, Robison

doi:10.1002/pip.665

Cited by 16 publications

(4 citation statements)

References 4 publications

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“…Several methods have been proposed to extract individual cell properties from module level data. Some methods involve completely shading a cell to measure the dark‐ IV curve in forward or reverse bias 3. However, achieving 100% shading in a fully packaged module can be difficult due to the transmission of light through the top glass layer from internal reflection.…”

Section: Introductionmentioning

confidence: 99%

Degradation of individual cells in a module measured with differential IV analysis

Alers

Zhou

Deline

et al. 2011

Progress in Photovoltaics

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A methodology is developed for the extraction of cell-level properties from the analysis of differential IV response in a solar module with series connected cells. Through a combination of simulation and experimental verification we show that the shunt resistance and short circuit current of individual cells can be determined from a peak in the module differential resistance with cells that are partially shaded. The magnitude of the peak is equal to the shunt resistance of the cell for small values of shunt resistance. The current at which the peak occurs is proportional to the product of the short circuit current and the shading factor of the particular cell. With this methodology, we are able to measure degradation of 72 individual cells in a single commercial module after a high temperature/high humidity/high voltage stress test. Therefore, the statistics of degradation in this test were improved 72-fold.

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Section: Introductionmentioning

confidence: 99%

Degradation of individual cells in a module measured with differential IV analysis

Alers

Zhou

Deline

et al. 2011

Progress in Photovoltaics

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“…If two panels are in shadow, the string cannot delivery current to the battery. The shadowing of a string does not limit the current delivered by the others [2]. The partial shadowing of a cell has an effect similar to the reduction of irradiance, proportional to shadowed surface.…”

Section: Circuit Solutions and Performancementioning

confidence: 99%

Portable Photo-voltaic Stand-alone System, Operating at Very Low Power Conditions

Vecchio

Timidei

2007

2007 International Conference on Clean Electrical Power

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A new approach to mobile photo-voltaic systems is proposed; the system described in this paper is of very low power (5W) and is intended mainly for recharging or powering small portable electronics devices. The objects of this study are: i) the optimization of photo-voltaic cells connection with regard to mobile conditions; a nonstandard topology is adopted, to compensate shadowing or non-optimal orientation; ii) the introduction of a novel topology for battery and DC/DC converter, in which the battery voltage is optimized for photo-voltaic operation and a buck-boost converter can provide any voltage to the load. A good efficiency is achieved also in marginal condition of illumination (0.1W). A prototype has been built with thin film photo-voltaic cells mounted on a flexible plastic support and integrated in a jacket. A series of measurements havebeen performed in a real-life situation, and the system has been characterized. The efficiency of the proposed system has been compared with a conventional system, in the same operating conditions. Index Terms--photovoltaic portable low power system, low power management, shadowed solar radiation, powering small portable electronics devices.

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“…One approach is to measure illuminated I-V characteristics at single or different levels of illumination [6] for a single cell or PV module. Other techniques utilize non illuminated I-V characteristics [9,10]. The parameters are extracted under standard or constant conditions whereas in the present work the parameters are extracted for outdoor conditions.…”

Section: Introductionmentioning

confidence: 99%

Parameter extraction for flexible photovoltaic (FPV) modules to determine high insolation performance for space solar applications

2009

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Space solar applications will require PV modules with large Wp/kg values with stable output characteristics under extreme insolation conditions. This report is focused on the performance of Flexible PV (FPV) modules with moderate Wp/kg ratings when exposed to sustained insolation conditions reaching a maximum of 910 Watt/m 2 . Three different FPV technologies have been considered, namely mono-crystalline silicon (c-Si), poly-crystalline silicon (pc-Si), and amorphous silicon (a-Si). Based on outdoor observations, the technology impact is most evident from the fill factor (FF) range demonstrated by the PV modules which is high (60 -70%) for crystalline and polycrystalline silicon PV modules and moderate (50 -60%) for amorphous silicon PV modules. A one diode model has been applied to all three PV modules and the theoretically calculated diode non ideality factor (n) has been compared with experimentally observed non idealities in terms of FF. Again the impact of technology is evident from 'n' value calculations which are 1.42 for cSi, 2 for pc-Si and 3.7 for a-Si FPV modules.

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Dark I–V curve measurement of single cells in a photovoltaic module

Cited by 16 publications

References 4 publications

Degradation of individual cells in a module measured with differential IV analysis

Degradation of individual cells in a module measured with differential IV analysis

Portable Photo-voltaic Stand-alone System, Operating at Very Low Power Conditions

Parameter extraction for flexible photovoltaic (FPV) modules to determine high insolation performance for space solar applications

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