Types of PV Modules under the Lens

Chianese, D.; Cereghetti, Nerio; Rezzonico, S.; Travaglini, G.

doi:10.4324/9781315074405-92

Cited by 6 publications

(4 citation statements)

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“…In Ref. [5], a shorter 1.5-year experiment was reported that showed rates of -3.7% to -5.0% per year in six identical modules, again with negligible changes to FF and V oc . Assuming initial rapid I sc drops of -2.5%, these rates correspond to about -0.8% to -1.7% per year of slow degradation.…”

Section: Previous Resultsmentioning

confidence: 99%

Degradation analysis of weathered crystalline-silicon PV modules

Osterwald

Anderberg

Rummel

et al.

Conference Record of the Twenty-Ninth IEEE Photovoltaic Specialists Conference, 2002.

111

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Section: Previous Resultsmentioning

confidence: 99%

Degradation analysis of weathered crystalline-silicon PV modules

Osterwald

Anderberg

Rummel

et al.

Conference Record of the Twenty-Ninth IEEE Photovoltaic Specialists Conference, 2002.

111

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“…Consequently, MLR can be used to close the gaps in data, which provides a broader overlook of device performance. The IEC methodology provides a combination of interpolation or extrapolation procedures depending on the targeted external conditions, 17,23) which can be avoided using the MLR as it only requires one fitting procedure per data frame.…”

Section: Methodsmentioning

confidence: 99%

Periodical evaluation of photovoltaic modules and diode parameter extraction method using multiple linear regression models

Basulto

Ulbrich

Schlatmann

2023

Jpn. J. Appl. Phys.

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The stability and performance of photovoltaic modules can be assessed by outdoor testing where external conditions such as illumination and module temperature are measured at regular time intervals together with the jV-curve of the module. However, the fluctuation and seasonal variation of external conditions can make it difficult to trace changes such as degradation in PV-module properties (at e.g. STC). This contribution demonstrates the use of multiple linear regressions (MLR) to overcome these difficulties. The data gathered over large periods are condensed into a set of few predictors, which reproduce the jV parameters at infrequently encountered conditions that are required for comparison. Furthermore, the parameters of a physical device model are calculated directly from MLR-predictors, validating our procedure two-fold, by applying the MLR-method to simulated data, replicating the original input parameters, and by comparing monthly parameter averages between the MLR-method and a known parameter extraction method.

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“…Esto conlleva que, en la práctica, los módulos suministrados estén más o menos alejados del valor nominal. Los propios fabricantes especifican un margen de potencia admisible de ±5% o ±10%, normalmente, en módulos de silicio cristalino, si bien, se encuentran habitualmente en su margen negativo, con ejemplos de módulos incluso con una potencia inicial inferior al mínimo especificado 89,90 .…”

Section: Potencia Inicialunclassified

“…Se produce en general una degradación mayor en los primeros meses de operación, siendo esta situación más acusada en la tecnología de silicio amorfo, con valores de pérdida de potencia referenciados entre el 10-30%, según modelos 92,93,94 , debido básicamente a la incidencia de la radiación solar por el denominado efecto de Staebler-Wronski 95 . En módulos de silicio cristalino también se produce una cierta degradación inicial, aunque inferior, con referencias de pérdida de potencia en los primeros 6 meses del 1% 93 o del 5% en el primer año 90 . Una vez estabilizados los módulos, la tasa de degradación durante el resto de su vida útil es inferior a la experimentada durante el período inicial, con valores alrededor del 1-2% anual en silicio amorfo 74,92 y, en general, algo inferior (0,5%-1%) para silicio cristalino 82,83,84,85 .…”

Section: Pérdida De Potencia Por Degradaciónunclassified

Confiabilidad de los sistemas fotovoltaicos autónomos: Aplicación a la electrificación rural

Villar¹

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Stand-alone photovoltaic (PV) systems represent a very useful technology for off-grid electrification, taking advantage of the energy source free disposal and the installation autonomy. The progressive growth in number of systems installed and their distribution worldwide should not hide, however, the existence of difficulties in their implementation and long-term operation. Together with social, economical and even political problems, insufficient technical quality in systems and the low attention paid to maintenance is recognised. With the exception of the PV modules, the reliability of the components of a PV installation and their common integration is not satisfactory. Actually, problems are caused more by the own systems decentralized location and the lack of a deep knowledge of their real operating conditions than by big technical complexities. In this sense, it should be remarked that PV technology has developed, in general, without an optimum benefit from the accumulated experience, and more due to individual initiatives of the various agents implied, with independent projects composed by a low number of systems. Meanwhile, PV engineering does not have, at the moment, the tools for stand-alone PV system operation analysis, from a long-term dependability point of view.Within this context, the Doctoral Thesis presented here, tries to contribute to stand-alone PV system technical quality improvement. Work can be divided in two main and related subjects. From one side, tools for electrical generating systems dependability analysis and modelling are proposed, remarking the main particular characteristics of PV technology. Its practical application to several scenes, which are representative of rural electrification, show the importance of a common handling of failure related reliability, non-operating time for repairing and sizing related reliability. This one includes real components and the effects of the randomness of solar radiation and the uncertainty of energy consumption. Together with this

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Types of PV Modules under the Lens

Cited by 6 publications

References 0 publications

Degradation analysis of weathered crystalline-silicon PV modules

Degradation analysis of weathered crystalline-silicon PV modules

Periodical evaluation of photovoltaic modules and diode parameter extraction method using multiple linear regression models

Confiabilidad de los sistemas fotovoltaicos autónomos: Aplicación a la electrificación rural

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