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Technical Briefs

The Time-Variant Degradation of a Photovoltaic System

[+] Author and Article Information
A. Charki

e-mail: abderafi.charki@univ-angers.fr

D. Bigaud

University of Angers LASQUO-ISTIA,
62 avenue Notre Dame du Lac,
49000 Angers, France

Contributed by the Solar Energy Division of ASME for publication in the Journal of Solar Energy Engineering. Manuscript received February 11, 2012; final manuscript received September 20, 2012; published online November 1, 2012. Assoc. Editor: Santiago Silvestre.

J. Sol. Energy Eng 135(2), 024503 (Nov 01, 2012) (4 pages) Paper No: SOL-12-1036; doi: 10.1115/1.4007771 History: Received February 11, 2012; Revised September 20, 2012

This article presents a method developed for carrying out the energy production estimation considering the energy losses in different components of a photovoltaic (PV) system and its downtime effect. The studied system is a grid-connected photovoltaic system including PV modules, wires, and inverter. PV systems are sensitive to environmental conditions (UV radiation, temperature, humidity) and all components are subjected to electrical losses. The proposed method allows obtaining the production of photovoltaic system and its availability during a specified period using meteorological data. The calculation of the production takes into account the downtime periods when no energy is delivered in the grid during this period. The time-to-failure and the time-to-repair of photovoltaic system are considered following a Weibull distribution. This method permits to have a best estimation of the production throughout the lifetime of the photovoltaic system.

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References

Figures

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Fig. 1

Studied photovoltaic system

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Fig. 2

Analytical profile for daily solar illumination

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Fig. 3

Determination of VAC(t)

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Fig. 4

Energy production with loss by year

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Fig. 5

Energy production, case of Data 1

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