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Localized Spectral Analysis of Fluctuating Power Generation from Solar Energy Systems

EURASIP Journal on Advances in Signal Processing20072007:080919

https://doi.org/10.1155/2007/80919

Received: 27 April 2006

Accepted: 23 December 2006

Published: 21 February 2007

Abstract

Fluctuations in solar irradiance are a serious obstacle for the future large-scale application of photovoltaics. Occurring regularly with the passage of clouds, they can cause unexpected power variations and introduce voltage dips to the power distribution system. This paper proposes the treatment of such fluctuating time series as realizations of a stochastic, locally stationary, wavelet process. Its local spectral density can be estimated from empirical data by means of wavelet periodograms. The wavelet approach allows the analysis of the amplitude of fluctuations per characteristic scale, hence, persistence of the fluctuation. Furthermore, conclusions can be drawn on the frequency of occurrence of fluctuations of different scale. This localized spectral analysis was applied to empirical data of two successive years. The approach is especially useful for network planning and load management of power distribution systems containing a high density of photovoltaic generation units.

Keywords

Spectral DensityEmpirical DataCharacteristic ScaleSolar IrradianceGeneration Unit

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Authors’ Affiliations

(1)
, Brussels, Belgium
(2)
Departement Elektrotechniek, Katholieke Universiteit Leuven, Leuven, Belgium
(3)
, Tienen, Belgium

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Copyright

© Achim Woyte et al. 2007

This article is published under license to BioMed Central Ltd. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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