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  • Open Access

Spectral analysis of solar-irradiance fluctuations

G. Bel1,2,* and M.M. Bandi3

  • 1Department of Environmental Physics, Blaustein Institutes for Desert Research, Ben-Gurion University of the Negev, Sede Boqer Campus 84990, Israel
  • 2Department of Physics, Ben-Gurion University of the Negev, Beer-Sheva 84105, Israel
  • 3Nonlinear and Non-equilibrium Physics Unit, OIST Graduate University, 1919-1 Tancha, Onna-son, Okinawa 904-0495, Japan

  • *bel@bgu.ac.il
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Phys. Rev. Applied 21, 034019 – Published 12 March, 2024

DOI: https://doi.org/10.1103/PhysRevApplied.21.034019

Abstract

Solar-irradiance fluctuations possess a power-law spectrum with two different slopes in the intermediate (1/day <f<1/h) and high [1/h <f<1/(2 min)] frequency (f) regimes. This spectrum is a combination of a deterministic (latitude-dependent) variation of daylight duration and a stochastic component arising from various environmental attenuation factors. We propose a principled approach to decompose the solar-irradiance time series into the deterministic location-dependent clear sky and the stochastic environmental attenuation signals. Such decomposition permits one to systematically analyze the solar photovoltaic power-fluctuation spectra after accounting for the strong geographic dependence, failing which no baseline standard exists with which to compare spectra between disparate geographic locations. Our analysis for two different locations shows that the stochastic environmental factors determine the spectral power-law slope in the high-frequency range, while the deterministic clear-sky signal plays a role in the intermediate frequency range. We close by discussing its implications for solar photovoltaic power production, in particular, for the geographic smoothing of fluctuations.

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Phys. Rev. Applied 21, 034019– Published 12 March, 2024
  • Received 13 September 2023
  • Revised 9 January 2024
  • Accepted 26 January 2024
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Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article's title, journal citation, and DOI.

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