Estimating the Performance Loss Rate of Photovoltaic Systems Using Time Series Change Point Analysis

Livera, Andreas; Tziolis, Georgios; Theristis, Marios; Stein, Joshua S.; Georghiou, George E.

doi:10.3390/en16093724

Estimating the Performance Loss Rate of Photovoltaic Systems Using Time Series Change Point Analysis

Journal Article · Wed Apr 26 00:00:00 EDT 2023 · Energies

DOI:https://doi.org/10.3390/en16093724· OSTI ID:1971708

; ; ; Stein, Joshua S.;

The accurate quantification of the performance loss rate of photovoltaic systems is critical for project economics. Following the current research activities in the photovoltaic performance and reliability field, this work presents a comparative assessment between common change point methods for performance loss rate estimation of fielded photovoltaic installations. An extensive testing campaign was thus performed to evaluate time series analysis approaches for performance loss rate evaluation of photovoltaic systems. Historical electrical data from eleven photovoltaic systems installed in Nicosia, Cyprus, and the locations’ meteorological measurements over a period of 8 years were used for this investigation. The application of change point detection algorithms on the constructed monthly photovoltaic performance ratio series revealed that the obtained trend might not always be linear. Specifically, thin film photovoltaic systems showed nonlinear behavior, while nonlinearities were also detected for some crystalline silicon photovoltaic systems. When applying several change point techniques, different numbers and locations of changes were detected, resulting in different performance loss rate values (varying by up to 0.85%/year even for the same number of change points). The results highlighted the importance of the application of nonlinear techniques and the need to extract a robust nonlinear model for detecting significant changes in time series data and estimating accurately the performance loss rate of photovoltaic installations.

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Sponsoring Organization:: USDOE

OSTI ID:: 1971708

Journal Information:: Energies, Journal Name: Energies Journal Issue: 9 Vol. 16; ISSN 1996-1073; ISSN ENERGA

Publisher:: MDPI AGCopyright Statement

Country of Publication:: Switzerland

Language:: English

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