Novel method for the improvement in the evaluation of outdoor
The interest in the assessment of performance loss rate (PLR) of Photovoltaic (PV) modules and arrays has been increasing as long as the global installed power expands and
The Performance Loss Rate (PLR) of a research or commercial PV power plant system quan-tifies the decline of the power output over time either as a single assumed linear rate in units of %/a, or %/year, or more recently as a rate over multiple time segments over the lifetime of the system.
The four steps are 1) input data cleaning and filtering, 2) performance metric selection (performance ratio (PR) or predicted power (P) based), corrections and data aggregation, 3) time series feature corrections and finally 4) application of a statistical modeling methods to determine the Performance Loss Rate value and its uncertainty.
Relation between degradation and performance loss rate—PLR expresses all losses as a single rate. Although rarely measured in commercial and utility power plants, continuous module IV curves may give attributes to what drives PLR.
The annual degradation rates determined from the outdoor measurement are lower, with 0.19% ± 0.07% for the reference module and 0.18% ± 0.06% for the string. This results in a difference of only about 0.6% between both methods over the 8 years, which were included for the determination of the long-term degradation rates.
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