PV Power Output Variability: Calculation of Correlation Coefficients Using Satellite Insolation Data

This paper describes analytical methods and tools to quantify PV fleet output variability that can be used by utility planners and operators to analyze how short-term PV system output changes may affect utility system stability. This paper analyzes the correlation coefficient of the change in the clearness index between two locations as a function of distance, time interval, and other parameters, and presents a method to estimate correlation coefficients that uses location-specific input parameters.

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