Numerical Validation of an Algorithm for Combined Soiling and Degradation Analysis of Photovoltaic Systems

Numerical Validation of an Algorithm for Combined Soiling and Degradation Analysis of Photovoltaic Systems

Publisher: IEEE
Michael G. Deceglie ; Matthew Muller ; Dirk C. Jordan ; Chris Deline

Abstract:

We describe and demonstrate an open-source algorithm for simultaneously quantifying degradation and soiling of photovoltaic (PV) systems from energy-production time series data. The new analysis is based on year-on-year degradation rate analysis combined with stochastic rate and recovery soiling analysis. The algorithm is designed to fit into the workflow provided by RdTools, a Python module maintained by NREL and collaboratively developed with the community, which provides a framework and functions for degradation and loss-factor analysis of PV field data. We demonstrate the method on numerically simulated PV data sets and show that it reduces the root-mean-square error of the P50 degradation rate estimate when soiling is present

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