Photovoltaic System Performance Index

<p>  The synthetic data is generated loosely following the concepts developed by Skomedal and Deceglie (2020)   <a href=https://doi.org/10.1109/JPHOTOV.2020.3018219 target=_blank>1</a>,   <a href=https://github.com/asmunds/simulate_pv_time_series target=_blank>2</a>.   Instead of producing the performance index through a normalization step, like with the real data, the synthetic data performance index is generated as a product of five synthetically generated components: system change, seasonality, soiling, performance loss rate, and the residuals.</p>