Extraction of equivalent impedance of photovoltaic panel under its actual operating conditions

Electromagnetic interference (EMI) is a growing concern for the implementation of photovoltaic (PV) systems. Widespread use of PV panels with high switching frequency power converters can result in significant EMI emission. Hence, an accurate circuit model of the PV panel under its actual operating condition is necessary so that the impact of impedance variation of the PV panel on EMI can be better evaluated. In this paper, an in-circuit measurement based method is adopted to extract the necessary parameters of the impedance model of the PV panel to facilitate the study of its impedance variation on EMI in the frequency range of interest.