Harmonic Emission Variability in Identical PV Inverters Installed in Different Solar Farms

The increasing integration of photovoltaic (PV) power plants into electrical grids has raised concerns regarding the harmonic emissions caused by power electronic devices. Understanding the impact of large-scale PV plants on power systems is essential for ensuring grid stability and power quality. This study analyses and compares the current harmonic emissions of two inverters with identical topologies, installed in two different PV plants: a 35 MW plant in Spain and a 12 MW plant in Greece. The results reveal significant differences in the harmonic emission spectra between the two inverters, highlighting the influence of external conditions on the harmonic behaviour of PV inverters. These findings underscore the necessity of considering site-specific factors when assessing the harmonic impact of large-scale PV installations.