Comparison of power quality impact of different photovoltaic inverters: the viewpoint of the grid

This paper presents the results of an experimental analysis performed with the aim of evaluating the effect of many photovoltaic plants on power quality of the grid. Several parameters as voltage and current distortion, flicker, voltage variations at fundamental frequency and power factor have been observed. The measured values have been compared with the limits reported in the standards and, when possible, their dependence on the characteristics of the grid in terms of its impedance has been pointed out.