Under CopyrightKirchhof, J.J.KirchhofKlein, G.G.Klein2022-03-1124.4.20102009https://publica.fraunhofer.de/handle/publica/36434910.24406/publica-fhg-364349enResults of the OPTINOS project - deficits and uncertainties in photovoltaic inverter test proceduresconference paper