Under CopyrightAckermann, FlorianFlorianAckermannMoghadam, HasanaliHasanaliMoghadamRogalla, SönkeSönkeRogallaSantjer, FritzFritzSantjerAthamna, IssamIssamAthamnaKlosse, RainerRainerKlosseMalekian, KavehKavehMalekianAdloff, StephanStephanAdloffMeyer, Marc FlorianMarc FlorianMeyerKaatz, GesaGesaKaatzSchulz, DetlefDetlefSchulzBitz, AlexanderAlexanderBitzSchaefer, NilsNilsSchaeferFricke, BjoernBjoernFrickeGhouti, Mohamad ElMohamad ElGhouti2022-03-1327.6.20182017https://publica.fraunhofer.de/handle/publica/40074010.24406/publica-fhg-400740Wind- and PV-power plants must respect harmonic emission limits in order to pass the certification process. Estimating the harmonic emission of a power plant, based on the measurement of a single unit still is a challenging task. German research project ""NetzHarmonie"" has been initiated in 2015 with the final aim to propose improved rules for the characterization of the harmonic emissions of wind- and solar power generation units (PGU). This paper presents specific measurement results regarding summation rules in Wind- and PV-power plants.enharmonic summationinverterharmonic modellingbackground distortionnetwork impedanceElektrische EnergiesystemeEnergiesystemtechnikLeistungselektronikSummationinvertermodelling621697conference paper