Supraharmonic interactions between multiple devices within different local low voltage grid structures

Abstract

In this paper, the effects of the interaction between multiple devices and with the low voltage grid concerning the devices’ supraharmonic or high frequency emission and immunity in the frequency range between 2 kHz and 150 kHz are presented based on a laboratory set up. This set up consists of two photovoltaic (PV) inverters that represent the main source of supraharmonic disturbances and three typical household devices for a realistic depiction of a typical local grid structure. In order to determine the impact of the grid impedance, the whole installation is connected to six different grid impedances that are derived from previously performed grid impedance measurements within the research project VeNiFre150. The corresponding grid impedance values are also shorty presented.