Effects of asymmetrically connected PV and battery systems on the node voltages and pen-conductor currents in low-voltage grids

In this work, an exemplarily grid is investigated and analysed concerning the effects of unsymmetrical behaviour of photovoltaic (PV) and battery systems. The voltage values as well as line and neutral conductor currents were evaluated for different unbalance limits per phase. Furthermore, this scheme was applied to a variety of PV distributions within the grid in order to produce generalised conclusions. The overall goal of this work is to investigate whether the prevailing unbalance limit of 4.6 kVA in Germany is still acceptable or if it has to be (and to which amount) adapted.