Photovoltaic-System Hosting Capacity of Low Voltage Distribution Networks
Abstract
In the recent years, there is a strong increase of photovoltaic (PV) systems which are installed in Germany. Most of the PV-systems are connected to the low voltage distribution network. Today a voltage rise up to 3% (FNN2011) of the nominal voltage is allowed by generators connected to the low voltage grid. Staying within the allowed voltage band is one of the major issues. In low voltage grids compared to higher voltage levels we have relatively small short circuit impedance at the connection point, and a relatively large resistive fraction of the network impedance. So often the upper voltage limit is reached even if the thermal capacity of the distribution lines would allow the connection of many more systems.