Optimizing solar panel integration in low voltage networks: utilizing short-circuit current and Q(V)-characteristics

In low voltage networks, distributed generation poses significant challenges due to voltage rise and rapid voltage change. In low voltage networks, there can be low short-circuit currents at the connection point. This study investigates the method of using the short-circuit current at the connection point to estimate the maximum generation before the maximum voltage level and rapid voltage change is violated. The new EN 50549-1 standard and Finnish Energy recommendation ofQ(V)-characteristics are investigated to estimate their role in increasing the amount of allowed generation at the connection point characterized by the short-circuit current. As a result, we obtain curves for the allowable amount of generation of the inverter as a function of short-circuit currents. The findings will determine the maximum solar panel size for a single connection point before its self- induced voltage rise or rapid voltage change is violating standards and recommendations. This method can relax overly restricting rules that may limit the present allowed solar panel generation at the customers’ premises and withdraw non-necessary network upgrades and delays when deploying distributed solar generation. This way the study seeks to promote faster renewable energy growth, thus contributing to a more sustainable energy future.