Impact of Volt-Var and Volt-Watt Regulation Curves in the Accommodation of PV Generators to Distribution Systems

In recent years, the integration of distributed generation, particularly solar sources, into the distribution network has increased. However, the current power system control equipment lacks the capability to manage overvoltages at the common coupling point, thereby requiring modifications in control modes through smart inverters to address voltage stability concerns. This study evaluates the effectiveness of Volt-Watt (VW) and Volt-Var (VV) curves in mitigating voltage stability issues in distribution networks with high PV system integration using simulations on the IEEE 34 bus medium voltage distribution system by using OpenDSS and Python. Results indicate that VV curves outperform VW curves, preventing voltage violations while maintaining PV system output close to maximum capacity.