Impact of distributed generation's local regulations P(f) and Q(U) on stabilization of unintentional islanding situations on the distribution network

Due to its strong development, decentralized generation is increasingly required to contribute to the safe operation of the power system. A P(f) regulation that reduces active power generation in case of abnormally high frequency is part of the “Requirements for grid connection of generators” of ENTSOE. Also a Q(U) local voltage regulation that uses reactive power is now required by Distribution Network Operators. Both regulations Q(U) and P(f) have been developed for stabilization of the power system in normal operation. So, a question arises about their potential stabilization effect in case of unintentional islanding situations on the distribution network. Through a theoretical assessment and reference to the behavior of real networks, this paper shows that P(f) and Q(U), acting without…