RT21 | OPF Driven UFLS in Low-Inertia Power Grids Hosting Large-Scale BESSs

In this presentation, we present an OPF-driven UFLS application in low-inertia power grids hosting large-scale battery energy storage systems. The proposed method is meant to enhance the performance of emergency operational practices in TSO control rooms by leveraging PMU-fed state estimation process. Thanks to the accurate prediction of the system dynamics subsequent to a large contingency, the adopted OPF-UFLS is capable of minimizing the amount of load to be shed while ensuring a safe trajectory of the system frequency and preventing nodal voltages and branch currents to violate their feasible limits. The performance of the proposed method is assessed by means of OPAL-RT eMEGAsim real time simulator where we reproduce the fully-modeled IEEE 39-bus low-inertia power grids. The OPAL-RT real-time simulation models – available at our dedicated GitHub repository – enables us to replicate the behavior of each grid component and to get a time-domain recording of the network variable in each node.