  In this paper we present the development of an open-source simulation
toolbox, PowerSimulationsDynamics.jl, to study the dynamic response of power
systems, focusing on the requirements to model systems with high penetrations
of Inverter-Based Resources (IBRs). PowerSimulationsDynamics.jl is implemented
in Julia and features a rich library of synchronous generator, inverter, and
load models. In addition, it allows the study of quasi-static phasors and
electromagnetic dq models that use a dynamic network representation. Case
studies and validation exercises show that PowerSimulationsDynamics.jl results
closely match other commercial and open-source simulation tools.
