  The integration of converter-interfaced generation (CIG) from renewable
energy sources poses challenges to the stability and transient behavior of
electric power systems. Understanding the dynamic behavior of low-inertia power
systems is critical to addressing these stability questions. However, there is
a limited availability of open source tools explicitly geared towards
low-inertia systems modeling. In this paper, we develop an open source
simulation toolbox to study transient responses under high penetration
scenarios. LITS.jl is implemented in the Julia computing language and features
multi-machine modeling capability, a rich library of synchronous generators
components (AVR, PSS, Governor, etc.) and inverter configurations. Several case
studies are conducted and benchmarked and validated against existing toolboxes.
Case studies are selected to showcase the integration of different device
models' behavior in power systems.
