A small signal model of an inverter-based microgrid including DC link voltages

In this paper, a small signal model of an islanded microgrid containing any number of parallel inverters is developed. Each inverter is modelled as an ideal voltage source with an equivalent output impedance as the dynamics of the inner voltage loop controller is significantly faster than the dynamics of the power control loop and DC link voltage, which is included in the model. The model, therefore, can be used to study the dynamics of the DC link voltages during unintentional islanding in addition to analysing the dynamics of the power flow controllers. The model is validated using Matlab/Simulink simulations.