Internal model control of solid state transformer for microgrid stability enhancement

The challenge of integration and control of electric energy posed by microgrid can be addressed by introducing the solid state transformer proposed by the FREEDM center. This research focuses on the voltage regulation issue of SST by adopting dynamic phasor-based modeling and internal model control based nested loop PI control. The main contribution of the paper is use of internal model control design technique for tuning of PI controller. The internal model control method is a systematic model based approach mainly used in process industries. The advantage of the IMC formulation is the tuning of a single parameter for determining the gains of PI controller. The Simulation results demonstrate the effectiveness of the proposed control approach in the presence of load variations and process disturbances.