Control design and stability analysis for the cascaded-type AC microgrid

In cascaded-type microgrid, the synchronization and power sharing of distributed generators (DGs) become two new issues that needs to be addressed urgently. In this paper, a unified droop control is proposed and its stability is analyzed in the islanded mode. The proposed scheme can ensure the system stability and accurate power sharing without communication in four-quadrant operations. Finally, simulation and experimental results are presented to verify the system effectiveness. Furthermore, the application of droop control in grid-connected mode would be researched in our future work. The preliminary simulation results are presented in this paper.