A modified droop control for reactive power sharing in large microgrids with meshed topology

The high penetration of distributed energy resources (DERs) into smart grids has triggered a move towards microgrids with complicated topologies. Droop control approaches have proven to be the most practical approach to realize plug and play capability in microgrids. While droop control methods have been a focal point of research interest in the power systems control community, most of the previous works have been devoted to improve the efficiency of droop controllers in microgrids with simple architectures and distributed generators (DGs) operating in parallel. This paper presents a new approach to design DG's output virtual inductance control loop to improve the reactive power sharing among DGs in microgrids with meshed topologies. The proposed approach in this paper utilizes the Kron reduction method and nonlinear optimization tools to find the optimal values of the DGs' output virtual inductances to enhance the reactive power sharing between DGs' power electronic inverters.