Function Controller Design in Tertiary Level for DC Microgrid Clusters

The hierarchical control framework including primary, secondary, and tertiary levels has become a standard solution for control of microgrids (MGs), where the tertiary is responsible for power flow management among clusters of microgrids. This paper presents a predictive function controller (PFC) design in tertiary level for DC microgrid (DCMG) clusters. The loading mismatch among neighbor microgrids is used in an updating policy to adjust voltage set points of the DC microgrids to facilitate the power flow and thus mitigate such mismatch. The design procedure of the PFC controller is detailed, and the simulation model with two interconnected DC microgrids is built in MATLAB/Simulink environment to verify the controller performance.