Hierarchical Power Flow Voltage Assessment of a Multi-Microgrid in Interconnected Operation Mode

This paper presents a voltage assessment of the IEEE six-bus system including two controlled microgrids using the hierarchical power flow approach. Two case studies are presented, the first case considers only primary droop controls for the distributed generation units, and the second case considers primary droop and secondary controls. The results shown that there is a difference in the analysis results if only primary controls are considered or hierarchical controls. In this way, it is shown that the microgrid connection impacts in the overall system voltage profile and indicate that planning analysis, considering the detailed modelling of the different distributed generation units' hierarchical controls, is required for the optimal inclusion of microgrids into the main grid.