A hybrid central-distributed control applied to microgrids with droop characteristic based generators

Many authors have conducted power flow analysis as a tool to operate microgrids in a coordinate manner. Some of them have combined a central management with a back-up distributed control. In this paper, a management system based in this previous concept is studied. What we proposed is an optimum power flow method to be applied to microgrids in which the generators are connected through power converters with droop characteristic based control. In this kind of microgrids, the frequency is not constant and must be considered as a variable to correctly estimate the power flow. The central management is combined with distributed control to guaranty the stability in case of communication failures.