supervisory control of a hybrid ac/dc micro-grid with load shedding based on the bankruptcy problem

In this paper, a supervisory controller is proposed to manage the power flow in a hybrid ac/dc microgridfor both grid-connected and disconnected modes. when the hybrid ac/dc micro-grid is connected tothe utility grid, power surplus or shortage leads to the power trade between the micro-grid and the utilitygrid. in the grid-disconnected mode, the renewable power sources (wind and solar generation subsystems)are responsible of supplying the power demanded by the loads by themselves. in this case, the loads areclassified as critical and non-critical loads, where critical loads are those that should be supplied in anycondition. when the maximum available power is smaller than the power demanded by the critical loads, thebattery banks are set in the discharging mode to satisfy the demand. otherwise, the non-critical loads aresupplied according to the proposed load shedding scheme, which is developed based on the bankruptcyproblem. in summary, this paper proposes a new supervisory controller for a hybrid ac/dc micro-grid aswell as a new load shedding scheme to supply the non-critical load in grid-disconnected mode. theeffectiveness of the proposed supervisor controller is evaluated through simulation.