On load shedding in microgrids

Similar to conventional systems, having acceptable voltage and frequency is necessary in a MG. MGs have variable nature due to the existence of the generators like PVs. Because of this, the control issue in MGs is important. The stable performance in MGs is realized by grid in grid-connected mode. But it depends on proper controllers in primary, secondary and emergency levels, in islanded mode. Security in MG following a severe disturbance can be established through emergency control like shutdown of any unit, demand side management, islanding and load shedding. In this paper, a MPPT algorithm is used to extract maximum power from PV sources. A controller is designed to stabilize MG performance during islanding. Also, a load shedding plan as one of the last actions to prevent blackout of isolated system is presented.