Control and Power Management of a PV-Diesel-ESS Based Microgrid in an islanded Mode

Abstract

This paper proposes the control and energy management of a PV-Diesel-ESS micro-grid in islanded mode, where a two-level hierarchical control technique is adopted, the lower-level control to optimize/control the power from of the microgrid’s components, then comes the higher-level control to supervise the power flow and ensure its balance on the whole system while promoting self-consumption under a lowcost system. The proposed supervision algorithm manages the power flow according to the state of charge of the battery, which results in four modes of operation. To test the effectiveness of this supervisory algorithm, either to maintain the system frequency and voltage within their standard limits or to guarantee the continuity of power supply to the load and protect the energy storage system against over-charging /over-discharges, MATLAB simulation, for the whole system, is carried out for an exemplary day and under different critical scenarios and circumstances.