Conductance-frequency droop control to ensure transient stability of inverter-based stand-alone microgrids

Currently, inverter-based stand-alone microgrids are gaining interest due to the advantages of obtaining energy from renewable sources. To manage operation, these include storage systems connected in parallel PCC through electronic inverters that controlled as voltage sources order support frequency and at PCC. For purpose ensuring P Q sharing among also synchronization stability microgrid, droop control is widely used, achieving a satisfactory performance normal operation. Nevertheless, presence overloads or short-circuits, must limit current for self-protection, thereby modifying system then becomes prone suffer transient problems. In this paper, first with conventional P-f Iact-f droops analyzed, boundaries during limitation. always ensure system, paper proposes G-f consists employing equivalent conductance seen by each inverter its control. Furthermore, variable correctly represents power angle, dynamics not affected operating conditions. The theoretical results have been validated means simulation Hardware-In-the-Loop results, showing superior proposed droop.