Özet:

The gradual increase in power generation from renewable energy sources (RES), results in a reduction in power system inertia. It adversely affects the stable operation of the microgrids that contains high penetration of RES. The frequency stability concerns caused by the penetration of RES in the grid-connected system is controlled by synchronous generator (SG). Whereas in the stand-alone microgrid, which entails of RES deteriorates the frequency stability under power imbalances. The emulated inertia control (EIC) technology used for the power electronic inverter mimics the inertia of SG. EIC provides an effective solution for power systems with low inertia. This paper analyses the performance of EIC applied to the stand-alone microgrid that comprises of RES only. The utilization of EIC in stand-alone microgrid successfully addresses the frequency stability issues under solar irradiation and load variations. Furthermore, the small-signal stability analysis of the EIC is performed to analyze the stability under parameter variation. The simulation analysis shows that the frequency response and DC bus voltage is regulated in sudden disturbances with EIC as compared with constant voltage constant frequency (CVCF). The proposed EIC strategy is tested and compared with CVCF using the hardware in the loop (HIL) simulation with the help of real-time simulator OP5700 to verify the feasibility.<

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