Frequency-Dependent Droop Control for Distributed Generation in Microgrids

Inhalt:
This paper proposes a frequency-dependent droop control scheme to coordinate multiple inverter-interfaced distributed generation (DG) systems in a microgrid. By tuning the output impedances of individual inverters to be frequency-dependent, system real and reactive power can be proportionally shared by different DGs according to their capacities, while harmonic power can be mainly supplied by those inverters with high switching frequency or control bandwidth, such that good power quality can be assured for the microgrid. Simulation results are provided to verify the effectiveness of the proposed control.