Abstract
Droop control has limitations with respect to current sharing since the output current delivered by the inverters depends on their output impedance ratios. In addition, harmonic voltage drops due to the flow of harmonic currents induce voltage distortion at the point of common coupling (PCC). Virtual impedance loops were proposed in literature to improve the current sharing between the inverters by normalizing the output impedance of the inverters. However, virtual impedance loops have constraints in this respect since the improvement in the current sharing occurs through redistribution of the current harmonics which can add to the voltage distortion at the PCC. This paper compares the performance of resistive, inductive, inductive-resistive and resistive-capacitive virtual impedance loops with respect to current sharing and voltage harmonic distortion at the PCC. Simulation results are given for a single phase microgrid setup to achieve a fair performance comparison of the different virtual impedance techniques.
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