A Modified $Q-\dot{V}$ Droop Control for Accurate Reactive Power Sharing in Distributed Generation Microgrid

The droop-control technology, which can achieve an autonomous power sharing among distributed resources interface converters, provides the advantages of enhanced system reliability and reduced complexity. However, the reactive power sharing accuracy of the conventional Q - V droop method can be degraded due to its dependence on the line impedances. The Q - V̇ droop-control method was proposed to reduce the influence of line impedance. The reactive power sharing accuracy is improved but still affected by the V̇ restoration operation. In this paper, a modified V̇ restoration mechanism is proposed. Its influence on the power sharing is theoretically explained and analyzed. Both simulation and experiment results are presented to verify the proposed method.