Enhanced Power Sharing Accuracy in AC Microgrid with Distinct Local Loads without Communication

Droop-based control techniques are widely employed to achieve proportional power sharing in islanded microgrids without the necessity for communication. The power is dispatched among the distributed generators (DGs) by means of $\omega / P$ and $V / Q$ characteristics for conventional droop-based control techniques or using $\omega / Q$ and $V / P$ characteristics for inverse droop-based control. Accurate power sharing for both active and reactive power is difficult to be achieved simultaneously and inherently by classical droop-based control without coordinated droop characteristics between DGs. The cause of this issue can be attributed to the uneven voltage drop in the feeder lines, and more notably, the existence of unbalanced local loads. These factors collectively contribute to an overall power imbalance within the microgrid. Furthermore, the voltage restoration operation only addresses local voltage restoration, exacerbating the situation. In this paper, a modified droop control technique is proposed to eliminate the effect of power imbalance due to the presence of local loads without the need for communication between DGs. The effectiveness of the proposed modification in the droop-based control technique is validated using MATLAB/Simulink with numerous scenarios.