Abstract
In this paper, a hierarchical distributed controller is implemented in an AC islanded microgrid (MG). For the primary controller, a droop control method is used to share the load active and reactive power between the distributed generators (DGs). However, the reactive power can’t be shared accurately due to the line impedance mismatch. Thus, adaptive virtual impedance based on a consensus algorithm is employed in the secondary controller. The consensus algorithm is used to estimate the impedance mismatch then, the virtual impedance is adjusted to eliminate this mismatch. To verify the effectiveness of the proposed approach MATLAB/Simulink is used to conduct simulations, then an experimental test bench composed of two DGs is developed to validate the simulation results in achieving accurate load power-sharing.
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