Reactive Power-Sharing in Group-based AC Islanded Micorgids with Switching Topology

Abstract

This study proposes a cooperative distributed controller to acquire voltage regulation and reactive power-sharing in AC islanded MGs, classified into multiple groups. A hierarchical two-layer communication network is considered in the controller design to reduces high-bandwidth lines, augment system reliability, and decrease the probability of single-point failure. The lower network layer locally obtains voltage regulation and reactive power-sharing in each group of DGs. Groups exchange information in the higher network layer to globally accomplish stability and proper performance. A switching network having the weakest connectivity for both communication layers graphs are considered to acquire robustness concerning link failures and data dropouts. Effectiveness of the control approach is assessed by simulating an AC islanded MG with 9 bus in MATLAB/Simulink under different scenarios.