Effect of Reconfiguration and Meshed Networks on the Small-Signal Stability Margin of Droop-Based Islanded Microgrids

This paper studies and analyzes the effect of reconfiguration and network type (mesh/radial) on the small-signal stability margin of a droop-based islanded microgrid. Eigenvalue analysis is performed on three systems: a low-voltage microgrid, the standard IEEE 33-bus islanded system with three and five sources, and the standard IEEE 69-bus islanded system with three sources. From eigenvalue analysis, it is observed that the reconfiguration and network type have notable impact on the small-signal stability margin. The analysis and analytical results are initially verified and confirmed through time-domain simulations using MATLAB/SIMULINK for the system considered. Experimental results are demonstrated on the developed microgrid prototype to support the claims and validate the proposed analysis and results.