Stability analysis of islanded microgrids with dynamic loads

In this paper, a framework for stability analyses of a typical inverter-based islanded microgrid with a non-linear load is presented, namely ideal constant power load (CPL) which is supplied by tightly regulated power electronics converter. The whole dynamic model of the considered microgrid is firstly developed, based on which the small signal model of system is deduced at stable operating point. Afterwards, eigenvalue-based stability analysis and parametric sensitivity analysis are accomplished based on the obtained small signal model to predict the system's unstable regions and identify the effects of parameters on the stability boundaries. Simulation studies based on Matlab/Simulink are finally done to verify the theoretical analyses.