Reduced-order model of AC microgrid for stability analysis and adjustment of droop control

Abstract

This paper present a reduced-order small-signal model of microgrid considering an arbitrary number of parallel-connected inverters. The control technique used for inverters is the control without communication based on frequency and voltage droops. Each element of microgrid is modeled in state-space form and all are combined resulting in a single system. Simutation results are presented to show that the proposed model has good accuracy and also to show that it can be used as tool for stability analysis and adjustment of droop control coefficients of the inverters.