Autoidentification Method of the “Trouble Maker(s)” for Internal Instability in Multiparalleled Inverters System

The instability of power systems comprising multiple LCL-filtered grid-connected dc–ac inverters connected in parallel can be caused by any individual inverter due to mutual coupling through the grid impedance. For stability analysis a multiparalleled system, an effective technique capable diagnose which particular (i.e., “trouble maker”) causes overall system has not been developed yet. In this article, novel autoidentification method is proposed detect maker(s)” based on comparison between root-mean-square value harmonic voltage at point common and voltages across filters capacitors. theoretical identification presented details article. Also, simulation experimental results are provided for verification effectiveness technique.