Application of sequence domain impedances on the stability analysis of ac-grid connected converters

This paper attempts to provide another view of the application of sequence domain analysis to study the stability of ac-grid connected converters. The approach is based on the definition of positive and negative sequence electrical quantities and on the use of the generalized Nyquist stability criterion in its basic form. Thus, a simple expression to perform the stability analysis is obtained, which allows to identify the contribution of each subsystem on the overall system stability.