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Impedance-based stability analysis in the dq-domain is a widely appliedmethod for power electronic dominated systems. An inconvenient property withthis method is that impedance models are normally referred to their own localreference frame, and need to be recalculated when referring to a globalreference frame in a given network. This letter presents a simple method fortranslating impedance sub-models within a complex network, from their ownreference frames to any given point in the network. What distinguishes thismethod is that by using a simple rotational matrix, it only needs impedancemodels in their own local reference frames, to be translated to a globalreference in the network. By way of this method, standard circuit analysisrules for series and parallel connection are applicable, as proven in theletter. The method is defined and validated for impedances in the dq andmodified sequence domains, and it is shown that the dependency on referenceframe is marginal in the latter. An additional finding from the application ofthis method is that components or subsystems with a certain symmetry propertycalled Mirror Frequency Decoupling are invariant to the choice of referenceframe.

A simple method for shifting local dq impedance models to a global reference frame for stability analysis