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This paper presents a method for a analyzing'charActeristic harmonic current propagation into an AC system. Frequency dependent models of AC network elements and loads have been developed for the appropriate range of frequencies. This methodology is applied to two different systems and the responsesof individual elements and the system as a whole were observed. The harmonic current flows in the systems appear to be related-to certain characteristics of the system and its elements. Input impedance at harmonic frequencies, the magnitude. of shunt capacitances on transmission lines, the size and location of the converters, and the representation of system loads are all found to be factors in cdetermining the magnitude of harmonic current flows in system elements.