On interconnections of "mixed" systems using classical stability theory

Wynita M. Griggs*, S. Shravan K. Sajja, Brian D.O. Anderson, Robert N. Shorten

*Corresponding author for this work

    Research output: Contribution to journalArticlepeer-review

    9 Citations (Scopus)


    In this paper, we derive stability results for large-scale interconnections of "mixed" linear, time-invariant systems using classical Nyquist arguments. We compare our results with Moylan and Hill (1978) [8]. Our results indicate that, if one relaxes assumptions on the subsystems in an interconnection from assumptions of passivity or small gain to assumptions of "mixedness," then the Moylan and Hill-like conditions on the interconnection matrix become more stringent. Finally, we explore a condition for the stability of large-scale, time-varying interconnections of strictly positive real systems. This condition mirrors the condition obtained in [8] for time-invariant interconnections and is thus an extension of this work.

    Original languageEnglish
    Pages (from-to)676-682
    Number of pages7
    JournalSystems and Control Letters
    Issue number5
    Publication statusPublished - May 2012


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