Contents I. Introduction
Two of the most important design criteria for multimachine power systems are transient stability and damping of electromechanical modes of sustained oscillation [1]–[3]. These two design criteria have assumed even greater importance in the wake of recent interconnection blackouts in the U.S., Canada, and Europe [4]. The focus has almost exclusively been on the second criterion, oscillation instability as cured by suitably tuned power system stabilisers (PSS) attached to appropriate generators [5]–[22]. Particular emphasis is given to the performance of PSS devices [5], [6], but without direct reference to the performance of interacting generator automatic voltage regulator (AVR) devices.
