Abstract
Load behavior can significantly influence power system oscillations and the paper explores this interaction. Based on a generic load model, it is shown that loads provide a feedback, which can be used to influence system damping. The result is achieved through a MIMO (multi inputs/multi outputs) minimal realization algorithm based on a singular value decomposition (SVD). Feedback interpretation of load dynamics underlies this technique. The development of accurate load models on a system wide basis, the assessment of their impact, and the design of reliable and accurate load modulation in large-scale studies are a formidable task. To mitigate this problem several approaches are illustrated to take into account uncertainties on load behavior and modulation. This culminates into a damping control obtained with the Liapunov theory and the generalized Popov criterion. A variable structure linear state feedback controller, in terms of the controls at the vertices of the polyhedral output constraint set, is presented. The concept is illustrated and demonstrated by simulation runs on the 9-bus 3-aeras WSCC test system and a representation of the Hydro-Québec network.
Published Version
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