Daniele Casagrande

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We consider a plant the dynamics of which switch among a family of systems. Each of these systems has a single stable equilibrium point. We assume that a constraint region for the state is assigned and we consider the problem of finding suitable limitations on the commutation speed in order to avoid constraints violations, even in the absence of state(More)
— The problem of equivalence is considered for nonlinear single-input single-output systems defined on homogeneous time scales and described by n-th order input-output delta-differential equations. First the concepts of reduction and of irreducibility of an input/output equation are explained. Subsequently, based on these notions, a definition of(More)
A general methodology to globally stabilize an equilibrium of a class of non-globally linearizable triangular systems is presented. The technique is applicable to all triangular systems described by analytic vector fields. The method is used to give an explicit solution to the challenging problem of transient stability of multimachine power systems with(More)
The paper deals with the stabilizability of linear plants whose parameters vary with time in a compact set. First, necessary and sufficient conditions for the existence of a linear gain-scheduled stabilizing compensator are given. Next, it is shown that, if these conditions are satisfied, any compensator transfer function depending on the plant parameters(More)
— The problem of the asymptotic stabilization of a five dimensional nonholonomic systems, namely the " ball and plate " or " rolling sphere " system, is discussed and solved by means of a hybrid control law relying on a suitable finite state machine. A control law is associated to each state of the machine and, by using a simple switching strategy, the(More)
The problem of asymptotic stabilization for a class of nonholonomic systems is studied and solved by means of a hybrid control law which makes use of a (deterministic) finite state machine. It is shown that, by using a simple switching control scheme, the origin is a globally asymptotically stable equilibrium in the sense of Lyapunov. The control law can(More)
— In this paper it is shown that the controller design methodology recently introduced by the authors to stabilize non–globally feedback linearizable triangular systems solves the long–standing problem of transient stabilization of multimachine power systems with non-negligible transfer conductances. The 3n–dimensional (aggregated) model of the n-generator(More)