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A feedback min-max MPC algorithm for LPV systems subject to bounded rates of change of parameters

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3 Author(s)
A. Casavola ; Dipt. di Elettronica, Informatica e Sistemistica, Universita degli studi della Calabria, Rende, Italy ; D. Famularo ; G. Franze

A novel closed-loop model-based predictive control (MPC) strategy for input-saturated polytopic linear parameter varying (LPV) discrete-time systems is proposed. It is postulated that the plant belongs to a polytopic family of linear systems, each member of which being parameterized by the value that a parameter vector assumes in the unit simplex. Such a parameter can be measured online and used for feedback while a bound on its rate of change is known and exploited for predictions. The paper extends the MPC scheme presented by Lu et al. (2000) for the restricting case of 1-step long control horizons to the general case of control horizons of arbitrary length N. This is done by suitably modifying the robust MPC scheme presented by Casavola et al. (2000) for uncertain polytopic systems. The feasibility and closed-loop stability of this strategy are proved and a numerical example is also presented in order to show how the freedom of extending the control horizon and knowledge of the parameter is significant in order to improve the performance of the control strategy

Published in:

IEEE Transactions on Automatic Control  (Volume:47 ,  Issue: 7 )