AN ANTIWINDUP SCHEME FOR MULTIVARIABLE NONLINEAR-SYSTEMS

In this paper, an approach to control synthesis for constrained multiv ariable nonlinear systems using feedback linearization is described. T he synthesis of a multivariable saturation element which preserves the directionality of the input vector and produces control action which upholds constraints within the original coordinate system is discussed . Nominal stability analysis is performed using nonlinear mu-analysis for a restricted region of the state-space. A set of conditions is obt ained which defines the region of the state space over which the stabi lity analysis is applicable. The results are applied to both a numeric al example and to a multivariable polymerization reactor model. (C) 19 97 Elsevier Science Ltd.