Two-degree-of-freedom controllers for multivariable model-matching systems: Application to a continuous stirred tank reactor (CSTR)

Abstract

In this paper we study a robust control problem by the approach of model-matching design with a two-degree-of-freedom controller. First we give a parametrization of all stabilizing compensators from the viewpoint of independent design of feedforward and feedback controllers. Second, utilizing the modern Wiener-Hopf method, we solve the optimal robust control problem. The proposed controller can directly deal with the intrinsic problem of process interaction, plant uncertainty and controller saturation irrespective of whether the plant is stable or unstable. The design method is applied to a continuous stirred tank reactor (CSTR) system. Computer simulation shows results with satisfactory performance.