Digital LQ Smith predictor for control of time-delay systems - Design and application

Abstract

This paper deals with a design of universal and robust digital control algorithm for control of great deal processes with time-delay. This algorithm is realized using the digital Smith predictor (SP) based on polynomial approach - by minimization of the Linear Quadratic (LQ) criterion. For minimization of the LQ criterion is used spectral factorization principle with application of the MATLAB Polynomial Toolbox. The LQ criterion was combined with pole assignment principle. The main contribution of this paper is a verification of this algorithm in real-time robust control of an experimental laboratory heat exchanger. The robustness designed control algorithm was examined in term of influence parametric uncertainties - caused by variance of a static gain of the process model. The program system MATLAB/SIMULINK was used for this purpose.