The R-S-T digital controller design and applications

摘要

The two degree of freedom R-S-T digital controller is becoming a standard for computer control in industry. The paper presents the methodology for the design of the R-S-T controller which involves identification of the plant model from data combined with a robust control design. The performances of the controller can be further enhanced by plant model identification in closd loop and re-tuning of the controller. For large parameter variations adaptation has to be considered for preserving the performances. Software packages are available for the design, implementation and commissioning of the R-S-T digital controllers. The methodology is illustrated by its application to the control of deposited zinc in hot-dip galvanizing at SOLLAC (Florange, France)