| It is often necessary to control a single variable by coordinating the manipulation of several variables and doing so interaction occurs, bringing sometimes as a result unstable behavior in the process. Multivariable systems are generally complex because controlling one variable may affect the others; even a simple process with 1 variable to control, no matter how nicely configured, may present unsatisfactory results. That is why a proper control should be provided to offset any type of instability. Decoupling is a form of control, whose main objective is to cancel the undesirable effects of interaction in the process.; The purpose of this thesis is the study of a multivariable process control is a distillation column that separates benzene out of the top stream and toluene out of the bottom stream. To achieve this goal interaction between controllers will be study, and the decoupling as a form of control. Framework of multivariable, multiloop control theories will be reviewed and analyzed. Simulation using control station software will be performed and results based on decoupling theories will be presented and discussed. Finally tuning rules will be developed and tested. |
