Design procedure for nonlinear multivariable processes control

This study presents comparative results of real time implementing of three methods for control a multivariable process with nonlinear static characteristics. The first two methods are classic and are based on decentralized control and respectively, oil static decoupling procedures. The third proposed method is developed using a combined feedforward and feedback control scheme with nonlinear compensators. The use of this last structure imposes solving some specific problems, like process's static characteristic determination, construction of a nonlinear compensator or robust control law design. The applicability of the proposed method and of the two classic methods is proved using a real-time structure based on RST control algorithms. In the end, its software implementation and the obtained results are also shown.