Precise ratio control structure for nonlinear blend processes

This paper proposes a precise structure solution for the ratio control of nonlinear processes blend stations. The main feature of the proposed structure is to give a good ratio performance for both set-point changes and load disturbances that might occur in any one of the loops. For each loops (two or more) a nonlinear structure based on a multiple model and nonlinearity compensator is proposed. The main advantages consist in a classic tuning procedure for each of the controllers and a very simple procedure for nonlinearity determination, suitable for industrial applications. All components of control structure ware implemented on real time control application.