Practical Evaluation of Geometric Control

Abstract The multivariable control of a two effect pilot plant evaporator are considered. The two disturbances are inlet flow and inlet concentration. These disturbances must not reach the output which is output concentration and hold up in second effect. The object is to create disturbance rejection by application of geometric control. Based on a linearized model the geometric approach is applied to the design problem. The resulting disturbance rejecting control system is, however, not stable so two feedback loops are further added. This control system is evaluated through simulation of and practical experimentation on the pilot plant. The main result is a complete rejection in the output of the disturbances in the input. Since not all elements in the feedback matrix are assigned in this controller it is further evaluated what results can be obtained through pole assignment. These results are presented both from simulation and experimentation.