Active constraint switching with the generalized split range control structure using the baton strategy

Abstract

Abstract Split range control is used to extend the steady-state operating range for a single output (controlled variable, CV) by using more than one input (manipulated variable, MV). In the context of optimal operation, this advanced control structure can be used for active constraint switching, also in combination with selectors. The generalized split range control structure analyzed in this paper overcomes the limitations of standard split range control in terms of tuning by using multiple independent controllers with the same setpoint. By using the baton strategy, this structure avoids undesired switching between the controllers. In this contribution, we implement in this novel control structure in a simulation case study of a mixing process in which we must switch the MV used to control a high priority CV due to MV saturation.