Publisher Summary Control structure selection consists of selecting controlled variables, manipulated variables, measurements, and links among them. A systematic procedure for control structure selection is applied to the evaporation process. Promising sets of controlled variables are selected based on steady-state economic criteria. The objective is to find sets of controlled variables that with constant set points keep the process close to the economic optimum (“self-optimizing control”) in face of disturbances and implementation errors. Stabilization and controllability analysis is performed for the most promising sets of economic controlled variables. The evaporation process example has been used to illustrate how important the selection of control structure is and how rewarding it may be. By putting serious effort in selecting a good control structure, it is possible to avoid significant control problems and reduce the complexity of the control system.
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