A sugar factory needs several overall control systems: one .for dynamic optimization of production scheduling, another for two level, static system optimization of the technological line, and another for system coordination of mass flows.
Smmmary---Chan8~ in the quality, inaccuracy of the dosage of energy and materials streams, sudden oscillations of the mass flows, these are the main factors which cause the losses in the sugar production. To minimize these losses an optimizing control, structured as a multilayer system is proposed.
The first layer consists of a stabilizing control. The set points of the controllers are determined by local static optimizers. The losses in the whole technological line are minimized by the global static optimizer which coordinates the work of the local optimizers. The desired production rate is presented as a solution to a dynamic optimization problem --the scheduling problem.
If a temporary limitation of the desired production rate is caused for any reason, then a mass flow coordination system is called upon to control flow rates in different parts of the technological line, and thus minimize the loss. When the limitation is over, the coordination system brings the line to the previous optimal steady state under the control of the static optimizers. *