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Utility plants, widely used in production plants, are expanding according to the increasing steam and electricity demand along with the extension of the existing production process. Utility plants are often installed in a distributed way, i.e., different locations within the production plant due to space limitation and for the best arrangement for the process facilities. In order to operate the distributed utility plantsoptimally and efficiently, we propose a new control system which is based on the integration of the coordinated control system with two degrees of freedom PID control, and model-based optimization techniques. The proposed system can provide optimal coordinated control of distributed utility plants which include a number of steam boilers, steam or gas turbines, and generators coping with different steam and electricity demands. We have obtained encouraging simulation results in terms of better control performance, and significant reduction in fuel and electricity consumption cost with lower CO2emission for the case of the Goodyear Beaumont’s chemical plant. In this paper, along with simulation results, the coordinated control system with two degrees of freedom PID control and optimization techniques is discussed.
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