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The following article presents the modeling and control of a refrigeration system for fruit preservation. The mathematical model developed is based on mass balance and energy balance. It has been developed in two blocks: analysis in the refrigeration components and analysis in the conservation chamber. In the refrigeration system the elements have been studied: compressor, condenser, expansion valve,...
A hierarchical model predictive control for the biological treatment process of an activated sludge wastewater treatment plant is presented. On the basis of a previously developed PI control for the dissolved oxygen concentration and air pressure in the aeration system, an improved optimization strategy based on Model Predictive Control (MPC) is added. The MPC based control loop keeps the output substrate...
This paper presents the shortcomings of traditional PID method in coal mill control, such as multivariable coupling, nonlinearity and large-time delay, and give a new method to solve the problems. Firstly, the principles of coal mill is presented, and a coal mill model is established. Then we use prediction error method to identify the parameters of the model based on datas. Next, the paper estimates...
A multivariable predictive control strategy characterized by a variable prediction horizon is proposed and evaluated Simplicity of use is obtained by utilizing a single-point prediction scheme and linear programming techniques to satisfy process constraints. The prediction horizon is adjusted automatically. The technique requires fewer tuning parameters than a multivariable PID structure. Experimental...
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