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The interactions between input/output variables are a common phenomenon and the main obstacle encountered in the design of multi-loop controllers for interacting multivariable processes. In this paper, a method for controlling multivariable processes is presented. The controller design is divided into two parts: firstly, a decoupling matrix is designed in order to minimize the interaction effects...
The pressure system of gas collectors of coke oven is a multivariable non-linear process. A new model of the fuzzy control using the genetic algorithm for the pressure system of gas collectors of coke oven is proposed in this paper. The improved genetic algorithm is an on-line technique and is used to optimize the parameters of the fuzzy controller and to eliminate coupling of the pressure between...
This paper examines the feasibility of using disturbance observers (DOs) to compensate for interactions between control loops in non-linear multivariable systems. A distillation column application is considered. Traditionally, both steady-state and dynamic decouplers, designed using a linear model of the nonlinear system, are used to improve the multi-loop control of distillation columns. The multi-loop...
Economic performance assessment (EPA) remains important to predict and verify the benefits from process control systems. In the latest techniques of EPA, performance functions (PFs) have an essential function. However, to the extent of the authors' knowledge, there has been no systematic approach to developing PFs. In this paper, a methodology for developing PFs is given and two case studies are given...
A systematic control strategy is proposed for the optimal operation of multi-unit systems undergoing a partial shutdown. The strategy entails manipulating the degrees-of-freedom available during and after a shutdown such that production is restored in a cost-optimal fashion while meeting all safety and operational constraints. In this work, we investigate the coordination of buffer tanks, production...
Stable control of a coal-pulverizing system with ball-tube mill usually cannot be hold due to some disturbances, such as coal hardness and steel ball wearing, etc. A hierarchical structure with a direct control layer and a set-point optimization layer is applied to this typical system. Based on steady-state gain models of different operating points, a grid search method is employed to calculate optimal...
In this paper, a new technique for on-line multivariable process identification in the frequency domain based on a simple experimental test is presented. Step changes in the controller set point are performed on the process so that the process frequency-response matrix is estimated with signal decomposition and analysis method in the frequency domain, and accurate transform-function matrix is identified...
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