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Series cascade control structure (SCCS) is widely used in process industries as unity feedback configuration fails to reject the load disturbances before the controlled variable deviates from the setpoint. Several variants of the conventional SCCSs have been reported in the literature to obtain improved closed-loop performance as compared to the conventional structure. For processes with large time...
A number of tuning rules have been reported in literature for unstable first order plus time delay processes. However, at least to the author knowledge most of the reported methods fail to give robust performance for process models with time delay equal to or greater than the process time constant. In this work, a robust tuning method based on the modified Smith predictor is proposed for unstable...
In process industries, parallel cascade control structures are widely used to improve the dynamic performance in the presence of disturbances. Majority of the parallel cascade tuning strategies reported in the literature focuses on stable process models. Hence, this article presents an improved tuning strategy for time delayed integrating process models. The proposed parallel cascade control structure...
A set of new tuning rules for fractional-order controllers for integrating and unstable processes are proposed in this study. The tuning rules are proposed in order to minimize the IST2E performance criterion. Furthermore, analytical expressions are devised for the optimal values of the performance indexes. The performance indexes may be used to assess the controller performance for a given process...
In process industries, cascade control is one of the commonly used techniques to improve the performance of a single loop control structure when there are disturbances associated with the manipulated variable. In the present work, tuning rules have been proposed for series cascade control structure considering stable and integrating process models with time delay. The primary controller is a Proportional-Integral-Derivative...
This article presents a comparative study of the closed loop performances that can be achieved by the PI tuning methods reported in the literature for integrating plus time delay process models. Guidelines are provided to help the user for selecting the tuning strategy for servo and regulatory applications, respectively. The performance measures used for comparison are the integral of squared error...
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