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A data‐driven design method for a cascade control system is proposed. The cascade control system consists of inner and outer loops, where the control interval of the outer loop is an integer multiple of the inner loop; hence, the system is a dual‐rate system. In the proposed method, controllers in the inner and outer loops are designed based on one‐shot data. In such a dual‐rate cascade system, since...
A novel polynomial tuning rule is proposed for second order plus time delay system where the time delay is dominant with respect to the time constant. The controller used is a two degrees of freedom PID controller. The rule was found by a curve fitting procedure over data obtained from a series of Pareto optimization with the robustness of the controlled system as constraint. It was found that the...
In this paper the Enhanced Normalized Normal Constrained method is applied to find the optimal tuning of second order PID controllers. This tuning takes into account both the servo and regulatory modes simultaneously, as well as a closed loop robustness criterion. The methodology is successfully applied to a high order linear plant and to a non linear continuous stirred tank reactor model, showing...
In this work, an analysis of multi-objective optimization methods for PI controllers tuning is presented using the Pareto front concept. A new multi-objective method is proposed to find an evenly spaced Pareto frontier which, at the same time, gives the user an idea of the degradation of one of the objective functions. The results are analyzed from a control theory perspective, which include the comparison...
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