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Author: search.filters.author.Ukakimaparn, PrapartSubject: search.filters.subject.Kitti’s method

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    Discrete-time posicast PID×(n − 2) stage PD cascade controllers for unstable system
    (2018-08-01)
    Pannil, Pittaya
    ;
    Pool-Em, Kittipat
    ;
    Trisuwannawat, Thanit
    ;
    Ukakimaparn, Prapart
    This paper aims to present a discrete-time controller design for a two-degree-of-freedom (2-DOF) control system connected with Posicast function to stabilize an unstable third-order or higher-order plant. The continuous-time controllers used in the 2-DOF control system, the proportional-integral-derivative (PID)×(n − 2) stage proportional-derivative (PD) cascade controllers and the forward controller, are designed by using the Kitti’s method. The Posicast function is used to eliminate an overshoot in step response. Based on the continuous-time controllers designed in the s-domain, the discrete-time controllers with closed-form expression in the z-domain are then calculated by using the bilinear transformation. The magnetic levitation system is employed as an illustrative case study of the unstable plant to be controlled. By comparing the discrete-time system with the continuous-time system, the effectiveness of the proposed discrete-time controller design is verified by MATLAB simulation results.
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    Design of discrete-time pida controller using kitti’s method with first-order hold discretization
    (2018-06-01)
    Pannil, Pittaya
    ;
    Sungsorn, Teenapong
    ;
    Trisuwannawat, Thanit
    ;
    Ukakimaparn, Prapart
    This paper proposes a successful technique to design a discrete-time (DT) proportional-integral-derivative-acceleration (PIDA) controller for third-order plants. The proposed technique consists of three major steps: discretization of the controlled plant using the first-order hold (FOH) method, discretization of the continuous-time (CT) PIDA controller structure using the delayed first-order hold (DFOH) method to achieve the DT PIDA controller structure, and design of the target controller using the Kitti’s method. Simulation results confirm that the controller designed by utilizing the proposed technique provides equivalent performances compared to a conventional CT controller and a DT controller discretized by utilizing the Tustin’s method.