Pannil, Pittaya

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Pannil, Pittaya
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Pannil, P.
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pittaya.pa@kmitl.ac.th

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    Item type:Publication,
    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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    Integral servo with PIDx(n-2)/2 stage PDA controllers for unstable systems
    (2009-12-01)
    Ukakimaparn, Prapart
    ;
    Pannil, Pittaya
    ;
    Irasesth, Kitti
    ;
    Trisuwannawat, Thanit
    This paper presents the Integral Servo Problem via PID x(n / 2)/2 stage PDAcontrollers for the Inverted Pendulum System as an unstable system to becontrolled. The problem is formulated by introducing an integrator to perform anaugmented system to the original plant. Once, the augmented system order isknown, the number of PDA's stage is also being determined. By using Kitti'sMethod (KM) to assign the location of both PID's zero first, and then find thelocation of the remaining zero of PDA and the loop gain KSd using the criteriaof Root-Locus Technique. The results from root locus diagrams revealed that theInverted Pendulum System is robustly stabilizable. Moreover, increasing of theloop gain KSd higher than the designed value, result in not only a fastersettling time is obtained, but also a response with smaller till no overshoot aswell. ICIC International © 2009.
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    Item type:Publication,
    Discrete-time integral servo with PID x (n-2)/2 stage PDA controllers for unstable systems
    (2010-12-01)
    Pannil, Pittaya
    ;
    Chotechuangchutchawal, Patsamol
    ;
    Trisuwannawat, Thanit
    This paper presents the simplest method to design the discrete-time integral servo problem employing PIDx(n-2)/2 stage PDA controllers for unstable systems. The results from simulation shown that even the discrete integrator is not introduced the unit impulse responses are easily satisfied differ from the case of continuous-time that necessary to be introduced. In addition, just increasing only the controller gain, the system is robustly stabilizable with the better performance. ©ICROS.