A Nonlinear PD Controller Design and Its Application to MOV Actuators

Yungdeug SON¹, Gang-Gyoo JIN^2*
¹ Department of Mechanical Facility Control Engineering, Korea University of Technology and Education,
1600 Chungjeol-ro, Dongnam-gu, Cheonan, Chungnam, 31253, Korea
ydson@koreatech.ac.kr
² Division of Control and Automation Engineering, Korea Maritime and Ocean University,
727 Taejong-ro, Yeongdo-gu, Busan, 49112, Korea
ggjin@kmou.ac.kr (^*Corresponding author)

ABSTRACT: This paper proposes a novel design method to control the opening and closing of a valve connected with a motoroperated valve actuator. In the structure of the proposed controller, a nonlinear gain is connected in series with the linear proportional-derivative controller with a first-order filter in the denominator. The nonlinear gain is described by a simple function of the error between the set-point and the measured output. The controller parameters are optimally tuned using a genetic algorithm (GA) so that a given objective function can be minimized. The stability of the closed-loop system is assessed using the Popov stability criterion. Simulation works are done to validate the effectiveness of the proposed method.

KEYWORDS: MOV actuator, Nonlinear PD controller, Nonlinear function, Popov criterion.

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CITE THIS PAPER AS:
Yungdeug SON, Gang-Gyoo JIN, A Nonlinear PD Controller Design and Its Application to MOV Actuators, Studies in Informatics and Control, ISSN 1220-1766, vol. 28(1), pp. 5-12, 2019. https://doi.org/10.24846/v28i1y201901