PI and PID stabilization of neutral and retarded systems with time delay

Authors : Serdar Ethem HAMAMCI

Pages : 1189-1205

View : 19 | Download : 10

Publication Date : 0000-00-00

Article Type : Research Paper

Abstract :Stabilization using fixed-order controllers is one of the key topics in control system design for the linear time-invariant insert ignore into journalissuearticles values(LTI); systems. In this paper, the stabilization of LTI neutral and retarded time-delay systems by means of PI and PID controllers is investigated in detail. The basic theme of the presented approach is to obtain a global stability region in the 2-dimensional insert ignore into journalissuearticles values(2-D); insert ignore into journalissuearticles values(kp, ki);-plane for the PI controller and in the 3-dimensional insert ignore into journalissuearticles values(3-D); insert ignore into journalissuearticles values(kp, ki, kd);-space for the PID controllers. This region is formed by stability boundaries that are defined as the real root boundary, infinite root boundary, and complex root boundary. The 3-D global stability region for the PID case is made up of the set of 2-D stability regions that are obtained in the insert ignore into journalissuearticles values(kp, ki);-plane, insert ignore into journalissuearticles values(kp, kd);-plane, or insert ignore into journalissuearticles values(ki, kd);-plane by changing the other third parameter. To achieve this, the stability boundary locus approach is incorporated into the D-decomposition method. Thus, the complete set of stabilizing PI and PID controllers for the system is obtained. The simulation results indicate that the presented stabilization method is effective and practically useful in the analysis and control of the neutral and retarded time-delay systems.
Keywords : Neutral and retarded systems, state delay, stabilization, PI controllers, PID controllers