Robust PID×(n-2) stage PD cascade controller

Kitti, Tirasesth; Jongkol, Ngamwiwit; Prasit, Julsereewong; Thanit, Trisuwannawat; Michihiko, Iida

Robust PID×(n-2) stage PD cascade controller

Author(s)

Kitti, Tirasesth

Jongkol, Ngamwiwit

Prasit, Julsereewong

Thanit, Trisuwannawat

Michihiko, Iida

Date Issued

December 1, 1999

Type

Conference Paper

Abstract

This paper presents a design technique for the two degree of freedom (2-DOF) control system using PID (Proportional-Integral-Derivative)×(n-2) stage PD as a cascade controller for a class of n^th order plant. It is intended to satisfy both transient and steady state response specifications based on the root locus approach. This controller can be used instead of the conventional PID controller for the higher order plant to obtain better performance. The transfer function of a class of n^th order plant should not include zeros, the poles of the plant should have negative real part. The overall system is approximated as a stable and robust second order system. The performances of the controlled system are satisfied by this design technique. Moreover, this technique can also be applied to the plant with small dead time. The cascade controller gain can be adjusted to meet faster responses with a little or no overshoot. Robustness properties given by this controller proposed in this paper have also been demonstrated by numerical examples.

Citation

IEEE Conference on Control Applications Proceedings, 1, 109-114, 1999