Design of PD controllers for systems with high time delay

Abstract

PID controllers are the most used controllers in industry, with a share of 95% of all used controllers. Most of them are PI controllers, while PD controllers are less common. This paper proposes the design of PID controllers by D–decomposition method, as well as application of this type of controllers to the delay systems. The results presented in this paper show that PD controller, obtained by the proposed method, gives good results, and that differential action minimizes effects of time delay and achieves stability of systems with high time delay.