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Design of a Disturbance Observer Using a Second-Order System Plus Dead Time Modeling Technique  

Jeong, Goo-Jong (명지대학교 전기공학과)
Son, Young-Ik (명지대학교 전기공학과)
Publication Information
The Transactions of The Korean Institute of Electrical Engineers / v.58, no.1, 2009 , pp. 187-192 More about this Journal
Abstract
This paper presents a method for designing a robust controller that alleviates disturbance effects and compensates performance degradation owing to the time-delay. Disturbance observer(DOB) approach as a tool of robust control has been widely employed in industry. However, since the Pade approximation of time-delay makes the plant non-minimum phase, the classical DOB cannot be applied directly to the system with time-delay. By using a new DOB structure for non-minimum phase systems together with the Smith Predictor, we propose a new controller for reducing the both effects of disturbance and time-delay. Moreover, the closed-loop system can be made robust against uncertain time-delay with the help of a Pill controller tuning method that is based on a second-order plus dead time modeling technique.
Keywords
Disturbance Observer; Smith Predictor; Non-minimum Phase; Time Delay; PID Control;
Citations & Related Records
Times Cited By KSCI : 6  (Citation Analysis)
Times Cited By SCOPUS : 0
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