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Disturbance Rejection: A Main Concern in Process Control

Time: 2:00 – 4:00 p.m., April 22, 2016

Classroom: Lecture Room 304, Institute of Cyber-Systems & Control, Zhejiang University

Contact: Dr. Chao Xu, Email: cxu@zju.edu.cn; WeChat: 53295319 

Pedro Albertos, past president of IFAC (the International Federation of Automatic Control) in 1999-2002, IFAC Fellow and Advisor, and Senior Member of IEEE, is a world recognized expert in real-time control, leading several projects in the field. Full Professor since 1975, he is currently Emeritus Professor at Systems Engineering and Control Dept. UPV, Spain. He is Doctor Honoris-Causa from Oulu University (Finland) and Bucharest Polytechnic (Rumania) and Honorary Professor from the Northeastern University, Shenyang, RPC.

Abstract – The central problems in process control are related to reference tracking and disturbance rejection. In this series of seminars we are going to deal with the problem of disturbance treatment.

Different types of disturbances can be considered and also different approaches will be outlined to reject or reduce their effects. The disturbances could be external or generated by model uncertainties. They can be measured or estimated.

The most popular controller design methodologies to deal with disturbances will be reviewed. Disturbance Observers (DOB), Uncertainty and Disturbance Estimator (UDE) and Active Disturbance Rejection Control (ADRC) approaches will be presented and their advantages and limitations when dealing with either non-minimum phase, unstable or nonlinear plants will be discussed. Also, the presence of time delays should be considered. The main issues involved in each approach are illustrated by different applications. Some conclusions and comparisons are drafted and some open problems are presented.

Special attention will be paid to ADRC: its main components, the control properties and applications.