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Disturbance observer design for continuous systems with delay
Author(s) -
Jones R. W.,
Tham M. T.
Publication year - 2007
Publication title -
asia‐pacific journal of chemical engineering
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.348
H-Index - 35
eISSN - 1932-2143
pISSN - 1932-2135
DOI - 10.1002/apj.96
Subject(s) - control theory (sociology) , disturbance (geology) , observer (physics) , computer science , control engineering , engineering , geology , control (management) , physics , geomorphology , artificial intelligence , quantum mechanics
Disturbance observers (DOs), which are popularly used for improving the disturbance rejection capability of mechatronic servo control systems, offer several attractive features that could prove beneficial for process control systems. The tuning is simple and intuitive and they allow independent tuning of disturbance rejection characteristics, which is particularly helpful in situations in which gains need to be tuned on‐line. This paper is concerned with examining DO design for continuous‐time systems with delay. Two methods for incorporating time delay into traditional DO design are considered, to assess their relative performance, stability, and noise rejection characteristics. The performance of one of these time‐delay‐based DO approaches is then compared with proportional, integral and derivative (PID) control, designed using a maximum sensitivity approach, on a representative process model. The paper concludes by briefly examining the incorporation of a DO into a two‐degrees‐of‐freedom (2DOF) control structure. Copyright © 2007 Curtin University of Technology and John Wiley & Sons, Ltd.