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New filters for internal model control design
Author(s) -
Campi Marco,
Lee Wee Sit,
Anderson Brian D. O.
Publication year - 1994
Publication title -
international journal of robust and nonlinear control
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.361
H-Index - 106
eISSN - 1099-1239
pISSN - 1049-8923
DOI - 10.1002/rnc.4590040605
Subject(s) - control theory (sociology) , internal model , overshoot (microwave communication) , robustness (evolution) , filter design , bandwidth (computing) , filter (signal processing) , frequency response , low pass filter , computer science , step response , control engineering , engineering , control (management) , telecommunications , biochemistry , chemistry , artificial intelligence , electrical engineering , computer vision , gene
In this paper we study the design of a new two‐degree‐of‐freedom filter for the internal model control (IMC) method. The new filter alleviates some disadvantages of the standard IMC filter when the IMC method is applied to unstable plants that do not have non‐minimum‐phase zeros. We show that by employing the new filter, the resulting system has a flatter frequency response, better stability robustness, and little overshoot in the step response. Furthermore, one of its design parameters can be related directly to the closed‐loop bandwidth and the other parameter can be used to control the recovery time after an overshoot has occurred in the step response. These features are important in the application of the IMC method to a new approach of adaptive robust control. Examples are given in the paper to illustrate the new filter design.