Partial internal model control
Qing-Guo Wang
Qiang Bi
Yong Zhang
Dept. of Electr. Eng., Nat. Univ. of Singapore ;
This paper appears in: Industrial Electronics, IEEE Transactions on
Publication Date: Oct 2001
Volume: 48,
Issue: 5
On page(s): 976-982
ISSN: 0278-0046
References Cited: 18
CODEN: ITIED6
INSPEC Accession Number: 7070158
Digital Object Identifier: 10.1109/41.954562
Current Version Published: 2002-08-07
Abstract
Internal model control (IMC) is a well-known and effective control
scheme. However, when unstable processes are concerned, the original IMC
structure cannot be directly used for control system implementation. In
this paper, a new scheme called partial internal model control (PIMC) is
proposed, which is capable of controlling both stable and unstable
processes. In PIMC, a process model is expressed as the sum of the
stable and antistable parts and only the stable part of the process
model is used as the internal model. The process stable part is canceled
by the internal model and the remaining antistable part is stabilized
and controlled with a primary controller, which is usually a PID-type
regulator when the antistable part is of a low order. Various properties
of a PIMC system such as internal stability and robust stability are
analyzed. The design of PIMC is discussed in detail. Various simulation
examples are included for illustration and a real-time implementation on
a motor system is presented
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