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An alternative approach to anti‐windup in anticipation of actuator saturation
Author(s) -
Turner Matthew C.,
Sofrony Jorge,
Herrmann Guido
Publication year - 2016
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.3609
Subject(s) - control theory (sociology) , anticipation (artificial intelligence) , actuator , saturation (graph theory) , dead zone , representation (politics) , control (management) , computer science , control engineering , engineering , mathematics , law , artificial intelligence , combinatorics , oceanography , politics , political science , geology
Summary Traditionally, an anti‐windup compensator is activated when control signal saturation occurs. An alternative approach is to activate the compensator at a level below that of the physical control constraints: the anti‐windup compensator is activated in anticipation of actuator saturation. Recent studies have proposed systematic methods for the construction of such anticipatory anti‐windup compensators, but a pseudo‐LPV representation of the saturated system has been central to these results. This paper approaches the anticipatory anti‐windup problem for open‐loop stable plants using a ‘non‐square’ sector condition, which is associated with a combination of deadzone nonlinearities. The advantage of this approach is that it leads to synthesis routines, which bear a close resemblance to those associated with traditional immediately activated anti‐windup compensators. A by‐product of this approach also appears to be that the arising compensators are better numerically conditioned. Some simulation examples illustrating the effectiveness of anticipatory anti‐windup compensators and some comments on their wider use complete the paper. Copyright © 2016 John Wiley & Sons, Ltd.