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Adaptive rejection of periodic disturbances with unknown period

Hillerström, Gunnar (author)
Sternby, Jan (author)
Luleå tekniska universitet,Signaler och system
 (creator_code:org_t)
1996-09-01
1996
English.
In: Journal of Dynamic Systems Measurement, and Control. - : ASME International. - 0022-0434 .- 1528-9028. ; 118:3, s. 606-610
  • Journal article (peer-reviewed)
Abstract Subject headings
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  • A disturbance cancellation extension by means of Youla parametrization to a stabilizing nominal controller is investigated. In the case of known disturbance model, disturbance frequencies or period time, it may be implemented directly as an add-on device to the existing control system. The nominal control system may be designed without consideration of the deterministic disturbances. This way it may suffice with a PID controller. It may also be a more complex one e.g., designed to obtain certain robustness properties. For known relation between the disturbance frequencies (one or more periodic signals) but unknown fundamental frequency, a frequency shaped disturbance model estimarion scheme is utilized. This makes it possible to e.g., adapt the disturbance model to minimize the error directly with respect to the output. For periodic disturbances the scheme implements a self-tuning discrete time repetitive controller. To illustrate the feasibility of the approach taken it is used for rejecting a periodic disturbance acting on a nonminimum-phase plant.

Subject headings

TEKNIK OCH TEKNOLOGIER  -- Elektroteknik och elektronik -- Reglerteknik (hsv//swe)
ENGINEERING AND TECHNOLOGY  -- Electrical Engineering, Electronic Engineering, Information Engineering -- Control Engineering (hsv//eng)

Keyword

Reglerteknik
Control Engineering

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Sternby, Jan
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Luleå University of Technology

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