Realisation of two-degrees-of-freedom compensators

Vilanova, Ramón; Serra, I.

doi:10.1049/ip-cta:19971617

Cited by 28 publications

(14 citation statements)

References 3 publications

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“…The control topology will be a TwoDegree-of-Freedom (2-DOF) controller. This kind of controllers has been broadly studied in the control literature due to their capacity to simultaneously achieve acceptable tracking and disturbance rejection, [28]. A basic 2-DOF control scheme appropriate for inverse model control is depicted in Fig.…”

Section: Problem Formulationmentioning

confidence: 99%

Digital inverse model control using Generalised holds with extensions to the adaptive case

Ibeas

Sen

Balaguer

et al. 2010

Int. J. Control Autom. Syst.

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In this paper, a digital implementation of an inverse-model based control scheme is proposed using Generalised Sampling and Hold Functions. The implementation of the controller using this kind of holds allows overcoming the difficulties related to the presence of unstable zeros in the continuous-time model and the usual appearance of unstable discretisation zeros in the discrete model when a ZOH is applied. The Generalised Sampling and Hold Functions allows obtaining a discrete model of the plant with all its zeros stable which allows realizing an exact inverse model of the plant in comparison to the use of a classical ZOH which only allows, in general, an approximate inversion of the plant. The proposed approach is then extended to the adaptive case where the stability and tracking properties of the general scheme are fully proved. Simulation examples showing the scope and application of the method are also presented.

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Section: Problem Formulationmentioning

confidence: 99%

Digital inverse model control using Generalised holds with extensions to the adaptive case

Ibeas

Sen

Balaguer

et al. 2010

Int. J. Control Autom. Syst.

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“…Indeed, the stability of the closed-loop is proved under weak feasible conditions on the parameter evolution. This benefit is obtained by using a certain implementation of a 2-DOF control law introduced in [16,17]. In this way, stability is mainly guaranteed by an internal fixed feedback controller while the tracking performance is achieved by genetically modified external compensators.…”

Section: In This Paper a Two Degree Of Freedom (2-dof) Approach To Imentioning

confidence: 99%

“…In this section we concentrate on the basic 2-DOF control law implementation introduced in [16,17] and displayed in There are several implementations of the general two degree of freedom controller. However, as pointed out in [19], not all of them possess the same closed-loop properties.…”

Section: Two Degree Of Freedom (2-dof) Control Law Implementationmentioning

confidence: 99%

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Stable Genetic Adaptive Control by Using a 2-DOF Control Scheme

Ibeas

2008

TOCSJ

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This paper introduces an adaptive controller based on the online genetic estimation of the parameters of the system. The main novelty of the paper relies on the fact that the stability of the genetic adaptive scheme is fully tackled proving the boundedness of all systems signals under weak conditions on the genetic population evolution. Thus, the proposed set-up is flexible enough to be integrated within a great variety of genetic estimation algorithms. The goal is achieved by using a certain Two-Degree-of-Freedom (2-DOF) based implementation of the control law. The procedure for the genetic controller synthesis is described while its properties and requirements are stated.

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“…As it is pointed out in (Vilanova & Serra, 1997), classical control approaches tend to stress the use of feedback to modify the systems' response to commands. A clear example, widely used in the literature of linear control, is the usage of reference models to specify the desired properties of the overall controlled system (Astrom & Wittenmark, 1984).…”

Section: Introductionmentioning

confidence: 99%