Fault-tolerant control in presence of disturbances based on fault estimation

Stefanovski, Jovan; Juričić, Đani

doi:10.1016/j.sysconle.2020.104646

Cited by 11 publications

(14 citation statements)

References 24 publications

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“…For a review of literature on the controllers satisfying Assumption 1, see Section 2.1 in Reference 14. Note that the nominal controller in this article is allowed to be improper and unstable.…”

Section: Preliminariesmentioning

confidence: 99%

“…FTC controllers for general additive faults are presented in the following literature. The feedback controller in Theorem 1 of Reference 14 (see also the motivating Example 1 (iv) in Reference 15) does not need any assumption on the fault. However, a required condition is the stability of the nominal controller.…”

Section: Introductionmentioning

confidence: 99%

“…The motivations of this article are related to the mentioned drawbacks of References 2 and 14 . A motivation is to modify the tracking schemes given in figs.…”

Section: Introductionmentioning

confidence: 99%

“…6 and 10 of Reference 2, which gives a solution of the FTT problem. A motivation, related to Reference 14 is to modify the control scheme in fig. 2 of Reference 14 so that the poles of the nominal controller can be elsewhere in the complex half‐plane (not only in

ℜ [s] < 0

).…”

Section: Introductionmentioning

confidence: 99%

“…The mentioned improvements of results in References 2 and 14 are made possible by presenting at first a formal definition of the FTT problem, see Problem 1.…”

Section: Introductionmentioning

confidence: 99%

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Novel controller design for fault tolerant tracking with general additive faults and disturbances

Stefanovski

2021

Intl J Robust & Nonlinear

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A formulation of the problem of fault tolerant tracking (FTT) in presence of general additive faults and disturbances is given. It is proved that a necessary condition for the FTT problem is that the plant is minimum‐phase. Then the problem is solved for the minimum‐phase descriptor systems, but possibly with zeros at infinity. The proposed overall controller consists of a feedback controller, which is stabilizing, and a feedforward controller, whose role is to achieve the tracking of an arbitrary reference signal by the controlled output. The feedback controller consists of a possibly unstable, improper and non‐minimum‐phase nominal controller, a fault estimator, and a fault compensator. The role of the nominal controller is to achieve a nominal tracking behavior in absence of faults. The role of the fault compensator is to achieve a nominal tracking behavior in presence of faults, in case that the fault estimation is accurate. However, the fault estimation need not to be accurate, if a design parameter, depending on the nominal controller, can be chosen small. Illustrative examples are given.

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Section: Preliminariesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

“…The motivations of this article are related to the mentioned drawbacks of References 2 and 14 . A motivation is to modify the tracking schemes given in figs.…”

Section: Introductionmentioning

confidence: 99%

ℜ [s] < 0

).…”

Section: Introductionmentioning

confidence: 99%

“…The mentioned improvements of results in References 2 and 14 are made possible by presenting at first a formal definition of the FTT problem, see Problem 1.…”

Section: Introductionmentioning

confidence: 99%

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Novel controller design for fault tolerant tracking with general additive faults and disturbances

Stefanovski

2021

Intl J Robust & Nonlinear

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Passivity‐based adaptive fault‐tolerant control for continuous‐time Markov jump PWA systems with actuator faults

Zhu

Chen

et al. 2021

Intl J Robust & Nonlinear

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In this article, the issue of passivity‐based adaptive fault‐tolerant piecewise linear (FT‐PWL) control is investigated for a class of continuous‐time Markov jump nonlinear systems with actuator faults. The nonlinear space is divided into a series of subspaces and approximated by piecewise‐affine (PWA) regions, such that the corresponding systems are transformed into a class of continuous‐time Markov jump PWA systems. First, the switching paths between different PWA subsystems or different PWA regions within certain subsystem are optimized via a new optimal region switching paths (ORSPs) algorithm. This algorithm optimizes the loop way of searching the switching path and also reduces the number of redundant loops. Second, based on the proposed ORSPs algorithm, a novel adaptive FT‐PWL controller is designed to ensure the stochastic stability and passivity of the corresponding closed‐loop system. The unknown variations of actuator fault parameters are compensated via an adaptive FT mechanism. Finally, one numerical example is illustrated to show the validity and effectiveness of both developed ORSPs algorithm and proposed adaptive FT‐PWL control mechanism.

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Fault Diagnosis/Fault-Tolerant Control: A Survey of Results for Linear Systems Over Frequency Region in Presence of Disturbances

Stefanovski

2022

Studies in Systems, Decision and Control

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Fault-tolerant control in presence of disturbances based on fault estimation

Cited by 11 publications

References 24 publications

Novel controller design for fault tolerant tracking with general additive faults and disturbances

Novel controller design for fault tolerant tracking with general additive faults and disturbances

Passivity‐based adaptive fault‐tolerant control for continuous‐time Markov jump PWA systems with actuator faults

Fault Diagnosis/Fault-Tolerant Control: A Survey of Results for Linear Systems Over Frequency Region in Presence of Disturbances

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