H&lt;sub&gt;&amp;#x0221E;&lt;/sub&gt; observer for time-delay systems Application to FDI for irrigation canals

Bedjaoui, Nadia; Litrico, Xavier; Koenig, Damien; Malaterre, Pierre‐Olivier

doi:10.1109/cdc.2006.377709

Cited by 8 publications

(7 citation statements)

References 7 publications

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“…Remark 5: In [31], fault detection and isolation problem for time-delay fractional systems of order in (0, 1) with constant time-delay is considered, so the approach therein can't be applied to system (1). The work of Bedjaoui et al [32] investigated the fault detection and isolation problem for a specific irrigation canals model using an H ∞ and unknown input observer designing for systems with multiple time-varying state delays and unknown input delays, which can also be investigated using the proposed approach in this paper by appropriate modification. In [32], all the lower bounds of those time-delays are all restricted to 0.…”

Section: Residual Generators For Fault Isolationmentioning

confidence: 99%

“…There have been many FDI schemes based on reduced-order state observers including functional observers as such residual generators have lower dynamical order and thus are easier to implement [25]- [29]. It should be noted that nearly all the existing residual generators are constructed for delay-free systems, and very little work [30]- [32] has been reported on FDI for time-delayed systems. When the system is subject to time-delay, it will be more complicated and challenging for stability analysis and control design including fault diagnosis problems, and extra effort should be made to deal with time-delay issue.…”

Section: Introductionmentioning

confidence: 99%

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Functional Observer Design for Time-Delayed Systems With Application to Fault Diagnosis

2019

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This paper deals with the functional observer (FO)-based fault detection and isolation problem for time-delayed linear systems. First, a new method to design the low-order FO estimating the partial states for linear systems with time-varying delay is presented. Conditions for the existence of the proposed observer and the stability of resulting error dynamics are derived. Based on the proposed observer, a novel residual generator is constructed to detect actuator faults. Furthermore, a bank of residual generators for fault isolation is also constructed for time-delayed systems. The simulation results of the numerical example demonstrate that the proposed observer-based fault diagnosis scheme works effectively.

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Section: Residual Generators For Fault Isolationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Functional Observer Design for Time-Delayed Systems With Application to Fault Diagnosis

2019

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“…In [35], this methodology is applied for the estimation of the state-of-charge of batteries. Observer designs for time-delay systems with unknown inputs are presented in [2], [5], [23]. Swapping identifiers, originally developed for parameter estimation of ODE systems [21], [24], are constructed for parabolic PDEs in [43], [45], [46], [47].…”

Section: Literaturementioning

confidence: 99%

Modeling and Estimation of the Humans' Effect on the CO<sub>2</sub> Dynamics Inside a Conference Room

Weekly

Bekiaris-Liberis

Jin

et al. 2015

IEEE Trans. Contr. Syst. Technol.

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We develop a data driven, partial differential equation-ordinary differential equation model that describes the response of the carbon dioxide (CO 2 ) dynamics inside a conference room, due to the presence of humans, or of a user-controlled exogenous source of CO 2 . We conduct three controlled experiments to develop and tune a model whose output matches the measured output concentration of CO 2 inside the room, when known inputs are applied to the model. In the first experiment, a controlled amount of CO 2 gas is released inside the room from a regulated supply, and in the second and third experiments, a known number of humans produce a certain amount of CO 2 inside the room. For the estimation of the exogenous inputs, we design an observer, based on our model, using measurements of CO 2 concentrations at two locations inside the room. We perform several simulation studies for the illustration of our results.Index Terms-Data-driven model, distributed delay, distributed parameter systems, human occupancy estimation, identifier design, indoor carbon dioxide (CO 2 ) dynamics, observer design, partial differential equation-ordinary differential equation (PDE-ODE) cascades.

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“…This paper [11] uses unknown input observers (UIO) for time-delay systems (e.g., [12] and [13]) to design a FDI scheme for a single canal reach. This approach was extended to multiple pools when only downstream levels are measured in [23].…”

Section: Introductionmentioning

confidence: 99%

Cyber Security of Water SCADA Systems—Part II: Attack Detection Using Enhanced Hydrodynamic Models

Amin

Litrico

Sastry

et al. 2013

IEEE Trans. Contr. Syst. Technol.

141

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This paper investigates the problem of detection and isolation of attacks on a water distribution network comprised of cascaded canal pools. The proposed approach employs a bank of delay-differential observer systems. The observers are based on an analytically approximate model of canal hydrodynamics. Each observer is insensitive to one fault/attack mode and sensitive to other modes. The design of the observers is achieved by using a delay-dependent linear matrix inequality method. The performance of our model-based diagnostic scheme is tested on a class of adversarial scenarios based on a generalized fault/attack model. This model represents both classical sensor-actuator faults and communication network-induced deception attacks. Our particular focus is on stealthy deception attacks in which the attacker's goal is to pilfer water through canal offtakes. Our analysis reveals the benefits of accurate hydrodynamic models in detecting physical faults and cyber attacks to automated canal systems. We also comment on the criticality of sensor measurements for the purpose of detection. Finally, we discuss the knowledge and effort required for a successful deception attack.Index Terms-Delay systems, fault diagnosis, intrusion detection, supervisory control and data acquisition (SCADA) systems, supervisory control.

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H<sub>∞</sub> observer for time-delay systems Application to FDI for irrigation canals

Cited by 8 publications

References 7 publications

Functional Observer Design for Time-Delayed Systems With Application to Fault Diagnosis

Functional Observer Design for Time-Delayed Systems With Application to Fault Diagnosis

Modeling and Estimation of the Humans' Effect on the CO<sub>2</sub> Dynamics Inside a Conference Room

Cyber Security of Water SCADA Systems—Part II: Attack Detection Using Enhanced Hydrodynamic Models

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