Full order observer design for linear systems with unknown inputs

Sfaihi, Boutheina; Boubaker, Olfa

doi:10.1109/icit.2004.1490737

Cited by 7 publications

(8 citation statements)

References 10 publications

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“…The stator and rotor voltages S U and R U as well as the currents S I and R I are space vectors with real and imaginary parts. The state space model of the electrical system is shown in equation (1) where stator and rotor currents form the state vector x. Rotor voltage is the known input vector u and stator voltage is the unknown input vector v, as shown in equation (2). The resulting system matrix A is shown in equation (3).…”

Section: System Modelmentioning

confidence: 99%

“…Moreover to reconstruct the unknown inputs, as it is extended here, the measured outputs of the system and the known inputs are needed. Using the estimated states and the known inputs, the unknown inputs are reconstructed [2]. The block diagram of a UIO with reconstruction of the unknown inputs is given in figure 3.…”

Section: Unknown Input Observermentioning

confidence: 99%

“…The measurement results of the observers are compared to each other and to the results of an inverse model of the DFIG. While unknown input observers are usually used for state reconstruction with unknown inputs, they may also be used for input reconstruction [2], what is done here. Unknown input observers are described by [2], [3], [4], [5] and [6].…”

Section: Introductionmentioning

confidence: 99%

“…While unknown input observers are usually used for state reconstruction with unknown inputs, they may also be used for input reconstruction [2], what is done here. Unknown input observers are described by [2], [3], [4], [5] and [6]. Most publications treat unknown input observers theoretically without an implementation on an electrical system.…”

Section: Introductionmentioning

confidence: 99%

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Analysis of stator voltage observers for a doubly fed induction generator

Thomsen

Rothenhagen

Fuchs

2007

2007 European Conference on Power Electronics and Applications

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Observers for the stator voltage estimation of a Doubly Fed Induction Generator (DFIG) are described and investigated in this analysis. These are the Disturbance Observer (DO) and the Unknown Input Observer (UIO) with input reconstruction. They are analysed by simulations and laboratory experiments in two different reference frames. Both observers are extended to observe a bilinear system. A pseudo synchronised reference frame is proposed to improve performance. The results of the observers are compared to the results of an inverse model of the DFIG. It can be stated, that the stator voltage is well observed.

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Section: System Modelmentioning

confidence: 99%

Section: Unknown Input Observermentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Analysis of stator voltage observers for a doubly fed induction generator

Thomsen

Rothenhagen

Fuchs

2007

2007 European Conference on Power Electronics and Applications

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“…On the other hand, following the Darouach and Zasadzinsk works [36,37,38] we can state the following:…”

Section: Proofmentioning

confidence: 99%

Full Order Unknown Inputs Observer for Multiple Time-Delay Systems

Warrad

Boubaker

2016

International Journal on Smart Sensing and Intelligent Systems

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Abstract-In this paper, a design of a full-order observer for linear time-invariant (LTI)multivariable systems with multiple time-delays and unknown inputs (UI) is proposed. The main idea is to reduce the problem of the unknown input observer (UIO) for systems with multiple time-delays to that of a standard one. To that purpose, the orthogonal collocation method is used to transform the infinite dimensional model of the delayed system described by a set of linear partial differential equations (PDEs) to a finite dimensional one described by a set of linear ordinary differential equations (ODEs). Even using an approximation method, the asymptotic stability of the UIO is well proven. The efficiency of the proposed algorithm is shown using the quadruple-tank benchmark. The two cases of minimum and non-minimum phase models are considered.

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