Reduced-Order Unknown-Input Perfect Observer for Standard Systems

Krzemiński, S.; Kaczorek, Tadeusz

doi:10.3182/20050703-6-cz-1902.00210

Cited by 3 publications

(4 citation statements)

References 13 publications

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“…One possible method uses an unknown input state observer [35]- [37], [40]. This type of observer is decoupled from specified inputs-in this case, the unknown stator voltage.…”

Section: Design Of Voltage Observermentioning

confidence: 99%

Doubly Fed Induction Generator Model-Based Sensor Fault Detection and Control Loop Reconfiguration

Rothenhagen

Fuchs

2009

IEEE Trans. Ind. Electron.

145

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Fault tolerance is gaining interest as a means to increase the reliability and availability of distributed energy systems. In this paper, a voltage-oriented doubly fed induction generator, which is often used in wind turbines, is examined. Furthermore, current, voltage, and position sensor fault detection, isolation, and reconfiguration are presented. Machine operation is not interrupted. A bank of observers provides residuals for fault detection and replacement signals for the reconfiguration. Control is temporarily switched from closed loop into open-loop to decouple the drive from faulty sensor readings. During a short period of open-loop operation, the fault is isolated using parity equations. Replacement signals from observers are used to reconfigure the drive and reenter closed-loop control. There are no large transients in the current. Measurement results and stability analysis show good results.

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“…One possible method uses an unknown input state observer [35]- [37], [40]. This type of observer is decoupled from specified inputs-in this case, the unknown stator voltage.…”

Section: Design Of Voltage Observermentioning

confidence: 99%

Doubly Fed Induction Generator Model-Based Sensor Fault Detection and Control Loop Reconfiguration

Rothenhagen

Fuchs

2009

IEEE Trans. Ind. Electron.

145

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“…if only one of the state variables is measured, an UIO with arbitrary poles cannot be designed (see [20][21]). To design a stable UIO [21] the second of the state variables should be measured.…”

Section: Algorithmmentioning

confidence: 99%

A three term controller for ride comfort improvement

Koumboulis¹,

Kouvakas²

2011

2011 19th Mediterranean Conference on Control &Amp; Automation (MED)

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For a quarter car model, a PID controller that provides ride comfort is developed. The PID controller parameters are derived using a metaheuristic algorithm. The performance of the proposed control scheme and its robustness with respect to uncertainties of the model parameters are examined through computational experiments. The proposed control scheme has satisfactory performance and feeds back only one measurable variable thus providing a simple and cheap solution.

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“…The resulting system matrix A is shown in equation (3). Matrix B represents the input matrix of the known inputs u, matrix D represents the input matrix of the unknown inputs v, and C is the output matrix of the system model, as can be seen in equation (4). Only stator voltage observation is considered in this analysis.…”

Section: System Modelmentioning

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%

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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Reduced-Order Unknown-Input Perfect Observer for Standard Systems

Cited by 3 publications

References 13 publications

Doubly Fed Induction Generator Model-Based Sensor Fault Detection and Control Loop Reconfiguration

Doubly Fed Induction Generator Model-Based Sensor Fault Detection and Control Loop Reconfiguration

A three term controller for ride comfort improvement

Analysis of stator voltage observers for a doubly fed induction generator

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