A Generalized Observer for Estimating Fast–Varying Disturbances

Duc, Ton

doi:10.1109/access.2018.2833430

Cited by 24 publications

(36 citation statements)

References 48 publications

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“…Besides, regarding technical factors, it is obvious that the sensors may be sensitive with noise that leads to the measurement errors; thus, replacing the sensors by the observer means increasing the reliable for obtaining the information of states. It is seen that, with the novel polynomial observer form (19), the constraints of aerodynamic torque such as the first derivative to be equal to zero or the r th time derivative to be bounded are unnecessary in this study. It means that the proposed method is more relaxed and applicable in practice with respect to the methods in previous papers The model errors may come from the linearization process and parameter errors.…”

Section: Resultsmentioning

confidence: 99%

“…It is seen that, with the novel polynomial observer form (19), the constraints of aerodynamic torque such as the first derivative to be equal to zero or the r th time derivative to be bounded are unnecessary in this study. It means that the proposed method is more relaxed and applicable in practice with respect to the methods in previous papers …”

Section: Resultsmentioning

confidence: 99%

“…Suppose that we need to track the optimal power for WCSs . In this study, we assume that Only ω is measurable; i d and i q (hence T e ) are unknown state variables. Wind speed v and aerodynamic torque T a are unknown and arbitrary. Because, the information of i d , T e , and T a are not available, the recent methods are failed to design a controller for tracking the optimal power. In addition, because the aerodynamic torque T a is arbitrary, therefore, it maybe does not fulfill the constraints, which make the proposed methods in these studies unable to apply for this case.…”

Section: System Description and Problem Statementmentioning

confidence: 99%

“…It is due to their endlessness and cleanness. In WECSs, wind speed is key information to be known in real time . Unfortunately, it is not easy to measure it with enough precision for control systems.…”

Section: Introductionmentioning

confidence: 99%

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A novel nonlinear observer‐based LQ control system design for wind energy conversion systems with single measurement

Duc

2019

Wind Energy

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The issue of tracking the optimal power for wind energy conversion systems (WECSs) via regulating the rotor speed of the generator is taken into account in this study. Additionally, a novel polynomial observer is proposed for estimating not only aerodynamic torque in WECSs but also d‐axis and electromagnetic torque. Therefore, in this new approach, only the rotor speed of the generator is required to be measured instead of measuring all state variables. With the new observer form, the aerodynamic torque does not need to satisfy any constraints, which are mandatory in the previous methods. It should be noted that this methodology has not been investigated for the WECSs in any previous papers. To design a complete control system, a linear optimal control method cooperated with the polynomial observer is employed to track the optimal trajectory of a generator. Moreover, in this paper, the permanent magnet synchronous generator is used. In addition, on the basis of the Lyapunov theory and sum‐of‐square (SOS) technique, the conditions for observer synthesis are derived in the main theorems. Finally, the simulation results are provided to prove the effectiveness and merit of the proposed method.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: System Description and Problem Statementmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

A novel nonlinear observer‐based LQ control system design for wind energy conversion systems with single measurement

Duc

2019

Wind Energy

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“…In general, the performance of WECS is affected by lumped disturbances, including internal disturbances, ie, parameter variations, control couplings, modelling errors, and nonlinear dynamics of the plant as well as external disturbances which mainly come from wind gusting, torsional vibration, wind stream dissymmetry, etc . One solution to eliminate effect of instability in reaching phase is the integral sliding mode control (ISMC) approach . In ISMC, the trajectory of the system states immediately starts from the defined sliding surface.…”

Section: Introductionmentioning

confidence: 99%

Disturbance observer‐based integral sliding mode control for wind energy conversion systems

et al. 2020

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Recently, wind power production has been under the focus in generating power and became one of the main sources of alternative energy. Generating of maximum power from wind energy conversion system (WECS) requires accurate estimation of aerodynamic torque and uncertainties presented in the system. The current paper proposed the generalized high‐order disturbance observer (GHODO) with integral sliding mode control (ISMC) for extraction of maximum power via variable speed wind turbine by accurate estimation of wind speed. The assumption in previous works that considers the aerodynamic torque as slow‐varying is not applicable for the real system. Therefore, the high‐order disturbance observers were designed for precise estimation of uncertainties with fast‐changing behavior. A robust control system was designed to control the speed of the rotor at the optimal speed ratio. The obtained simulation results have shown the better performance characteristics than conventional linear quadratic regulator (LQR) approach. The stability of the proposed algorithm was proven by Lyapunov stability anaysis. Simulations results were obtained in Matlab/Simulink environment.

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Model‐free finite‐time terminal sliding mode control with a novel adaptive sliding mode observer of uncertain robot systems

Song

Fang

Wang

2021

Asian Journal of Control

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This paper presents a model-free finite-time terminal sliding mode control scheme of uncertain robot systems. Time delay estimation (TDE) technique is employed to estimate mathematical model of system. However, TDE cannot achieve satisfactory performance when the system suffers from impactive disturbances. For this reason, a novel adaptive sliding mode observer is designed to compensate estimation errors. Moreover, the proposed observer is finite-time stable and the design process does not depend on the upper bounds of uncertainties and its derivatives, and it can be also extended to other nonlinear systems with external disturbance. A nonsingular fast terminal sliding surface is designed to accelerate convergence rate and boundary layer technique is adopted to attenuate the chattering phenomenon. Finally, a finite-time stable controller is constructed to stabilize the closed-loop system. The proposed controller is model-free and can be easily implemented in practice. The stability of both observer and controller is strictly proven in the Lyapunov framework. Simulations and experimental studies using Rethink Sawyer Robot are carried out to verify the effectiveness of the proposed scheme.

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A Generalized Observer for Estimating Fast–Varying Disturbances

Cited by 24 publications

References 48 publications

A novel nonlinear observer‐based LQ control system design for wind energy conversion systems with single measurement

A novel nonlinear observer‐based LQ control system design for wind energy conversion systems with single measurement

Disturbance observer‐based integral sliding mode control for wind energy conversion systems

Model‐free finite‐time terminal sliding mode control with a novel adaptive sliding mode observer of uncertain robot systems

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