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共 63 条记录，以下是31-40 订阅

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A Luenberger state observer for simultaneous estimation of speed and stator resistance in sensorless IRFOC induction motor drives

A Luenberger state observer for simultaneous estimation of s...

引用

International Conference on sciences and techniques of automatic control and computer engineering (sta)

作者： M. Jouili Y. Agrebi Y. Koubaa M. Boussak Laboratory of Sciences and Techniques of Automatic control & computer engineering (Lab-STA) University of Sfax Sfax Tunisia UMR CNRS 7296 Ecole Centrale Marseille (ECM) France

ISBN: (纸本)9781467392358

This paper characterizes the problem of implementing a simultaneous estimation of the stator resistance and the rotor speed of a sensorless indirect rotor flux oriented control (IRFOC) induction motor (IM) drive. For this purpose, the Luenberger state observer (LSO) is taken as a rudimentary method to simultaneously estimate the rotor speed and the stator resistance. Likewise, we suggest an adaptation algorithm related to the Lyapunov stability hypothesis to estimate the stator resistance and the rotor speed. The latter utilizes the estimated and measured stator currents and the estimated rotor flux. Along these lines, the control method that we suggest is liable to achieve a good performance after reducing the computational complexity through the use of the analytical relation in order to determine the Luenberger observer (LO) gain matrix. Additionally, compared to the previous observers, our observer is characterized by its simplicity, robustness as well as its ability to be implemented online. This article implies also the use of a typical PI regulator with feed-forward reparation expressions in the synchronous frame. But to regulate the rotor speed, we use the IP controller because of its effectiveness. Actually, its validity and efficiency are verified by the simulation results.

关键词： Rotors Observers Resistance stator windings Zirconium

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Fuzzy Network-based control for nonlinear systems with limited communication

Fuzzy Network-based control for nonlinear systems with limit...

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International Conference on Systems, Analysis and automatic control

作者： Mourad Kchaou Ahmed Toumi Laboratory of Sciences and Techniques of Automatic control & computer engineering (Lab-STA) High Institute op Applied Sciences and Technology Sousse ISSATso University of Sfax National School of Engineers of Sfax

ISBN: (纸本)9781467364591

This paper is concerned with the problem of stabilization of continuous-time Takagi-Sugeno (TS) fuzzy systems which are controlled through networks. Network-induced delays, data packet dropouts, and measurement quantization are simultaneously considered for Network signal-transmission. Based on the LyapunovKrasovskii functional approach and a parallel distributed compensation scheme, a delay-dependent stabilization approach is developed for the NCSs, which guarantees that the closed-loop system is asymptotically stable. Finally, an illustrative example is given to illustrate the effectiveness of the proposed design technique.

关键词： Nonlinear systems design techniques Closed loop systems data packets Fuzzy Communication Research dropouts Student Dropouts standing Orders Fuzzy systems

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Design of robust adaptive observer for nonlinear TS fuzzy system with unknown inputs

Design of robust adaptive observer for nonlinear TS fuzzy sy...

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International Conference on sciences and techniques of automatic control and computer engineering (sta)

作者： M. Bahloul M. Souissi M. Chaabane L. Chrifi-Alaoui Laboratory of Sciences ana Techniques of Automatic Control and Computer Engineering (Lab-STA) University of Sfax Sfax Tunisia Laboratory of Innovative Tecbnology (LTI) University of Pi-caraie Cuffies France

This paper deals with robust estimation of states and unknown inputs for a class of non linear system described by Takagi-Sugeno fuzzy models. The proposed approach is developed on the basis of adaptive Luenberger observer theory. A robustness study, using the L 2 technique, is carried out to take in consideration the model uncertainties. Unknown inputs estimation is ensured through a fuzzy proportional integral adaptive law, computed from an accurate observer outputs which allow a fast dynamic estimation. Design conditions are formulated into Linear Matrix Inequalities (LMIs) terms. Numerical example is given to illustrate the efficiency of the proposed techniques.

关键词： Robustness Adaptation models computers Linear matrix inequalities Indexes Observers

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Design verification based on Hardware-In-the-Loop simulation for photovoltaic system

Design verification based on Hardware-In-the-Loop simulation...

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IEEE SSD International Multi-Conference on Systems, Signals and Devices

作者： Hanen Abbes Mossaad Ben Ayed Hafedh Abid Mohamed Abid Department of Electrical Engineering University of Sfax Sfax Tunisia Department of Electrical Engineering Laboratory of Sciences and techniques of Automatic control & computer engineering (Lab-STA) Universite de Sfax Sfax TN

Due to the increasing complexity of photovoltaic systems and problems linked to development and design, verification of the entire system operation is essential before real implementation. Besides, high requirements of a real-time simulation and control circuit prototyping before application increases safeness, and can reduce time and costs of implementation. For this end, the purpose of this work is to achieve photovoltaic system development and its design verification through system simulation using FPGA device. The verification method used in this study is the “Hardware-In-the-Loop” (HIL) simulation method. It provides an effective platform for developing and testing real time embedded systems. In this paper, we design the power circuit and we develop the open-circuit voltage controller which tracks the maximum power point. Then, the HIL simulation process is performed for the photovoltaic system. The efficiency of the photovoltaic system is validated by the simulation results.

关键词： Photovoltaic systems Mathematical model Field programmable gate arrays Integrated circuit modeling Digital signal processing Computational modeling

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Generalized integrated interleaving BCH codes

Generalized integrated interleaving BCH codes

引用

IEEE International Symposium on Information Theory

作者： Yingquan Wu Department of Engineering University Campus Bio-Medico of Rome Unit of Computer Systems and Bioinformatics Italy Laboratory of Sciences and Techniques of Automatic control and computer engineering (Lab-STA) University of Sfax Sfax Tunisia

ISBN: (纸本)9781509018079

Tang and Koetter proposed generalized integrated interleaved Reed-Solomon codes in which each code of the second layer belongs to different subcode of the first layer code. However, the original scheme is inapplicable to binary BCH codes since its integrating coefficients are general finite field elements. In this work we propose a novel generalized integrated interleaving scheme over binary BCH codes, derive a lower bound on the minimum distance, and further present an algebraic encoding and decoding algorithm.

关键词： Encoding Decoding Redundancy Systematics Generators Power demand

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Efficiency Optimization of Induction Motor Using a Modified Gray Wolf Optimization

Efficiency Optimization of Induction Motor Using a Modified ...

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International Conference on sciences and techniques of automatic control and computer engineering (sta)

作者： Oussama Zeghba Salim Chakroun Ali Aillane Research Laboratory on the Electrical Engineering University of M'Sila Algeria Laboratory of Sciences and Techniques of Automatic Control and Computer Engineering (Lab-STA) National School of Engineering of Sfax (ENIS) University of Sfax Sfax Tunisia

ISBN: (纸本)9781665482622

In this research, a method for improving the efficiency of induction motors based on the modified gray wolf optimizer (mGWO) is proposed and examined. In order to reduce the overall copper and iron losses of the machine, the efficiency improvement technique entails modifying the geometric dimensions with regard to the lower and upper bound of those parameters. A comparison between the findings achieved utilizing the mGWO and GAs approach is done, and some simulation performances are shown along with a comparison of efficiency, electric current, and torque. The approach mGWO provided good results and required less time to extract results once the simulation results were obtained using the aforementioned methods.

关键词： Energy consumption Induction motors Upper bound Torque Simulation Iron Data models

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Adaptive global sliding mode control for multilateral teleoperation systems with varying-time delay

Adaptive global sliding mode control for multilateral teleop...

引用

International Conference on sciences and techniques of automatic control and computer engineering (sta)

作者： Asma Ounissi Neila Mezghani Ben Romdhane Mohamed Boukattaya Laboratory of sciences and technique of automatic control and computing (Lab-STA) National school of engineering of Sfax Sfax Tunisia Laboratory of sciences and technique of automatic control and computing (Lab-STA) Sfax Preparatory Engineering Institute Sfax Tunisia

ISBN: (纸本)9781665482622

In this paper, we suggest an adaptive control for a multilateral teleoperation system (MTS) with an unknown upper limit on the system uncertainty (SU) and varying-time delay (VTD). A novel adaptive global sliding mode (AGSMC) has been addressed, which guarantees the elimination of the reaching phase and forces the tracking error to reach the sliding surface (SS) from the beginning. Moreover, the adaptive tuning law has been addressed in order to deal with the undetermined upper limit of the SU. The convergence and stability analysis of the proposed methods is verified by the Lyapunov stability theory. The simulation is carried out on 1 master, 1 leader, and 3 followers teleoperation system is developed to show the effectiveness of the developed control.

关键词： Uncertainty Simulation Robustness stability analysis Delays Tuning Sliding mode control

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Robust flux and load torque estimation in Induction Machine

Robust flux and load torque estimation in Induction Machine

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European control Conference (ECC)

作者： M. Bahloul L. Chrifi-Alaoui M. Souissi S. Drid M. Chaabane Laboratory of Sciences and Techniques of Automatic Control and Computer Engineering (Lab-STA) University of Sfax Postal Tunisia Laboratory of Innovative Technology (LTI) University of Pi-cardie Cuffies France University of Batna Algeria

We propose in this paper an adaptive robust fuzzy observer to estimate flux and to identify the load torque for Induction Machine's (IM) applications. Indeed, using a fuzzy IM model, we develop the structure of an observer where we consider the load torque as an unknown input. Sufficient conditions are presented to ensure the asymptotic convergence of the flux and the load torque errors estimation. In addition, a robustness criteria is considered, using the L 2 technique, to take into consideration parameters uncertainties. Design conditions are founded on LMIs terms (Linear Matrix Inequalities) and an experimentation (using DSP 1104 real time controller) is carried out to show the effectiveness of the proposed results.

关键词： Torque Observers Rotors stators Robustness Resistance Uncertain systems

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Sensor fault and state estimation for continuous-time descriptor linear systems: An LMI approach

Sensor fault and state estimation for continuous-time descri...

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International Conference on Systems and control (ICSC)

作者： Imen Haj Brahim Mohamed Chaabane Ghani Hashim Driss Mehdi Laboratory of Sciences and Techniques of Automatic control and computer engineering (Lab-STA) University of Sfax Sfax Tunisia Computer Science Department Cihan University Erbil Iraq LIAS-ENSIP University of Poitiers Poitiers France

ISBN: (纸本)9781467389549

In this paper, the problem of sensor fault diagnosis of continuous-time descriptor linear systems is investigated by using a descriptor observer. An augmented descriptor observer is constructed to simultaneously estimate state and sensor faults. The sensor fault is considered as an auxiliary state variable. The admissibility of the descriptor observer is investigated in term of Linear Matrix Inequalities (LMIs), so they are tractable using numerical computations. Finally, a numerical example and an application to a suspension model illustrate the ability of the proposed fault diagnosis approach.

关键词： Observers Fault diagnosis Linear matrix inequalities Robot sensing systems Linear systems Biological system modeling

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Takagi Sugeno fuzzy observer based Direct Rotor Field Oriented control of induction machine

Takagi Sugeno fuzzy observer based Direct Rotor Field Orient...

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International Conference on Systems and control (ICSC)

作者： Mohamed Bahloul Mansour Souissi Mohamed Chaabane Larbi Chrifi-Alaoui Universite de Sfax Sfax TN Laboratory of Sciences and Techniques of Automatic Control and Computer Engineering (Lab-STA) University of Sfax Sfax Tunisia Laboratory of Innovative Technology (LTI) University of Picardie Cuffies France

This paper proposes a Takagi Sugeno (TS) fuzzy field observer in a rotor-flux-oriented reference frame. The proposed approach dealt with the conventional Direct Rotor Field Oriented control (DRFOC) in a high speed application. The main aims are to provide new methods to observe the flux in same reference frame as the controller. In the initial development, we propose a TS model for the induction machine. Later, a TS fuzzy full order observer is described. Then a stability and a D-stability analysis are presented to proof in the first time, the stability and to garret in the second time, some dynamic behaviour for the observer through the Lyapunov theory. The proposed results are based on LMIs terms (Linear Matrix Inequalities) which can be solved easily using Matlab tools. A numerical example is provided to show the effectiveness of the proposed results.

关键词： Observers Rotors Symmetric matrices stability analysis Induction motors IP networks

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