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Structural estimation of Wiener-Hammerstein mathematical models

Structural estimation of Wiener-Hammerstein mathematical mod...

引用

International Conference on Systems and control (ICSC)

作者： Afef Ghanmi Samira Kamoun Sofien Hajji Laboratory of Sciences and Techniques of Automatic Control and computer engineering (Lab-STA) Tunis University Tunis Tunisia Laboratory of Sciences and Techniques of Automatic Control and computer engineering (Lab-STA) University of Sfax Sfax BP Tunisia

In nonlinear system identification, block-oriented models such as Wiener and Hammerstein models have the advantage that they are quite simple to understand and easy to use. This paper presents a structural estimation of the Wiener-Hammerstein model, which is a block-oriented model where a static nonlinear system is surrounded by two linear dynamics at its input and output. The first part concerns the estimation of the order that is made by the ratio method of determining (DR). The second part describes the problem of estimating the delay. In this sense, estimation method is proposed namely estimation algorithm RLSVT. The analytical results are validated by numerical simulation examples.

关键词： Mathematical model Delays Estimation Polynomials Nonlinear dynamical systems Numerical models

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Robust self-tuning regulation for the stochastic systems described by ARARMAX mathematical models

Robust self-tuning regulation for the stochastic systems des...

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

作者： Nabiha Touijer Samira Kamoun Laboratory of Sciences and Techniques of Automatic control and computer engineering (Lab-STA) University of Sfax Sfax Tunisia

This communication deals with the explicit scheme of robust self-tuning regulation of a class of stochastic systems, which can be described by the input-output Auto-Regressive Auto-Regressive Moving Average with exogenous (ARARMAX) mathematical model with unknown and time-varying parameters in presence of unmodelled dynamics. This explicit regulation scheme is based on the proposed modified filtering recursive least squares algorithm with dead zone (m-F-RLS) in the step of estimation. Numerical simulation results of the developed explicit schemes of minimum variance self-tuning regulator, which are applied to the climate control in building, are given.

关键词： Estimation Mathematical model Heuristic algorithms Stochastic systems Robustness computers Noise

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Robust control of wheeled mobile robot in presence of disturbances and uncertainties

Robust control of wheeled mobile robot in presence of distur...

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

作者： Yasmine Koubaa Mohamed Boukattaya Tarak Damak University of Sfax Laboratory of Sciences and Techniques of Automatic control & computer engineering (Lab-STA) Sfax Tunisia

This paper deals with the trajectory tracking control problem of nonholonomic wheeled mobile robot, in the presence of external disturbances and parameters uncertainties. The computed torque controller may be used to make convergence of WMR on desired trajectory. Due to the weak of performance against external disturbances, a sliding mode controller is presented. The stability of the controllers is proven by utilizing the Lyapunov stability theory.

关键词： Mobile robots Wheels Kinematics Uncertainty Vectors Equations Torque

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A novel maximum power point tracking algorithm for photovoltaic systems

A novel maximum power point tracking algorithm for photovolt...

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

作者： Asma Zaidi Karim Dahech Tarek Damak Laboratory of Sciences and Techniques of Automatic Control and Computer Engineering (Lab-STA) University of Sfax Sfax Tunisia

ISBN: (纸本)9781509034086

A maximum power point tracking method based on fast terminal sliding mode control (FTSMC) for photovoltaic systems is introduced in this work. The control scheme contains two loops: the first achieves the maximum power point (MPP) searching via an incremental conductance algorithm which provides the reference voltage (MPV). The second loop performs the regulation of the operating point to the reference MPV. Simulations results have proved the efficiency of the proposed method.

关键词： Mathematical model Maximum power point trackers Photovoltaic systems Temperature Sliding mode control Algorithm design and analysis

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Sliding mode multiple observer for perturbed output nonlinear systems

Sliding mode multiple observer for perturbed output nonlinea...

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

作者： Kaïs Hfaiedh Karim Dahech Yosra Massaoudi Tarak Damak Laboratory of Sciences and Techniques of Automatic control and computer engineering (Lab-STA) University of Sfax Sfax Tunisia

ISBN: (纸本)9781467392358

This paper deals with the problem of state estimation for perturbed output nonlinear systems. A multiple models approach is used to describe such class of systems. Then a structure of Lyapunov based sliding mode multiple observer is presented. The stability proof of the observer is ensured by a suitable choice of estimation gains which are solutions of a set Linear Matrix Inequalities(LMI). The simulation results for the denitrification application demonstrate the effectiveness of the developed estimator scheme.

关键词： Observers Nonlinear systems Robustness stability analysis Asymptotic stability computers

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Sliding Mode control In A Wind Turbine System

Sliding Mode Control In A Wind Turbine System

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

作者： Atef Jemmali Khaled Elleuch Hafedh Abid Ahmed Toumi Laboratory of Sciences and Techniques of Automatic control & computer engineering (Lab-STA) National School of Engineering of Sfax Sfax Tunisia

ISBN: (纸本)9781665482622

This paper is interested in the control of a DFIG by a sliding mode controller, used in a wind system. The conversion chain comprises a three-blade turbine, the DFIG, a rotor-side converter, a capacitor, grid-side converter and a line-side filter. The sliding mode control is used to control the direct and quadratic current of the rotor; this type of regulator was used especially for its robustness against the parametric variations of the generator.

关键词： Regulators Capacitors Doubly fed induction generators Rotors Robustness Generators Wind turbines

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MPPT of a PV panel based on fuzzy logic and sliding mode controller

MPPT of a PV panel based on fuzzy logic and sliding mode con...

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

作者： Taleb Hamdi Khaled Elleuch Hafed Abid Ahmed Toumi National School of Engineering of Sfax Laboratory of Sciences and Techniques of Automatic control & computer engineering (Lab-STA) Sfax Tunisia

ISBN: (纸本)9781665482622

In this work we present a sliding mode controller to control a boost DC-DC converter inserted in a photovoltaic system. The controller includes a combination between Fuzzy logic supervisor and sliding mode control to extract maximum power from PV systems. The proposed algorithms is compared with conventional algorithms such as the Perturb and observe (P&O) algorithm, incremental conductance (InC) and also unconventional algorithms such as FLC while varying irradiation. The simulation results confirm the performance and its robustness compared to other controllers.

关键词： Fuzzy logic Photovoltaic systems Radiation effects Adaptation models Simulation Regulation Robustness

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Fault Detection and Location for VSC- HVDC Systems with the Coexistence of AC and DC Faults by Using PSO- Neural Network

Fault Detection and Location for VSC- HVDC Systems with the ...

引用

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

作者： Raad Salih Jawad Hafedh Abid Lab of Sciences and Techniques of Sciences and Techniques Automatic control and computer engineering (Lab-STA) National School of Engineering of Sfax Sfax Tunisia

ISBN: (纸本)9781665482622

Superior power quality and less transmission loss are features of HVDC transmission. However, fault location and clearing technology are less advanced compared to their AC counterparts. The convergence rate and classification accuracy of the learning process can be enhanced by particle swarm optimization (PSO); the PSO method has been selected and employed in this study's feedforward neural network. This paper proposes a fault localization technique for a 75-kilometer, two-terminal VSC-HVDC system by using the wavelet transform (WT) and the PSO with artificial neural networks (PSO- NN). The HVDC system is simulated with MATlab, and the results are then processed with WT, PSO-ANN, and both traditional and conventional ANN. The eight DC faults in various places and the simultaneous AC faults are the faults in this study. To examine the impact of these two factors on the suggested fault location approach, the simulation is run while varying fault resistance and location along a 75-kilometer distance. The result shows that it is possible to anticipate the fault location pretty reliably and with little error. Additionally, PSO-ANN performance has demonstrated its advantage over conventional ANN.

关键词： Resistance Wavelet transforms Software packages HVDC transmission Artificial neural networks Fault location Wavelet analysis

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Mamdani fuzzy parameter estimation algorithm for large-scale interconnected nonlinear systems ∗ 21

Mamdani fuzzy parameter estimation algorithm for large-scale...

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21st IEEE International Conference on sciences and techniques of automatic control and computer engineering, sta 2022

作者： Elloumi, Mourad Naifar, Omar Gassara, Hamdi National School of Engineers of Sfax Laboratory of Sciences and Techniques of Automatic Control and Computer Engineering Sfax Tunisia National School of Engineers of Sfax Control and Energy Management Laboratory Sfax Tunisia

ISBN: (纸本)9781665482615

For the category of large-scale nonlinear processes that are composed of a set of linked monovariable systems and represented by discrete input-output models with unknown time-varying coefficients, the current study proposes a recursive algorithm of maximum likelihood estimation based on the fuzzy inference technique. This recursive estimator employs a prediction error strategy and a maximum likelihood estimation algorithm to formulate the issue of estimating the parameters of the process under consideration. The established parameter estimation approach is enhanced by the addition of the Mamdani fuzzy inference system. A numerical simulation exemplar is used to verify the efficacy of the generated theoretical results.. © 2022 IEEE.

关键词： Maximum likelihood estimation

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Implementation of a Maximum Power Point Tracking fuzzy controller on FPGA circuit for a photovoltaic system

Implementation of a Maximum Power Point Tracking fuzzy contr...

引用

International Conference on Intelligent Systems Design and Applications (ISDA)

作者： Hanen Abbes Kais Loukil Hafedh Abid Mohamed Abid Ahmad Toumi Laboratory of Computer and Embedded Systems (Lab-CES) Laboratory of Sciences and Techniques of Automatic control & computer engineering (Lab-STA) University of Sfax Sfax Tunisia

ISBN: (纸本)9781467387101

Owing to the complexity of photovoltaic systems and their specific behavior, researchers are substantially prompted by the FPGA circuit for prototyping and testing photovoltaic system. In addition, to improve the efficiency of the photovoltaic system, Maximum Power Point Tracking (MPPT) is an essential technique that enables photovoltaic panel delivers its maximum output power. Fuzzy logic technique seems to be an efficient solution that ensures optimal operation of photovoltaic system. For this end, this work aim to implement a fuzzy logic MPPT technique on FPGA circuit to control a photovoltaic system. The system composed of photovoltaic panel, boost converter and the fuzzy logic controller using FPGA device to control boost converter switch is designed and implemented. Simulation results exhibit an efficient operation of FPGA based photovoltaic system.

关键词： Load modeling Hardware Photovoltaic systems Junctions Table lookup Random access memory

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