Afef Fekih

Afef Fekih
University of Louisiana at Lafayette | ULL · Department of Electrical & Computer Engineering

PhD, Electrical Engineering

About

180
Publications
27,820
Reads
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1,587
Citations
Additional affiliations
June 2016 - present
University of Louisiana at Lafayette
Position
  • Professor (Full)
June 2009 - May 2016
University of Louisiana at Lafayette
Position
  • Professor
August 2003 - May 2009
University of Louisiana at Lafayette
Position
  • Professor

Publications

Publications (180)
Article
A new predictive frequency management system is designed for multi-area microgrids (MGs). The uncertainties are online modeled by a deep learned type-2 (T2) fuzzy-logic system (FLS) and singular-value decomposition (SVD) approach. The predictive controller is designed based on the SVD-T2FLS model. The robustness against perturbations is ensured by...
Article
Reliability-centered maintenance (RCM) has recently emerged as a powerful tool to reasonably cut the operation and maintenance cost of power destruction systems, whilst meeting both power quality and reliability requirements. This study introduces a new RMC approach that allocates maintenance budgets based on component criticality and importance. A...
Article
Full-text available
This paper proposes a linear matrix inequality (LMI)-based adaptive barrier global sliding mode control (ABGSMC) for uncertain systems with faulty actuators. The proposed approach is derived using a novel global nonlinear sliding surface to guarantee the global dynamic property and to ensure system stability and the occurrence of sliding in the pre...
Article
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The remarkable properties of sliding mode control (SMC)—such as robustness, accuracy, and ease of implementation—have contributed to its wide adoption by the control community. To accurately compensate for parametric uncertainties, the switching part of the SMC controller should have gains that are sufficiently large to deal with uncertainties, but...
Conference Paper
Full-text available
The recent high penetration of wind energy conversion system (WECS)-based power generators being integrated into power grids demands advanced control techniques to ensure an efficient power production performance. This paper presents an active fault-tolerant nonlinear control strategy for the rotor side converter (RSC) control of doubly fed inducti...
Article
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This study proposes an adaptive barrier functions-based non-singular terminal sliding mode control approach for the trajectory tracking of a quadrotor unmanned aerial vehicle subject to bounded uncertainties and input constraints. First, the state-space equations of the six degrees-of-freedom quadrotor system is introduced in the presence of bounde...
Article
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The paper investigates a leader-following scheme for nonlinear multi-agent systems (MASs). The network of agents involves time-delay, unknown leader's states, external perturbations, and switching graph topologies. Two distributed protocols including a consensus protocol and an observer are utilized to reconstruct the unavailable states of the lead...
Article
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The integration of power-electronics-based power plants is developing significantly due to the proliferation of renewable energy sources. Although this type of power plant could positively affect society in terms of clean and sustainable energy, it also brings adverse effects, especially with the stability of the power system. The lack of inertia a...
Article
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This paper proposes a linear matrix inequality (LMI)-based fuzzy fast terminal sliding mode control (FFTSM) approach for a multi-input multi-output (MIMO) system. This design aims to achieve the finite-time convergence of system trajectories to their desired values, while at the same time eliminating the chattering problem. Finite-time stability is...
Article
In this study, a novel barrier function-based adaptive non-singular terminal sliding mode control methodology is suggested for robust stability of disturbed nonlinear systems. It is proved that the barrier function-based control method can force the state trajectories to converge to a region near origin in the finite time. A sufficient criterion is...
Chapter
Precise detection and classification of voltage events would require very detailed investigation from a very large pool of data. There exist several data mining and parametric analysis techniques to detect voltage events, however, they are computationally burdensome. In this chapter, a symbolic aggregate approximation (SAX)-based data mining tool i...
Chapter
Remote Area Power Supply (RAPS) systems can play an effective role in supplying electric power to rural and remote communities. RAPS systems are traditionally powered by non-renewable sources. The growing environmental awareness and improved technology have led to the increased penetration of renewable sources into the grid. However, the intermitte...
Article
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This paper proposes a type-2 fuzzy controller for floating tension-leg platforms in wind turbines. Its main objective is to stabilize and control offshore floating wind turbines exposed to oscillating motions. The proposed approach assumes that the dynamics of all units are completely unknown. The latter are approximated using the proposed Sugeno-b...
Article
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The increased penetration of renewable energy sources (RESs) along with the rise in demand for wireless communication had led to the need to deploy cellular base stations powered by locally accessible RESs. Moreover, networks powered by renewable energy sources have the ability to reduce the costs of generating electricity, as well as greenhouse ga...
Article
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This paper proposes an auxiliary damping control approach based on the wide-area measurement system (WAMS). Its main objective is to mitigate sub-synchronous resonance (SSR) in doubly fed induction generator (DFIG)-based wind farms connected to a series capacitive compensated transmission network. To mitigate the delay in sending measurement signal...
Article
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Active suspension systems are critical components that play a decisive role in improving ride comfort and maneuverability of vehicles. However, inevitable road disturbances and parameter uncertainties, such as variation of the payload mass and some suspension components, lead to control performance deterioration. This paper synthesizes a tube-based...
Article
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Air pollution is one of the major issues in urban management. City managers and planners pay a great deal of attention to this problem given its harmful effect on people’s health and the environment. This paper proposes a simulated model of the pollution level of the capital city of Tehran along with its source and outcomes based on system dynamics...
Article
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This study investigates the challenging and complicated issue of full-state constraint attitude control for rigid bodies under actuators physical limitation. Using the concept of prescribed performance control (PPC), a novel proportional-derivative (PD)-type control is introduced by which both the attitude quaternion and the rotation velocity of th...
Article
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This paper proposes a novel scheme of the multi-objective robust control design for a class of uncertain nonlinear systems in strict-feedback-form based on Takagi–Sugeno fuzzy model (TSFM). The nonlinear system contains both the matched and the unmatched uncertainties and also subjected to the external disturbances. The TSFM provides the generaliza...
Article
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The problem of attitude control for rigid spacecraft under the attitude and angular velocity constraints is investigated in this study. Particularly, a simple structure constrained proportional-derivative (PD)-like control is proposed which contains two portions. The first portion is a conventional PD control to provide convergence of the system st...
Article
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In this paper, the theory of control is considered on nonlinear systems. A closed-loop controller with a strong idea has been introduced to track system states and guarantee asymptotically stability. The proposed method is the indirect terminal sliding mode control technique based on adaptive and fuzzy rules, which has used the continuous barrier f...
Article
This study proposes a nonsingular barrier-function-based terminal sliding mode control technique for $n$ th-order nonlinear dynamic systems. Its main objective is to guarantee the finite-time tracking performance in the presence of unmodeled dynamics, external disturbances and parameter variations. The proposed approach is synthesized using a novel...
Article
This study proposes an observer-based Composite Nonlinear Feedback (CNF) controller for the robust tracking of uncertain singular systems with input saturation, nonlinear function, time-delay, and disturbances. The suggested control law is designed based states reconstructed using a singular observer so as to increase steady-state accuracy and impr...
Article
This paper proposes a control topology that integrates the robust performance of fractional order sliding mode control with the high charging/discharging rate and low maintenance requirements of super-capacitors to improve the transient stability of wind energy systems. The observer-based fractional-order sliding mode control (FOSMC) approach is de...
Article
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Background: The use of renewable energies is extended due to their valuable features such as abundant and clarity. The microgrids that include the renewable energies are widely used in various applications such as power supplying of remote areas, increasing the network reliability, reducing the greenhouse gas emission, reducing the consumption dema...
Article
This paper proposes a fault tolerant control framework for a DFIG-based wind energy conversion system (WECS) in a hybrid wind/PV microgrid structure. It implements a fractional order sliding mode control (SMC) for the DFIG converters to mitigate the grid faults and ensure robustness against mismatched uncertainties. It also includes a shared reacti...
Article
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This paper proposes an H∞ reset unknown input observer (R-UIO) based on the Takagi-Sugeno (T-S) fuzzy model for the state estimation of nonlinear uncertain systems. Firstly, H∞ unknown input observer (UIO) is designed for TSFM-based nonlinear systems with measurable and unmeasurable premise variables. Then, according to the importance of observers...
Article
This paper proposes a discrete-time sliding mode control design for a class of discrete-time dynamic systems with time delays, parameter uncertainties, and external disturbances. The robust design implements an adaptive discrete-time reaching law in order to reduce the effect of the chattering phenomena and improve system robustness. It also consid...
Article
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This work presents a nonlinear control approach to maximize power extraction of wind energy conversion systems (WECSs) operating below their rated wind speeds. Due to nonlinearities associated with the dynamics of WECSs, the stochastic nature of wind, and the inevitable presence of faults during in practice, developing reliable fault-tolerant contr...
Article
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This paper proposes an adaptive integral-type terminal sliding mode tracking control approach based on the active disturbance rejection for uncertain nonlinear systems subject to input saturation and external disturbances. Its main objective is to achieve zero tracking error in the presence of external disturbances, parametric uncertainties and inp...
Article
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ABSTRACT This paper proposes an adaptive non-singular fast terminal sliding mode control (FTSMC) with integral surface for the finite time tracking control of nonlinear systems with external disturbances. An appropriate parameter-tuning adaptation law is derived to tackle the disturbances. A new fast terminal sliding scheme with self-tuning algorit...
Article
This paper proposes a fault ride through scheme for doubly-fed induction generator (DFIG)-based wind energy systems. The proposed framework combines the robustness properties of fractional order sliding mode control (FOSMC) with the active/reactive power control capability of dynamic voltage restorer (DVR) and high-power density of superconducting...
Article
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This paper proposes a novel robust proportional integral non-singular terminal synergetic control (PI-NTSC) for a class of affine nonlinear systems. To counteract the effects of the disturbances, a hybrid nonlinear disturbance observer (HNDOB) scheme is proposed to estimate the matched and mismatched disturbances. A novel proportional integral non-...
Article
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Wind turbines (WTs) are often operated in harsh and remote environments, thus making them more prone to faults and costly repairs. Additionally, the recent surge in wind farm installations have resulted in a dramatic increase in wind turbine data. Devising intelligent condition monitoring and fault warning systems are crucial to improving the effic...
Article
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This paper proposes a novel passivity cascade technique (PCT)-based control for nonlinear inverted pendulum systems. Its main objective is to stabilize the pendulum’s upward states despite uncertainties and exogenous disturbances. The proposed framework combines the estimation properties of radial basis function neural networks (RBFNs) with the pas...
Article
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This paper presents a disturbance observer-based nonsingular terminal sliding mode control design for a myringotomy surgical device. The methodology is established to control a semi-automated hand-held ear surgical device for the treatment of otitis media with effusion. Otitis media with effusion is the collection of bacterial fluid in the middle e...
Article
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A chameleon chaotic system is a chaotic system in which the chaotic attractor can change between hidden and self-excited attractor depending on the values of parameters. In this work, we construct a family of nine new chameleon chaotic systems by introducing two parameters to the 3-D chaotic systems with quadratic nonlinearities and exhibiting line...
Article
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This paper proposes an adaptive sliding mode observer (ASMO)-based approach for wind turbines subject to simultaneous faults in sensors and actuators. The proposed approach enables the simultaneous detection of actuator and sensor faults without the need for any redundant hardware components. Additionally, wind speed variations are considered as un...
Article
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This paper proposes an adaptive integral-type terminal sliding mode approach for the attitude and position tracking control of a quadrotor UAV subject to model uncertainties and external disturbances. First, an integral-type terminal sliding tracker is designed to attain the quadrotor UAV tracking performance in finite time when the upper bound of...
Article
Full-text available
This paper proposes an active fault-tolerant control (FTC) scheme for robotic manipulators subject to actuator faults. Its main objective is to mitigate actuator faults and maintain system performance and stability, even under faulty conditions. The proposed FTC design combines the robustness and finite time convergence of non-singular terminal syn...
Article
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This paper proposes an adaptive fault tolerant control (FTC) design for a variable speed wind turbine (WT) operating in the high wind speeds region. It aims at mitigating pitch actuator faults and regulating the generator power to its rated value, thereby reducing the mechanical stress in the high wind speeds region. The proposed FTC design impleme...
Article
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This paper proposes a novel adaptive intelligent global sliding mode control for the tracking control of a DC-DC buck converter with time-varying uncertainties/disturbances. The proposed control law is formulated using a switching surface that eliminates the reaching phase and ensures the existence of the sliding action from the start. The control...
Article
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This article proposes a fast reaching finite time synchronization approach for chaotic systems along with its application to medical image encryption. First, an adaptive terminal sliding mode tracking approach with fast reaching condition is designed to synchronize the chaotic systems at the transmitter and receiver ends in finite time. Then, a cha...
Article
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This paper proposes a finite time chaos synchronization approach for the secure communication of satellite imaging. To this end, chaotic oscillators are considered in both the transmitter and receiver ends to generate the chaotic encryption/decryption keys. To mitigate the non-negligible channel time-delay between the receiver and transmitter, we p...
Article
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This study develops a novel robust control approach for a nonlinear clutchless automated manual transmission (CAMT) in pure electric vehicles. The developed approach comprises model predictive control (MPC), observer, and polytopic linear parameter varying (LPV) model with inexactly measured scheduling parameters. The stability of the online-design...
Article
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This paper proposes a disturbance observer-based Sliding Mode Control (SMC) approach for the robust synchronization of uncertain delayed chaotic systems. This is done by, first, examining and analyzing the electronic behavior of the master and slave Sprott chaotic systems. Then, synthesizing a robust sliding mode control technique using a newly pro...
Article
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Achieving accurate and reliable tracking control for nonlinear systems with uncertainties and disturbances is one of the most challenging problems in nonlinear control. In this paper, we propose an adaptive nonsingular integral-type second order terminal sliding mode tracking control for nonlinear systems with uncertainties. First an integral type...
Article
This paper proposes an adaptive attitude stabilization approach for flexible spacecraft subject to uncertainties, external disturbances, actuator saturation and unknown dynamics. The approach is synthesized based on a modified nonsingular fast terminal sliding surface (NFFTSS) and ensures fast and finite-time convergence independently of the initia...
Article
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This paper proposes a novel exponential hyper–chaotic system with complex dynamic behaviors. It also analyzes the chaotic attractor, bifurcation diagram, equilibrium points, Poincare map, Kaplan–Yorke dimension, and Lyapunov exponent behaviors. A fast terminal sliding mode control scheme is then designed to ensure the fast synchronization and stabi...
Article
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In recent years, due to the several advantages of permanent magnet synchronous generator (PMSG), the number of wind farms utilizing this technology has been significantly grown. The determination of the failure mechanism in these devices is the major challenge which has been addressed in many studies. Particularly, response to grid code compliance...
Article
Full-text available
In this article a robust two-layer control scheme is proposed to improve the performance of Four-Wheel Independent-Drive (4-WID) electric vehicles. The main objective is to enhance the lateral motion performance of electric vehicle under various manoeuvres and in the existence of parameter uncertainties and exterior disturbances. The upper-layer co...
Article
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Endowing wind farms (WFs) with fault ride through (FRT) capability is crucial to their continuous availability under various operating conditions. This paper proposes a dynamic adaptive multi-cell fault current limiter (MCFCL) topology to enhance the FRT capability of grid connected WFs. The proposed MCFCL consists of one transient cell (TC) and mu...
Article
Full-text available
This paper proposes a novel non-singular fast terminal sliding control technique for underactuated robotic manipulators. The proposed approach combines the robustness properties of sliding mode-based control approaches with the approximation accuracy of disturbance observers to suppress both matched and mismatched uncertainties. It also solves the...
Conference Paper
This paper proposes a Fault Tolerant Control (FTC) scheme for a 2-DoF robotic system. The design is based on a new integral non-singular terminal sliding mode control (INTSMC) framework and aims at mitigating actuator faults whilst guaranteeing finite time convergence of the states. The design includes a comprehensive actuator fault model that enco...
Cover Page
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Dear colleagues, We are pleased to inform you about a new Call for Papers (CFP) in the International Journal of Electrical Power & Energy Systems (IF: 3.588, Q1) for a Special Issue on: “Power and Energy Systems Operation in Time of Pandemics: Lessons Learned from COVID-19 Lockdown”.
Article
This paper proposes a cost effective and simple design for hybrid wind/PV systems. Its main objective is to endow the system with fault ride through capabilities while eliminating the need for inverters for the PV units. The proposed topology connects the PV system to the DFIG's DC-link via a DC-DC converter, thus reducing cost be eliminating the n...
Article
This paper proposes an adaptive model predictive control (AMPC) approach with online parameter estimation for a V94.2 gas turbine mounted in the Damavand combined cycle power plant (CCPP). The AMPC is designed to simultaneously maintain the speed and temperature responses of the gas turbine within their desired levels in the presence of frequency d...
Article
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In this research work, an output tracking problem of a kind of nonlinear motion control systems influenced by exogenous uncertainties using second-order super-twisting sliding mode control is studied. It is shown that when second-order super-twisting sliding mode control is implemented with finite-time convergent homogeneous extended state observer...