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Mahjoub A.,University of Sfax | Van Assche V.,University of Caen Lower Normandy | Giri F.,University of Caen Lower Normandy | Chaoui F.Z.,University of Rabat Souissi
Asian Journal of Control | Year: 2015

Controlling continuous-time input-delayed nonminimum-phase linear systems is addressed in the presence of actuator saturation and output-disturbances. Focusing on output-reference tracking, the control design is dealt with in the pseudo-polynomials ring. A quite appealing L2 -tracking performance is shown to be achievable in the presence of arbitrary inputs i.e. The output reference and the output disturbance. The performance is formulated in terms of a well defined output-reference mismatch error (ORME), depending on the inputs' rate and their compatibility with the actuator saturation constraint. © 2014 Chinese Automatic Control Society and Wiley Publishing Asia Pty Ltd. Source


Radouane A.,University of Rabat Souissi | Ahmed-Ali T.,University of Caen Lower Normandy | Giri F.,University of Caen Lower Normandy
2014 European Control Conference, ECC 2014 | Year: 2014

The problem of Hammerstein system identification is addressed in presence of a differential hysteresis nonlinearity. The identification process is based on sampled output measurements and an upper bound on the allowed sampling period is provided. One key idea in the identification method design is that the hysteresis element assumes a linear parameterization in presence of a specific class of periodic excitations. Then, a linearly parameterized representation, involving a set of lumped parameters, can be associated to the whole Hammerstein system. The consistent estimation of these lumped parameters is shown to be possible using a hybrid adaptive observer. Finally, the recovery of the true system parameters is achieved using several tools including matrix SVD and nonlinear least-squares estimators. © 2014 EUCA. Source


Radouane A.,University of Rabat Souissi | Giri F.,University of Caen Lower Normandy | Ikhouane F.,Polytechnic University of Catalonia | Chaoui F.-Z.,University of Rabat Souissi
IFAC Proceedings Volumes (IFAC-PapersOnline) | Year: 2014

The problem Wiener systems identification is addressed in presence of hysteresis nonlinearities, presently described by the Bouc-Wen model. The latter is nonlinear differential equation involving unknown parameters, some of which coming in nonlinearly. Except for stability, the linear subsystem is arbitrary and, in particular, it is not given a particular structure. By using sine excitations, the identification problem is reformulated as a set of nonlinear prediction-error optimization problems. The latter will be coped with using nonlinear least squares estimators which will formally be shown to be consistent. © IFAC. Source


Abouloifa A.,Hassan II University | Giri F.,University of Caen Lower Normandy | Lachkar I.,University of Caen Lower Normandy | Chaoui F.Z.,University of Rabat Souissi | And 2 more authors.
Control Engineering Practice | Year: 2014

The problem of controlling single-phase shunt active power filters is addressed in presence of nonlinear loads. The control objective is twofold: (i) compensation of harmonic and reactive currents absorbed by the nonlinear load, this objective is referred to as power factor correction (PFC); (ii) regulation of the inverter output capacitor voltage. A two-loop cascade control strategy is developed that includes an inner-loop designed, using the Lyapunov design approach, to cope with the compensation issue and an outer-loop designed to regulate the capacitor voltage. The controller performances are formally analysed using system averaging theory. The theoretical results are illustrated by simulation. © 2014 Elsevier Ltd. Source

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