Abderrahim Elfadili

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Abstract. This paper addresses the problem of controlling wind energy conversion (WEC) systems involving permanent magnet synchronous generator (PMSG) fed by IGBT-based buck-to-buck rectifier-inverter. The prime control objective is to maximize wind energy extraction which cannot be achieved without letting the wind turbine rotor operate in variable-speed(More)
Time-discretization of nonlinear continuous systems is intensively resorted to cope with digital implementation. In system control, time-discretization may concern either nonlinear models or nonlinear regulators. This paper focuses on the problem of discrete-time modelling of induction motors. The aim is to get models that can be based upon to get digital(More)
This paper addresses the problem of controlling wind energy conversion systems (WECS) which involve permanent magnet synchronous generator (PMSG) fed by IGBT-based buck-to-buck rectifier-inverter. The goal of control is to maximize wind energy extraction and this needs letting the wind turbine rotor operate in variable-speed mode. Interestingly, the present(More)
We are considering the problem of controlling inductions motors driven through AC/DC rectifiers and DC/AC inverters. The control objectives are threefold: (i) forcing the motor speed to track a reference signal, (ii) regulating the DC Link voltage, (iii) assuring a satisfactory power factor correction (PFC) with respect to the power supply net. First, a(More)
The problem of induction machine speed control is considered. Most previous works considered the machine magnetic characteristic to be linear and the flux reference to be constant. Specifically, the constant flux reference is chosen in the elbow zone of the magnetic characteristic. Doing so, the machine operation mode is not optimal in presence of small(More)
This paper addresses the problem of controlling wind energy conversion systems (WECS) which involve permanent magnet synchronous generator (PMSG) fed by IGBT-based buck-to-buck rectifier-inverter. The goal of the control is to maximize wind energy extraction and this necessitates letting the wind turbine rotor operate in variable-speed mode. The control(More)
We are considering the problem of state estimation in induction motors. One key feature of this work is that the problem is dealt with based upon a model that accounts for the saturation effect of the magnetic circuit characteristic. Indeed, magnetic saturation cannot be ignored, especially when high power machines are considered. The above model is first(More)