Babak Nahid-Mobarakeh

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This paper introduces a new fault-tolerant operation method for a symmetrical six-phase induction machine (6PIM) when one or several phases are lost. A general decoupled model of the induction machine with up to three open phases is given. This model illustrates the existence of a pulsating torque when phases are opened. Then, a new control method reducing(More)
It is known that the interaction between poorly damped <i>LC</i> input filters and constant power loads (CPLs) leads to degradation of dynamic performance or system instability. This paper addresses a large-signal stability study and stabilization of an electrical system containing a dc power supply, an <i>LC</i> filter, and a CPL. This latter is realized(More)
This paper provides an improvement in sensorless control performance of nonsalient-pole permanent-magnet synchronous machines. To ensure sensorless operation, most of the existing methods require that the initial position error as well as the parameters uncertainties must be limited. In order to overcome these drawbacks, we study them analytically and(More)
Interturn stator winding fault is one of the most frequent faults in permanent-magnet synchronous machines (PMSMs). In this paper, we present a new technique for online detection of this fault in PMSMs. It is based on a residual analysis improved by taking into account back-electromotive force waveform estimation, inverter model, and unbalanced inductance(More)
In this paper, a model-reference based on-line identification method is proposed to estimate PMSM parameters. The global stability of the augmented system is analyzed using the second method of Lyapunov and the singular perturbations theory. It is shown that this method may be applied with a decoupling control technique that improves convergence dynamics(More)
In this paper, a model-reference-based online identification method is proposed to estimate permanent-magnet synchronous machine (PMSM) parameters during transients and in steady state. It is shown that all parameters are not identifiable in steady state and a selection has to be made according to the user's objectives. Then, large signal convergence of the(More)
This paper deals with a hybrid energy source consisting of a proton exchange membrane fuel cell, two storage devices, and a load. Generally, this type of source constitutes of nonisolated dc-dc converters. In order to have galvanic isolation for safety reasons and a high voltage ratio, we introduce another system based on the use of three-port isolated(More)
In this paper, the classical vector control of six-phase induction machines (SPIM) is analyzed. It is shown that this method is sensitive with respect to the rotor time constant. Then a new vector control law, which minimizes the closed-loop system sensitivity with respect to the motor resistances error, is proposed. It consists in using the back-EMF vector(More)