Babak Nahid-Mobarakeh

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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)
In this paper, the influence of measurement errors and inverter irregularities on the performance of sensorless control is studied. The control algorithm is based on the back-electromotive-force estimation whose robustness with respect to the machine parameter uncertainties has been already studied by supposing that the current measurements and the power(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)
—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)
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)
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)
It is known that the interaction between poorly damped LC input filters with constant power loads leads to degradation of dynamic performance and instability of the system. This paper addresses the global stability study of an electrical system containing a DC power supply, an LC Filter and a constant power load. This latter is realized by a voltage source(More)
—The presence of an LC input filter in an electrical system often leads to degradation of dynamic performance and instability of the system. This paper addresses the global stability study of an electrical system containing a DC power supply, an LC Filter and a constant power load. This latter is realized by a voltage source inverter–Permanent Magnet(More)