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Houssamo I.,AVENUES GSU | Wang B.,AVENUES GSU | Sechilariu M.,AVENUES GSU | Locment F.,AVENUES GSU | Friedrich G.,CNRS Electromechanical Laboratory of Compiegne
IEEE International Symposium on Industrial Electronics | Year: 2012

The photovoltaic (PV) power prediction is necessary for dealing with the grid vulnerability by smart grid messages, and could reduce the negative impact due to the unpredictable power injection into the grid. For a DC microgrid with PV-storage integrated system, this paper aims to present a simple experimental prediction model of a PV panel. The proposed model is based on indoor measurements and allows predicting the maximum output power of the PV panel at given irradiance and cell temperature. Compared to two other models, a linear power model and a single-diode model, experimental tests prove the reliability of the proposed model and validate the method. © 2012 IEEE. Source

Le Besnerais J.,Ecole Centrale Lille | Lanfranchi V.,CNRS Electromechanical Laboratory of Compiegne | Hecquet M.,Ecole Centrale Lille | Brochet P.,Ecole Centrale Lille
IEEE Transactions on Industrial Electronics | Year: 2010

This paper derives the analytical characterization of the Maxwell radial vibrations due to pulsewidth modulation (PWM) supply in induction machines and, particularly, in traction motors supplied with an asynchronous switching frequency. The number of nodes and the velocity of these particular force waves are experimentally validated by visualizing some operational deflection shapes of the stator. It is shown that according to the switching frequency, these forces can be responsible for high magnetic-noise levels during starting and braking. A simple rule to avoid PWM noise is then proposed and applied to an industrial traction motor. Experimental results show that the choice of the switching frequency can have a 15-dB impact on the sound power level emitted by the motor during starting and that a lower switching frequency can sometimes lead to lower magnetic noise. In agreement with analytical predictions, the new proposed switching frequency that avoids resonances between PWM exciting forces and corresponding stator modes reduces the magnetic noise of 5 dB during starting. © 2010 IEEE. Source

Le Besnerais J.,University of Lille Nord de France | Fasquelle A.,University of Lille Nord de France | Fasquelle A.,University of Valenciennes and HainautCambresis | Hecquet M.,University of Lille Nord de France | And 5 more authors.
IEEE Transactions on Industrial Electronics | Year: 2010

The design of variable-speed electrical machines involves several fields of physics, such as electromagnetism, thermics, mechanics, and also acoustics. This paper describes the analytical multiphysics models of a computer-aided-design software which is applied to inverter-fed traction induction machines. The electromagnetic model computes rotor and stator currents, the induction-machine traction characteristics, and the radial air-gap flux density. The mechanical and acoustic models compute the motor's audible magnetic noise level due to Maxwell forces. The thermal model based on 3-D nodal network computes the transient temperature of different parts of the motor. These fast models make it possible to couple the software with some optimization tools. Some simulation results are presented on a self-ventilated closed motor and compared to experiments. © 2010 IEEE. Source

Pellerey P.,CNRS Electromechanical Laboratory of Compiegne | Pellerey P.,Renault S.A. | Lanfranchi V.,CNRS Electromechanical Laboratory of Compiegne | Friedrich G.,CNRS Electromechanical Laboratory of Compiegne
IEEE Transactions on Magnetics | Year: 2012

An automatic and fast numerical coupling method between 2-D electromagnetic and 3-D structural FEM software is presented. The described coupling method permits to compute the electromagnetic noise in electric machines for different realistic alimentation currents. Thanks to this tool, the strong influence of the supply harmonics on the acoustic level of a synchronous machine is clearly shown. This method has been developed for a wound rotor synchronous machine (WRSM) but can be applied for any non-skewed machines. First of all, the global principle of the study and the magnetic noise theory is briefly introduced. Then, computation algorithms coupling magnetic forces to structural mesh are developed and finally simulation results show the influence of supply harmonics on global vibration levels. © 2012 IEEE. Source

Nguyen T.D.,CNRS Electromechanical Laboratory of Compiegne | Hobraiche J.,Valeo Electrical Management Systems | Patin N.,CNRS Electromechanical Laboratory of Compiegne | Friedrich G.,CNRS Electromechanical Laboratory of Compiegne | Vilain J.-P.,CNRS Electromechanical Laboratory of Compiegne
IEEE Transactions on Industrial Electronics | Year: 2011

This paper presents direct digital technique-generalized discontinuous pulse width modulation (PWM)-a new implementation method for an optimal discontinuous PWM (DPWM) in terms of switching losses of the inverter on an embedded system. At each sampling period, an optimal choice is done in order to clamp one of the three half-bridges. Its advantages compared to classic ones (DPWM) are as follows: needless to know the load power factor, operational under steady-state and dynamic operating conditions, and low computation time. The proposed algorithm is then verified by simulation. Experimental results, based on a resistance-inductance load and a starter-generator application, are provided to show its effectiveness. © 2010 IEEE. Source

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