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Variateur de vitesse à impact électromagnétique réduit : onduleur multiniveaux et nouvelles stratégies de modulation

Abstract : Among power electronic converters, variable speed drives are responsible for high frequency electromagnetic disturbances such as common mode currents and motor overvoltages. This work aims at reducing these phenomena by using a multilevel converter controlled with new modulation schemes. A state of the art of existing attenuation techniques is presented, and the three-level neutral-point-clamped (NPC) inverter is retained as direct- to alternative-current converter topology. A new pulse-width-modulation (PWM) strategy is developed for the reduction of common mode currents generated by the inverter. The power switches commutation process is analyzed and modelled in order to establish specific constraints that maximize the efficiency of the proposed strategy. Meanwhile, the use of long cables between drives and electric machines highlights a drawback regarding motor overvoltages, which is kept under control by appropriate use of the degrees of freedom of the new PWM. Eventually, the issue of neutral point balancing is worked out. The proposed modulation strategy is experimentally implemented through a new carried-based modulator, and measurement results confirm a five-decibel gain on common mode currents upon conventional strategies while ensuring motor overvoltages limitation as well as neutral point balancing.
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Contributor : Arnaud Videt <>
Submitted on : Tuesday, March 3, 2009 - 2:59:59 PM
Last modification on : Monday, December 7, 2020 - 6:32:03 PM
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Arnaud Videt. Variateur de vitesse à impact électromagnétique réduit : onduleur multiniveaux et nouvelles stratégies de modulation. Energie électrique. Ecole Centrale de Lille, 2008. Français. ⟨tel-00365461⟩

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