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Robustesse d’une loi de commande d’un redresseur triphasé pour l’alimentation électrique d’un appareil d’imagerie médicale de forte puissance impulsionnelle

Abstract : The design of a robust and efficient three-phase rectifier is a key issue in the power supplies of future medical imaging system such as X-ray scanners to increase their power and speed.This application imposes a large variability of operating points on the rectifier:(i) At the output, the load is of the pulse type with power variations of more than 100 kW.(ii) At the input, the nominal input voltage and input grid impedance are variable from one installation to another. And the instant input voltage varies normally on a +/-10% range, and abnormally from 0 to 500% of the nominal value.The double Vienna topology with coupled inductors and interleaved controls is chosen for its efficiency, reliability and low volume.The chosen control law consists of three control loops: (i) regulation of the total output voltage, (ii) power factor correction of the input currents, (iii) balancing of the two output voltages.A strong constraint is the changing dynamics of the input currents which pass through different conduction modes over the same grid period.Two linear models of the currents are developed:the linearised averaged model for the continuous conduction modes, and an original model developed in this thesis for the discontinuous conduction modes.The performance of the regulation is verified in simulation and experimentally.The robustness of the control is assessed by analysing the frequency responses and the single-variable and multivariable stability margins of the linear models developed in this thesis.The robustness of the global regulation to the phenomena defined by the ITIC curve of grid overvoltage and voltage drop is confirmed in simulation.
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https://theses.hal.science/tel-03868265
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Submitted on : Wednesday, November 23, 2022 - 4:54:10 PM
Last modification on : Monday, November 28, 2022 - 8:59:36 AM

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  • HAL Id : tel-03868265, version 1

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Matthieu Darnet. Robustesse d’une loi de commande d’un redresseur triphasé pour l’alimentation électrique d’un appareil d’imagerie médicale de forte puissance impulsionnelle. Automatique / Robotique. Université Paris-Saclay, 2022. Français. ⟨NNT : 2022UPASG009⟩. ⟨tel-03868265⟩

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