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Theses

Comportement dynamique non-linéaire dans les convertisseurs statiques : régulateurs de courant et stabilité des réseaux DC

Abstract : This thesis discusses the study of dynamic behavior in power electronics systems. The nature of cycles defined by the state variables of the system can be settled either by a bifurcation diagram or by Floquet multipliers obtained from the discrete model of the converter. However, for certain structures of static converters, a discrete model cannot be obtained without introducing large assumptions. The flip bifurcations (fast-scale) cannot be predicted by the averaged model whereas they appear in many statics converters. A new formulation of a continuous averaged model is presented to estimate the first bifurcation point (flip, Hopf ...). The proposed methodology is applied to a boost converter, operated in continuous conduction mode, controlled by different types of fixed frequency switching current controllers. Then, this averaged model is used for the design of the current controller parameters associated with an active filter system. The variables obtained by the proposed model have been validated by numerical simulation and experimental results. Methods of analysis of limit cycles are extended to study the stability of DC networks when the cutoff frequency of the LC filter between the voltage source and the converter is close to the switching frequency of converters. Different discrete-time models have been developed in order to consider whether to use sampled or no-sampled converter control
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https://hal.univ-lorraine.fr/tel-01749277
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Submitted on : Thursday, March 29, 2018 - 12:11:32 PM
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Roghayeh Gavagsaz Ghoachani. Comportement dynamique non-linéaire dans les convertisseurs statiques : régulateurs de courant et stabilité des réseaux DC. Autre. Université de Lorraine, 2012. Français. ⟨NNT : 2012LORR0102⟩. ⟨tel-01749277⟩

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