To develop more competitive solutions, one of the trends in the development of drive systems for electric and hybrid electric vehicles (EVs/HEVs) is to integrate the power electronic converter and the electric motor. This thesis aims to investigate the performance and the operation of modular converters in integrated motor drive systems for EVs/HEVs. In the first part, the concept of integrated modular motor drive systems for EVs/HEVs is introduced. Three suitable modular converter topologies, namely, the stacked polyphase bridges (SPB) converter, the parallel-connected polyphase bridges (PPB) converter and the modular high frequency (MHF) converter, are evaluated and compared with conventional electric drives in terms of power losses, energy storage requirements, and semiconductor costs. In the second part of the thesis, the harmonic content of the dc-link current of the SPB converter is analyzed. By adopting an interleaving modulation the size of the dc-link capacitor can be reduced without increasing the switching frequency, which is beneficial for achieving a compact integrated system. This method allows for around 80% reduction of the dc-link capacitance for vehicle drives, resulting in a significant size reduction of the power converter and improved integration. Finally, a communication-based distributed control system for the SPB converter is presented. The communication delay arising from the serial communication is inevitable, thus a timing analysis is also presented. It has been found that stability is maintained even when the baud rate of the SPI communication is lower than 1 Mbps, indicating that other communication protocols with lower bandwidths can also be adopted for this topology. The analytical investigations provided in this thesis are validated by experiments on a four-submodule laboratory prototype. Experimental results verify the correctness of the theoretical analysis, as well as the dynamic performance of the distributed control system. / <p>QC 20161121</p>

L’apparition de convertisseurs multicellulaires parallèles entrelacés et magnétiquement couplés a conduit ces dernières années à améliorer les performances des convertisseurs (densité de puissance, efficacité, dynamique,...). Il existe plusieurs topologies d’entrelacement qui utilisent des Transformateurs Interphases. L’objectif principal de cette étude est de trouver parmi ces topologies celles qui sont les mieux adaptées à un contexte d’intégration d’électronique de puissance pour minimiser la taille et réduire les pertes. Une première étape de modélisation a permis d’effectuer une étude comparative de quelques topologies. Un procédé de permutation des phases d’alimentation a été présenté afin de réduire les ondulations du courant de phases et les pertes ohmiques. Les résultats obtenus valident qualitativement l’avantage de la solution retenue par rapport à la solution standard. Enfin, la réalisation pratique d’un prototype de convertisseur modulaire utilisant des Transformateurs Inter-phases est abordé. Il s’agit d’un régulateur chargé d’alimenter les microprocesseurs (1,2V/100A) (Voltage Regulator Module (VRM)) à 5 modules. Les résultats expérimentaux montrent l’avantage de l’utilisation des Transformateurs Inter-phases par rapport à la solution classique / During the last years, using coupled parallel interleaved converters enhances converters performances (power density, efficiency, transient response,...). There are several possible interleaved coupled topologies that use Inter-phases Transformers. The main objective of this study is to find among these topologies the best adapted configuration in a context of power electronics integration in order to minimize converter size and to reduce losses. A model is proposed to compare some topologies. An optimal modified sequence of phase order to reduce current ripple and ohmic losses is presented. The obtained results validate the advantage of the coupled solution compared to the standard solution. At last, the implementation of a modular power converter using Inter-phases Transformers is shown. It is a Voltage Regulator Module (1,2V/100A) that consists of five identical modules. Experimental results show the advantage of using Inter-phases Transformers compared to conventional solution