Recherche & collaboration
Qu’est-ce qui nous rend unique ?
SuperGrid Institute doit son succès aux personnes qui composent nos différents départements de recherche. Nos équipes viennent d’horizons divers, tant industriels qu’universitaires, et la richesse de leur expérience et de leurs compétences rend l’Institut unique.
Chaque personne apporte une expertise spécifique et ce vivier de connaissances offre aux spécialistes de différents domaines la possibilité de collaborer sur des solutions innovantes pour résoudre des problèmes techniques.
L’Institut bénéficie d’étroites relations de collaboration avec des acteurs de l’industrie et des institutions académiques. Alors que les forces complémentaires de nos partenaires apportent des éclairages et des approches innovantes aux défis techniques, nous développons nos départements de recherche en toute indépendance. Des investissements conjoints publics-privés et des projets de collaboration financent le travail.
Les installations de recherche, les plateformes de test et les laboratoires de pointe de SuperGrid Institute sur les sites de Villeurbanne et de Grenoble sont la clé du succès de nos départements de recherche.
Nos dernières publications scientifiques
Power electronic traction transformers in 25 kV / 50 Hz systems: Optimisation of DC/DC Isolated Converters with 3.3 kV SiC MOSFETs
In AC electric trains, power electronic traction transformers (PETT) are multilevel single phase AC/DC converters connected to the AC medium voltage overhead line. For indirect topologies, DC/DC isolated converters are key elements of PETTs. This paper shows a method to design such DC/DC converters, and several variants are considered. Finally, the comparison results, in the case of a 25 kV / 50 Hz power supply and 3.3 kV SiC MOSFETs, show that the variant with a resonant AC link, with only one controlled bridge and a switching frequency lower than the resonant frequency, offers the best efficiency at rated power for a given volume.
A New Energy Management Control of Modular Multilevel Converters for Coping with Voltage Stress on Sub-Modules
This paper investigates the impact of the operating condition on the SM voltage ripples. In particular, it is revealed that under the classical control scheme where the Modular Multilevel Converter internal energy varies naturally with the DC grid voltage, the traditional sizing approach based on the analytical expression of instantaneous SM voltage may fail to respect the SM voltage constraint. To tackle this problem, this paper presents a solution by incorporating the advantages of the explicit energy management and the developed analytical expressions of the SM voltage ripple, which achieves a better utilization of the converter asset.
Packaging Solution for SiC Power Modules with a Fail-to-Short Capability
Fail-to-short packages, which can still carry current after the failure of their semiconductor devices, are required for HVDC applications. However, all existing solutions are dedicated to silicon components. Here, a fail-to-short package is proposed for SiC devices. Its manufacturing process is described. 4 modules are built and submitted to intense short circuit currents (up to 2000 A). It is found that they offer a stable short-circuit failure mode, providing that the modules are mechanically clamped to prevent separation during the surge current test.
