What if the vehicle becomes a pillar of the electric grid? This is the principle of V2G, or vehicle-to-grid, a two-way exchange technology that will soon allow Renault cars to recover part of the electricity stored in the batteries to improve grid operation and compensate for the intermittent nature of renewables. energies.
Sur ce sujet, et pour aller encore plus loin, le CEA, acteur mageur de la recherche, et Renault Group, pionnier and expert in electric electrique, travaillent déjà sur les futures generation of ces V2G technologies who will run the end of the line Contract. Therefore, CEA and Renault Group have developed a new electronic architecture of the transducer (the transducer is an electronic device, which is placed between the source of electrical energy and the supplied load, which makes it possible to adapt the source to charging and control the transfer of energy from one to the other) integrated directly into the car charger . As a result of nearly 3 years of research and being the subject of 11 joint patents, this power adapter developed from innovative materials and more compact will reduce energy loss by 30%, improve vehicle charging and ensure battery durability. Even better, it will be, above all, bi-directional by storing energy coming from the electrical grid.
Innovative materials
The R&D teams at CEA and Renault Group have combined their expertise in on-board power electronics, in particular with regard to so-called “Grand Gap” semiconductor materials, be it Gallium Nitride (GaN) or Silicon Carbide (SiC). The result: a new architecture based on “Grand Gap” components allows for 30% less energy loss during shunting, and with the same amount of heating, facilitating shunting system cooling.
Reduce the size of the charger
In addition, the work of engineers to optimize the active (semiconductors) and passive (capacitors and wound inductive components) made it possible to reduce the volume and cost of the charger. Thanks to the use of ferrite material, intended for high frequency, and an injection molding process called “Power Injection Molding”, the transformer is more compact.
towards better performance
This new inverter architecture provides up to 22kW of charging capacity in three-phase mode, making it possible to charge your vehicle faster while ensuring battery durability. It also allows the charger to be bi-directional, with the energy stored in the battery capable of, for example, being sent back to the grid or used to supply the power needs of an independent home, provided the latter is notably equipped with a bi-directional setup. The solution is EMC compliant for networks and the vehicle.
Jean-François Salesy, Group Renault Director of Advanced Engineering He explains: This project with CEA has exceeded our expectations by confirming the ability to achieve the expected performance in terms of efficiency and compactness. It opens up a strong frontier around power electronics that poses a real challenge in an electric vehicle to make the most of the batteries’ capabilities. With two-way charging, the vehicle is at the service of the electricity grid and allows the end consumer to reduce energy costs.”
We are proud to support the Renault Group in this development. get excited Sebastien Dufy, Director of CEA’s Leti Institute. “We were able to combine the Renault Group’s system vision on the electrification of the vehicle and the power unit, with the skills of our teams in transformer structures and components; in the end, we implemented an architecture that adapts to needs and has a high added value.
“The use of innovative materials with joint patents between Group Renault and CEA on the charger made it possible to manufacture the custom adapter, which is an essential building block in this type of development, as it allows volumes to be reduced with performance that goes beyond the state of the art”Describe François Legland, Director of CEA’s Liten Institute.
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