Design of a Medium Frequency High Power Transformer built with thin Grain Oriented Electrical Steel Core
Résumé
The paper addresses the problematic of a medium frequency transformer prototype design using grain oriented electrical steel (GOES) core with the future aim to build a solidstate transformer (SST) for DC grids. SSTs are electronic components using static converters connected at the primary and the secondary sides of a medium or high frequency transformer. This technology enables smart nodes for an active control of power flow within DC grids. In most of the reported cases, SSTs combine amorphous or nanocrystalline magnetic materials for the core and wide-bandgap semiconductors technologies with complex control strategies. This makes those SSTs expensive. The paper suggests another approach for designing low-cost SSTs taking advantage of widespread GOES associated to well-known silicon-based semiconductor converters working with very simple command strategies. The study focuses on a prototype dedicated to answer questions raised by the optimal design of a MFGO transformer
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