Medium frequency high power transformers, state of art and challenges

The worldwide increasing interests towards medium frequency high power transformers (MFHPTs) as a key element of high power converters in offshore wind farms and traction systems makes it a promising area of research. Since the electrical environment and excitations are different in these applications, conventional transformers are not applicable and hence new design procedures should be utilized. Several prototypes and design procedures have been proposed in recent years to optimize the efficiency and maximize the power density of such transformers. Consequently, in this paper, a review on the status of art, trends and challenges of such transformers is presented in detail. In addition, several potential future works are proposed and addressed completely.