I. Introduction
The development of renewable energy sources and a general stimulus towards higher efficiency has increased the importance of the power electronics for electrical grid applications. In this context, the smart transformer (ST) [1] is a promising technology for the interface between medium- and low-voltage grids, which allows increasing the grid services, ultimately addressing the grid voltage stability and enabling the integration of dc loads [2]. In addition to the mains-connected application, power electronics is being extensively adopted in the areas of energy transmission [3] and the transportation electrification of large vehicles [4]–[7].