Control strategies for multi-frequency power transfer in a smart-transformer-fed low-voltage grid

Smart grids have attracted the attention of the scientific community for years, since the ability to better manage distributed resources in a dynamic grid scenario is of paramount importance. Among the solutions that have been investigated, there is the smart transformer (ST) distribution concept, where an AC/AC power converter substitutes the traditional distribution transformer while enabling additional services. Considering that the ST can generate arbitrary voltage waveforms, power distribution is not restricted anymore to the fundamental frequency, but additional harmonics can be used. This paper analyzes different control possibilities for multi-frequency converters, comparing the results in terms of dynamic performance, control complexity, and communication requirements.