Resumen
Renewable energy resources and new loads?such as electric vehicles?challenge grid management. Among several scenarios, the smart transformer represents a solution for simultaneously managing low- and medium-voltage grids, providing ancillary services to the distribution grid. However, unlike conventional transformers, the smart transformer has a very limited overload capability, because the junction temperature?which must always be below its maximum limit?is characterized by a short time constant. In this work, an overload control for smart transformer by means of voltage and frequency variations has been proposed and veri?ed by means of simulations and experiments.