Solid-State

A solid-state transformer (SST), power electronic transformer (PET), or electronic power transformer is an AC-to-AC converter, a type of electric power converter that replaces a conventional transformer used in AC electric power distribution. It is more complex than a conventional transformer operating at utility frequency, but can be smaller and more efficient than conventional transformers because it operates at higher frequencies. Solid-state transformers are an emerging technology as of 2025.