Single Transformer, MMC based MV Power Electronic Traction Transformer

Abstract

To reduce the number of modules and the number of transformers of existing power electronic traction transformers (PETTs), a novel PETT topology based on the principle of the modular multilevel converter (MMC) and the dual active bridge (DAB) is introduced. The paper explains the operation principle of the proposed PETT and compares the PETT to two existing concepts.