Optimal Parameter Design Methodology for Dual Active Bridge Based PET in MVDC System

Abstract

Medium voltage DC (MVDC) system has been receiving more interest nowadays, and dual active bridge (DAB) based input-series-output-parallel (ISOP) power Electronic transformer (PET) is considered to be a suitable choice for its advantages of high flexibility, high modularity, symmetry and soft-switching capabilities. In order to improve the performance of the DAB based PET in MVDC systems, the paper proposes an optimal parameter design methodology for DAB based PET considering the possible extreme situations that may occur in MVDC systems. In the optimization, peak current value is taken as the major optimal target, and the relationship of peak current value and the design parameters are discussed in detail. Simulations are done to validate the feasibility of the methodology.