Fault resilient high efficiency stacked resonant converters for multi-terminal DC architectures

Next-generation medium and high voltage DC grids are expected to comprise multiple terminals that include generation, loads and interconnections to other networks. DC faults pose a significant challenge to the implementation of multi-terminal DC networks as high voltage DC breakers are complicated in design and will add a large cost and volume to the DC converter station. In this paper, a medium and/or high voltage converter station design is presented based on stacked high frequency isolated resonant based converters. Such converters provide high power density, high efficiency and above all ultra-fast fault isolation capability. Basic design concepts of the converters and experimental verification of the converter operation and fault isolation are presented.