DC transformers based on power electronics are key items of equipment for medium voltage
dc (MVDC) distribution systems. Both high and low step-ratio dc-dc conversions are required …

A hybrid dc transformer (DCT) combining the features of modular multilevel converter (MMC)
and series-connected semiconductor switches (SSs) is proposed in this article, which is …

With the vigorous development of offshore wind energy, two-stage voltage step-up HVdc
transmission has become a better choice compared with other transmission methods due to …

Medium voltage dc converters with multiple output ports have the challenges of series input
module power balancing control and fault isolation between output ports. This article …

This paper presents system-level efficiency evaluation of the suitable isolated dc/dc
converters in input-series-output-parallel power electronics transformers (PET) applied for …

All-dc offshore wind power system is a promising solution for long distance and high power
transmission. This paper proposes a series-parallel multiple integrated modular multilevel …

Direct current (Dc) networks have proven advantages in high voltage direct current (HVDC)
transmission systems, and now they are expanding to medium-and low-voltage distribution …

In this paper, we propose a novel full-bridge (FB) diode-clamped four-level symmetric
switching converter. Multi-neighboring reference vector discontinuous PWM (MNRV DPWM) …

The recently proposed modular multilevel dc-dc converter (M2DC) and the HVDC-dc auto
transformer (HVDC-AT) enable direct power transfer between dc networks at low-to …

The dc–dc converter, also termed as dc transformer, plays an important role in the future dc
grids. It is used to interconnect network segments or lines with different voltage levels. A …