A resonant modular multilevel Direct Current, DC, converter, R-MMDC as well as a method of operating such an R-MMDC.

Abstract

A B S T R A C T A resonant modular multilevel Direct Current, DC, converter, R-MMDC, arranged for transferring power from a primary side to a secondary side, the converter comprising a transformer connected between the primary side and the secondary side, a resonant circuit, provided at the primary side, and comprising an inductance and a resonant capacitance, wherein the resonant circuit is tuned to a resonant frequency, at least two upper arms, each connected to a positive terminal of a DC power source at the primary side, and at least two lower arms, each connected to a negative terminal of the DC power source at the primary side, wherein midpoints of the at least two upper arms and the at least two lower arms are connected to different terminals of the transformer.