Modular multilevel converter with DC fault protection

摘要

A power conversion device (102) includes at least two legs (104R, 104S, 104T) connected in parallel each of which includes at least two unit converters (106RPc, 106RPf) connected in series, wherein at least one of the legs is formed using at least two kinds of unit converters including a first type unit converter capable of outputting a unipolar voltage and a second type unit converter capable of outputting a bipolar voltage.