The augmented trapezoidal alternate arm converter: a power-group augmented DC fault tolerant voltage source converter

Paul D Judge, Michael MC Merlin, Tim C Green, DR Trainer, Konstantin Vershinin

Research output: Chapter in Book/Report/Conference proceedingConference contribution


Achieving DC fault tolerance in modular multilevel converters requires the use of a significant number sub-modules which are capable of generating a negative voltage. This results in an increase in the number of IGBT devices in the current path, resulting in an increase in conduction losses within the converter. This paper introduces a thyristor augmented multilevel structure called a Power-Group, offering both negative voltage capability as well as a low conduction loss state, which can be used to construct high efficiency DC fault tolerant converters. When combined with the Alternate Arm Converter topology the power-group concept has been found to result in a converter topology that exhibits very low power-losses, high quality AC and DC current waveforms, while also achieving DC fault tolerance.
Original languageUndefined/Unknown
Title of host publicationCigré HVDC 2016
Publication statusPublished - 25 Oct 2016

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