| Abstract |
Modular multi-level converters (MMC) are considered a promising topology for HV applications likeHVDC transmission systems. Such systems must be designed to provide high reliability against differenttypes of faults. MMCs using Half-Bridge (HF) cells are well known for lacking the capability to blockshort circuits in the DC link. On the contrary, Full-Bridge (FB) cells can block the short circuit currentin the DC link, they also enable the implementation of Fault Ride-through (FRT) functionalities, as thecells can generate bipolar voltages in this case. This paper presents a DC short circuit fault ride-throughstrategy for HVDC transmission system using an MMC topology with FB cells (FBMMC). Two modesof operation are possible during the fault. In the _rst one, the MMC can support the AC grid with reactivepower, but will not transfer active power. In the second mode, the MMC can transfer active power duringthe fault. |
