ANALYSIS AND PROTECTION SCHEME OF STATION INTERNAL AC GROUNDING FAULTS IN A BIPOLAR MMC-HVDC SYSTEM

The symmetrical bipolar configuration shows a great advantage in modular multilevel converter (MMC) based high-voltage dc-current (HVDC) transmission.In a bipolar MMC-HVDC hot topic guy funko pop system, station internal ac grounding faults cause sub-module (SM) capacitors to discharge violently.These faults do great harm to MMCs and require specia