Dc Voltage Droop Control In Mtdc Systems With Grid-Forming Converters and Enhanced Large Transient Behavior Using A Virtual Power Approach

Multi-terminal HVDC (MTDC) grids are gaining increasing attention for their potential to support renewable integration and enhance the flexibility and reliability of power transfer. Within such systems, grid-forming (GFM) converters are crucial for stable synchronisation and supporting converterdominated grids. Their integration, however, requires embedding DC voltage control functionality within the GFM control scheme. This paper proposes a droop-based GFM control strategy enabling multiple converters to share DC voltage control while preserving grid-forming behaviour. Moreover, to address large disturbance challenges within MTDC systems, a virtual powerbased current limitation method is adapted for DC voltagecontrolled GFMs, improving fault ride-through and post-fault resynchronisation. Electromagnetic transient simulations on a modular multilevel converter (MMC) based MTDC network confirm improved stability under power variations, phase jumps, and severe AC faults.