This digest proposes a new control method for the Grid-Forming (GFM) converter under grid disturbances. Recently, power systems require GFM converters to provide ancillary grid services to facilitate recovery from various disturbances, which is also called GFM capability. However, GFM capability has an inherent adverse effect from the perspective of transient stability. The proposed method in this digest overcomes this trade-off by extra rotation of the internal voltage source (IVS) of GFM converters. Extra rotation is applied simultaneously with the current limitation strategy to improve transient stability while maintaining natural grid service provision ability. Also, the proposed method works effectively regardless of the strength of the power system with various grid disturbances. The validity of the proposed method is verified with experiments by a 3 kW GFM converter system.
