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Grid-forming voltage source converter (GF-VSC) has been identified as the keytechnology for the operation of future converter-dominated power systems. Amongmany other issues, transient stability of this type of power systems remains anopen topic of research because it is still a key limiting factor for stressedpower systems. Previous studies have proposed control strategies for GF-VSC toimprove transient stability of this type of systems by suitablecurrent-limitation algorithms and/or control of active-power injections. As analternative, this paper proposes two fast voltage boosters to improve transientstability of power systems with 100% of GF-VSC-based generation with virtualsynchronous machine (VSM). One control strategy uses local measurements,whereas the other one uses global measurements of the frequency of the centreof inertia (COI). Both strategies improve transient stability of this type ofsystems significantly. The advantage of using fast voltage boosters for thispurpose is that the set points linked to frequency/active-power injection (i.eset points linked to the primary energy source of the VSCs) will not bemodified. Furthermore, strategies such as current-limitation, active-powercontrol and fast voltage controllers for transient stability improvement arecompatible and complementary.

Fast voltage boosters to improve transient stability of power systems with 100% of grid-forming VSC-based generation