  Transient stability is a complex phenomenon presented in multi-machine and
multi-converter systems, and it is still considered a key limiting factor for
stressed power systems. The increasing integration of non-synchronous
generation further emphasises the need to address the challenges of improving
the transient stability faced by these power systems. Several studies have
focused on developing control strategies for GFM-VSCs to improve transient
stability. These strategies include the use of current limiting algorithms
and/or control of active/reactive power injections. This paper investigates the
impact of fast voltage boosters (FVBs) and hybrid current limiters (HCLs) on
transient stability of power systems with 100% grid-forming VSC-based
generators. Short-circuit simulations and critical clearing time analysis are
performed to evaluate the effectiveness of HCLs and FVBs in improving transient
stability. The simulation results demonstrate the effectiveness of these
approaches in avoiding the loss of synchronism. This research contributes to
the current studies on transient stability in power systems and provides
valuable insights into the potential of HCLs and FVBs as effective approaches
to improve system stability.
