Impact of FRT Container Dimensioning on Ideal Sources and Converter Controls

This work investigates the influence of fault ride-through (FRT) test setup on the performance of ideal sources and converter controls. The dimensioning of the FRT container determines not only the voltage magnitude drop but also the resulting phase angle jump. This significantly influences not only the new steady-state but also the inherent transient response, which can lead to different assessments of grid code compliance. The inherent fault responses of ideal current and voltage sources are used as references for the sub-transient response of converter controls. Grid-following (GFL) and gridforming (GFM) controls show comparable steady-state solutions but distinct transient dynamics. The study highlights the need for more precise grid code specifications and assessment methods from a grid perspective.