Zhao, XianxianXianxianZhaoFlynn, DamianDamianFlynn2022-08-222022-08-222021-03-02http://hdl.handle.net/10197/13089The 9th Renewable Power Generation Conference (RPG 2021), Dublin, Ireland (held online), 1-2 March 2021Given increasing shares of wind and/or solar power in many power systems, the possibility of a 100% power converter-based system becomes more plausible. Consequently, the dynamic response of the Irish transmission system with 100% (grid-following and grid-forming) power converters under 3-phase faults is investigated. Time domain simulations show that when active or reactive current prioritisation limits are applied, grid-forming converters can introduce large high-frequency oscillations, but a scaling-down current limitation approach can help to avoid such problems. Furthermore, applying scaling-down current limits, together with freezing the virtual angular speed, for a grid-forming converter, can limit the current and enhance transient stability during faults. Finally, with modified controls applied to the grid-following converters, the grid-forming requirement can be reduced from approximately 40% to less than 30%, with the future Irish grid remaining robust against bolted 3-phase faults, and oscillations quickly damped out during and post fault.enDampingPower generation faultsTime-varying networksPower generation controlConference Publication10.1049/icp.2021.13512021-12-1015/IA/3058https://creativecommons.org/licenses/by/3.0/ie/