We propose a non-parametric frequency-domain method to identify small-signal dq-asymmetric grid impedances, over a wide frequency band, using grid-connected converters. Existing identification methods are faced with significant trade-offs: e.g., passive approaches rely on ambient harmonics and rare grid events and thus can only provide estimates at a few frequencies, while many active approaches that intentionally perturb grid operation require long time series measurement and specialized equipment. Although active time-domain methods reduce the measurement time, they either make crude simplifying assumptions or require laborious model order tuning. Our approach effectively addresses these challenges: it does not require specialized excitation signals or hardware and achieves ultrafast (<1 s) identification, drastically reducing measurement time. Being non-parametric, our approach also makes no assumptions on the grid structure. A detailed electromagnetic transient simulation is used to validate the method and demonstrate its clear superiority over existing alternatives.
@article{arxiv.2510.12338,
title = {Ultrafast Grid Impedance Identification in $dq$-Asymmetric Three-Phase Power Systems},
author = {Mohamed Abdalmoaty and Verena Häberle and Xiuqiang He and Florian Dörfler},
journal= {arXiv preprint arXiv:2510.12338},
year = {2025}
}