Ultrafast Grid Impedance Identification in $dq$-Asymmetric Three-Phase Power Systems Article Swipe

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Mohamed Abdalmoaty , Verena Häberle , Xiuqiang He , Florian Dörfler ·

YOU? · · 2025 · Open Access · · DOI: https://doi.org/10.48550/arxiv.2510.12338

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.

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Type: preprint
Language: en
Landing Page: http://arxiv.org/abs/2510.12338
PDF: https://arxiv.org/pdf/2510.12338
OA Status: green
OpenAlex ID: https://openalex.org/W4415269901

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OpenAlex ID: https://openalex.org/W4415269901

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DOI: https://doi.org/10.48550/arxiv.2510.12338

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Title: Ultrafast Grid Impedance Identification in $dq$-Asymmetric Three-Phase Power Systems

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Type: preprint

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Language: en

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Publication year: 2025

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Publication date: 2025-10-14

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Authors: Mohamed Abdalmoaty, Verena Häberle, Xiuqiang He, Florian Dörfler

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Landing page: https://arxiv.org/abs/2510.12338

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PDF URL: https://arxiv.org/pdf/2510.12338

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Cited by: 0

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