Ultrafast Grid Impedance Identification in $dq$-Asymmetric Three-Phase Power Systems
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arXiv
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| Hauptverfasser: | , , , |
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| Format: | Preprint |
| Veröffentlicht: |
2025
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| author | Abdalmoaty, Mohamed Häberle, Verena He, Xiuqiang Dörfler, Florian |
| author_facet | Abdalmoaty, Mohamed Häberle, Verena He, Xiuqiang Dörfler, Florian |
| contents | 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. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2510_12338 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Ultrafast Grid Impedance Identification in $dq$-Asymmetric Three-Phase Power Systems Abdalmoaty, Mohamed Häberle, Verena He, Xiuqiang Dörfler, Florian Systems and Control Signal Processing 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. |
| title | Ultrafast Grid Impedance Identification in $dq$-Asymmetric Three-Phase Power Systems |
| topic | Systems and Control Signal Processing |
| url | https://arxiv.org/abs/2510.12338 |