An Argument-Principle Based Stability Assessment Method for Grey-Box DFIG Systems
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arXiv
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| Hauptverfasser: | , , , , |
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| Format: | Preprint |
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2026
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| _version_ | 1866911587865985024 |
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| author | Zhang, Tao Hao, Zhiguo Yang, Songhao Ma, Hongyue Zhang, Baohui |
| author_facet | Zhang, Tao Hao, Zhiguo Yang, Songhao Ma, Hongyue Zhang, Baohui |
| contents | Considerable efforts have been made to analyze the small-signal stability of doubly fed induction generator (DFIG) systems. However, commercial confidentiality and frequency coupling make the DFIG system a grey-box multiple-input-multiple-output (MIMO) system with highly challenging stability analysis. This paper proposes an Argument-principle based stability assessment method to analyze the stability of the grey-box DFIG system. The frequency sweeping technique is first used to acquire the MIMO model of the black-box device, as well as the determinant of the system's return difference matrix. Then a stability criterion based on the determinant trajectory is presented. This criterion applies to the stability analysis of grey-box MIMO systems without detailed system models. Further, acritical-pole estimation method with trajectory information is developed to assess the dominant mode of the target system. The simulation and hardware-in-loop experiment results demonstrate the effectiveness of the proposed method. Finally, some concerns about this method, such as model selection, estimation errors and application potential, are thoroughly analyzed and clarified. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2604_11073 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | An Argument-Principle Based Stability Assessment Method for Grey-Box DFIG Systems Zhang, Tao Hao, Zhiguo Yang, Songhao Ma, Hongyue Zhang, Baohui Systems and Control Considerable efforts have been made to analyze the small-signal stability of doubly fed induction generator (DFIG) systems. However, commercial confidentiality and frequency coupling make the DFIG system a grey-box multiple-input-multiple-output (MIMO) system with highly challenging stability analysis. This paper proposes an Argument-principle based stability assessment method to analyze the stability of the grey-box DFIG system. The frequency sweeping technique is first used to acquire the MIMO model of the black-box device, as well as the determinant of the system's return difference matrix. Then a stability criterion based on the determinant trajectory is presented. This criterion applies to the stability analysis of grey-box MIMO systems without detailed system models. Further, acritical-pole estimation method with trajectory information is developed to assess the dominant mode of the target system. The simulation and hardware-in-loop experiment results demonstrate the effectiveness of the proposed method. Finally, some concerns about this method, such as model selection, estimation errors and application potential, are thoroughly analyzed and clarified. |
| title | An Argument-Principle Based Stability Assessment Method for Grey-Box DFIG Systems |
| topic | Systems and Control |
| url | https://arxiv.org/abs/2604.11073 |