Saturation-Informed Current-Limiting Control for Grid-Forming Converters
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arXiv
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| Main Authors: | , , , |
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| Format: | Preprint |
| Published: |
2024
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| _version_ | 1866909237736636416 |
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| author | Desai, Maitraya Avadhut He, Xiuqiang Huang, Linbin Dörfler, Florian |
| author_facet | Desai, Maitraya Avadhut He, Xiuqiang Huang, Linbin Dörfler, Florian |
| contents | In this paper, we investigate the transient stability of a state-of-the-art grid-forming complex-droop control (i.e., dispatchable virtual oscillator control, dVOC) under current saturation. We quantify the saturation level of a converter by introducing the concept of degree of saturation (DoS), and we propose a provably stable current-limiting control with saturation-informed feedback, which feeds the degree of saturation back to the inner voltage-control loop and the outer grid-forming loop. As a result, although the output current is saturated, the voltage phase angle can still be generated from an internal virtual voltage-source node that is governed by an equivalent complex-droop control. We prove that the proposed control achieves transient stability during current saturation under grid faults. We also provide parametric stability conditions for multi-converter systems under grid-connected and islanded scenarios. The stability performance of the current-limiting control is validated with various case studies. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2404_07682 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Saturation-Informed Current-Limiting Control for Grid-Forming Converters Desai, Maitraya Avadhut He, Xiuqiang Huang, Linbin Dörfler, Florian Systems and Control In this paper, we investigate the transient stability of a state-of-the-art grid-forming complex-droop control (i.e., dispatchable virtual oscillator control, dVOC) under current saturation. We quantify the saturation level of a converter by introducing the concept of degree of saturation (DoS), and we propose a provably stable current-limiting control with saturation-informed feedback, which feeds the degree of saturation back to the inner voltage-control loop and the outer grid-forming loop. As a result, although the output current is saturated, the voltage phase angle can still be generated from an internal virtual voltage-source node that is governed by an equivalent complex-droop control. We prove that the proposed control achieves transient stability during current saturation under grid faults. We also provide parametric stability conditions for multi-converter systems under grid-connected and islanded scenarios. The stability performance of the current-limiting control is validated with various case studies. |
| title | Saturation-Informed Current-Limiting Control for Grid-Forming Converters |
| topic | Systems and Control |
| url | https://arxiv.org/abs/2404.07682 |