Analysis of transient characteristics and fault ride-through control of hybrid grid-tied converters with grid-following and grid-forming
When the Grid-Following (GFL) and the Grid-Forming (GFM) converters are hybrid-connected to the grid, they are coupled through the grid impedance. During grid faults, the transient characteristics of the two converters become more complex due to this coupling. If one of the converters experiences st...
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| Format: | Article |
| Language: | English |
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Frontiers Media S.A.
2025-01-01
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| Series: | Frontiers in Energy Research |
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| Online Access: | https://www.frontiersin.org/articles/10.3389/fenrg.2024.1517505/full |
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| author | Baoyu Zhai Shuchao Liang Zhi Xu Fengyi Deng Junru Chen Haiyang Wu |
| author_facet | Baoyu Zhai Shuchao Liang Zhi Xu Fengyi Deng Junru Chen Haiyang Wu |
| author_sort | Baoyu Zhai |
| collection | DOAJ |
| description | When the Grid-Following (GFL) and the Grid-Forming (GFM) converters are hybrid-connected to the grid, they are coupled through the grid impedance. During grid faults, the transient characteristics of the two converters become more complex due to this coupling. If one of the converters experiences stability issues, it affects the other, making fault ride-through challenging. A mathematical model for the hybrid grid-connected system of the two converters is first established to analyze the existence conditions of the equilibrium point. Using the phase-plane method, the mutual influence mechanism during faults is revealed. Subsequently, a method to adjust the GFM phase angle based on the degree of voltage sag is proposed, which also improves the phase-locked loop (PLL) of the GFL. The influence of GFL current injection is considered to limit the GFM fault current, thereby achieving hybrid fault ride-through control. Finally, the simulation verifies the effectiveness of the proposed control strategy. The results show that the proposed method can adjust the phase angle to support the grid, ensuring that the GFM outputs more reactive current within the maximum allowable current range. Meanwhile, the GFL injects current according to grid guidelines, effectively preventing overcurrent and phase angle instability of the converters. |
| format | Article |
| id | doaj-art-998da3b1b9c2431faed8e5361f11a4e6 |
| institution | Kabale University |
| issn | 2296-598X |
| language | English |
| publishDate | 2025-01-01 |
| publisher | Frontiers Media S.A. |
| record_format | Article |
| series | Frontiers in Energy Research |
| spelling | doaj-art-998da3b1b9c2431faed8e5361f11a4e62025-01-20T15:35:45ZengFrontiers Media S.A.Frontiers in Energy Research2296-598X2025-01-011210.3389/fenrg.2024.15175051517505Analysis of transient characteristics and fault ride-through control of hybrid grid-tied converters with grid-following and grid-formingBaoyu Zhai0Shuchao Liang1Zhi Xu2Fengyi Deng3Junru Chen4Haiyang Wu5Electric Power Research Institute of State Grid Xinjiang Electric Power Co., Ltd., Urumqi, Xinjiang, ChinaElectric Power Research Institute of State Grid Xinjiang Electric Power Co., Ltd., Urumqi, Xinjiang, ChinaElectric Power Research Institute of State Grid Xinjiang Electric Power Co., Ltd., Urumqi, Xinjiang, ChinaDepartment of Electrical Engineering, Xinjiang University, Urumqi, Xinjiang, ChinaDepartment of Electrical Engineering, Xinjiang University, Urumqi, Xinjiang, ChinaElectric Power Research Institute of State Grid Xinjiang Electric Power Co., Ltd., Urumqi, Xinjiang, ChinaWhen the Grid-Following (GFL) and the Grid-Forming (GFM) converters are hybrid-connected to the grid, they are coupled through the grid impedance. During grid faults, the transient characteristics of the two converters become more complex due to this coupling. If one of the converters experiences stability issues, it affects the other, making fault ride-through challenging. A mathematical model for the hybrid grid-connected system of the two converters is first established to analyze the existence conditions of the equilibrium point. Using the phase-plane method, the mutual influence mechanism during faults is revealed. Subsequently, a method to adjust the GFM phase angle based on the degree of voltage sag is proposed, which also improves the phase-locked loop (PLL) of the GFL. The influence of GFL current injection is considered to limit the GFM fault current, thereby achieving hybrid fault ride-through control. Finally, the simulation verifies the effectiveness of the proposed control strategy. The results show that the proposed method can adjust the phase angle to support the grid, ensuring that the GFM outputs more reactive current within the maximum allowable current range. Meanwhile, the GFL injects current according to grid guidelines, effectively preventing overcurrent and phase angle instability of the converters.https://www.frontiersin.org/articles/10.3389/fenrg.2024.1517505/fullgrid-following convertergrid-forming converterhybrid grid-connected systemstabilityhybrid fault ride-through control |
| spellingShingle | Baoyu Zhai Shuchao Liang Zhi Xu Fengyi Deng Junru Chen Haiyang Wu Analysis of transient characteristics and fault ride-through control of hybrid grid-tied converters with grid-following and grid-forming Frontiers in Energy Research grid-following converter grid-forming converter hybrid grid-connected system stability hybrid fault ride-through control |
| title | Analysis of transient characteristics and fault ride-through control of hybrid grid-tied converters with grid-following and grid-forming |
| title_full | Analysis of transient characteristics and fault ride-through control of hybrid grid-tied converters with grid-following and grid-forming |
| title_fullStr | Analysis of transient characteristics and fault ride-through control of hybrid grid-tied converters with grid-following and grid-forming |
| title_full_unstemmed | Analysis of transient characteristics and fault ride-through control of hybrid grid-tied converters with grid-following and grid-forming |
| title_short | Analysis of transient characteristics and fault ride-through control of hybrid grid-tied converters with grid-following and grid-forming |
| title_sort | analysis of transient characteristics and fault ride through control of hybrid grid tied converters with grid following and grid forming |
| topic | grid-following converter grid-forming converter hybrid grid-connected system stability hybrid fault ride-through control |
| url | https://www.frontiersin.org/articles/10.3389/fenrg.2024.1517505/full |
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