Transient stability enhancement control strategy for droop-controlled voltage source converter
The droop-controlled voltage source converter (VSC) can support the voltage at the point of common coupling (PCC) and realize frequency adjustment by simulating the swing equation of the synchronous generator (SG) and has a higher stability margin in the extremely weak grid. Under large-signal distu...
| Main Authors: | , , , , |
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| Format: | Article |
| Language: | English |
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Elsevier
2022-11-01
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| Series: | Energy Reports |
| Subjects: | |
| Online Access: | http://www.sciencedirect.com/science/article/pii/S2352484722009532 |
| _version_ | 1797947041519763456 |
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| author | Jilei Wang Xing Zhang Qiaohua Zhu Siyu Chen Bo Peng |
| author_facet | Jilei Wang Xing Zhang Qiaohua Zhu Siyu Chen Bo Peng |
| author_sort | Jilei Wang |
| collection | DOAJ |
| description | The droop-controlled voltage source converter (VSC) can support the voltage at the point of common coupling (PCC) and realize frequency adjustment by simulating the swing equation of the synchronous generator (SG) and has a higher stability margin in the extremely weak grid. Under large-signal disturbances such as short-circuit faults in the power grid, the active power output of the VSC decreases, and the continuous increase of the power angle causes the VSC to have a power angle instability similar to that of the SG. In addition, in order to ensure the safety of the equipment, the VSC control system contains a current-limiting strategy, which will cause a large change in the transient external characteristics of the VSC under large-signal disturbances. This paper firstly studies the transient synchronization mechanism between VSC and the power grid under grid faults and expounds on the reasons for the transient instability of VSC with the current limiting strategy. Based on the above analysis, a transient enhancement strategy is proposed to reduce the imbalance of active power and reduce the risk of VSC transient instability. It is worth mentioning that the proposed transient control strategy will not affect the steady-state output characteristics of the VSC. Finally, simulation and experiment verify the effectiveness of the proposed control strategy. |
| first_indexed | 2024-04-10T21:21:33Z |
| format | Article |
| id | doaj.art-40fc7f0a99114399bcf4212a14cea5e9 |
| institution | Directory Open Access Journal |
| issn | 2352-4847 |
| language | English |
| last_indexed | 2024-04-10T21:21:33Z |
| publishDate | 2022-11-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Energy Reports |
| spelling | doaj.art-40fc7f0a99114399bcf4212a14cea5e92023-01-20T04:24:58ZengElsevierEnergy Reports2352-48472022-11-0183544Transient stability enhancement control strategy for droop-controlled voltage source converterJilei Wang0Xing Zhang1Qiaohua Zhu2Siyu Chen3Bo Peng4National and Local Joint Engineering Laboratory for Renewable Energy Access to Grid Technology, Hefei University of Technology, Hefei 230009, China; Corresponding author.National and Local Joint Engineering Laboratory for Renewable Energy Access to Grid Technology, Hefei University of Technology, Hefei 230009, ChinaNational and Local Joint Engineering Laboratory for Renewable Energy Access to Grid Technology, Hefei University of Technology, Hefei 230009, ChinaNational and Local Joint Engineering Laboratory for Renewable Energy Access to Grid Technology, Hefei University of Technology, Hefei 230009, ChinaState Grid Anhui Electric Power Co., Ltd, Hefei 230061, ChinaThe droop-controlled voltage source converter (VSC) can support the voltage at the point of common coupling (PCC) and realize frequency adjustment by simulating the swing equation of the synchronous generator (SG) and has a higher stability margin in the extremely weak grid. Under large-signal disturbances such as short-circuit faults in the power grid, the active power output of the VSC decreases, and the continuous increase of the power angle causes the VSC to have a power angle instability similar to that of the SG. In addition, in order to ensure the safety of the equipment, the VSC control system contains a current-limiting strategy, which will cause a large change in the transient external characteristics of the VSC under large-signal disturbances. This paper firstly studies the transient synchronization mechanism between VSC and the power grid under grid faults and expounds on the reasons for the transient instability of VSC with the current limiting strategy. Based on the above analysis, a transient enhancement strategy is proposed to reduce the imbalance of active power and reduce the risk of VSC transient instability. It is worth mentioning that the proposed transient control strategy will not affect the steady-state output characteristics of the VSC. Finally, simulation and experiment verify the effectiveness of the proposed control strategy.http://www.sciencedirect.com/science/article/pii/S2352484722009532Voltage source converters (VSCs)Grid faultsTransient stabilityCurrent limitation |
| spellingShingle | Jilei Wang Xing Zhang Qiaohua Zhu Siyu Chen Bo Peng Transient stability enhancement control strategy for droop-controlled voltage source converter Energy Reports Voltage source converters (VSCs) Grid faults Transient stability Current limitation |
| title | Transient stability enhancement control strategy for droop-controlled voltage source converter |
| title_full | Transient stability enhancement control strategy for droop-controlled voltage source converter |
| title_fullStr | Transient stability enhancement control strategy for droop-controlled voltage source converter |
| title_full_unstemmed | Transient stability enhancement control strategy for droop-controlled voltage source converter |
| title_short | Transient stability enhancement control strategy for droop-controlled voltage source converter |
| title_sort | transient stability enhancement control strategy for droop controlled voltage source converter |
| topic | Voltage source converters (VSCs) Grid faults Transient stability Current limitation |
| url | http://www.sciencedirect.com/science/article/pii/S2352484722009532 |
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