The transient instability mechanism and stability‐enhanced LVRT control for VSC riding‐through severe grid voltage sag
Abstract As the grid‐connected interface device of wind and photovoltaic power generation, the voltage source converter (VSC) must pass the low voltage ride‐through (LVRT) test. However, existing literature demonstrates that under weak grid conditions, there is a possibility of severe fluctuations i...
| Main Authors: | , , , , , , |
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| Format: | Article |
| Language: | English |
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Wiley
2023-06-01
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| Series: | IET Renewable Power Generation |
| Subjects: | |
| Online Access: | https://doi.org/10.1049/rpg2.12747 |
| _version_ | 1797817280908754944 |
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| author | Huiqiang Sun Xinchun Lin Guangzhou Huang Jiayan Zhang Dan Liu Kezheng Jiang Yong Kang |
| author_facet | Huiqiang Sun Xinchun Lin Guangzhou Huang Jiayan Zhang Dan Liu Kezheng Jiang Yong Kang |
| author_sort | Huiqiang Sun |
| collection | DOAJ |
| description | Abstract As the grid‐connected interface device of wind and photovoltaic power generation, the voltage source converter (VSC) must pass the low voltage ride‐through (LVRT) test. However, existing literature demonstrates that under weak grid conditions, there is a possibility of severe fluctuations in the terminal voltage of VSC during transiting from the pre‐sag normal operation mode to the LVRT mode. Unfortunately, it will make VSC frequently enter and exit LVRT mode. In order to address the tricky problem of transient instability of VSC riding‐through severe grid voltage sag under the weak grid, in this paper, the full‐order large‐signal model of VSC is established first. Then, based on the established model, the analysis indicates VSC will face the risk of losing stability under the weak grid during LVRT due to current transients. By studying the impacts of low short circuit ratio (SCR) on the basin of attraction of the post‐sag equilibrium point, the intrinsic mechanism of VSC losing stability under weak grid conditions is revealed. Moreover, considering that the transient stability is related to the current control, the stability‐enhanced LVRT control ensuring both small‐signal stability and transient stability of VSC during LVRT is proposed. Finally, the correctness of the above theoretical analysis is verified by real‐time simulation |
| first_indexed | 2024-03-13T08:50:50Z |
| format | Article |
| id | doaj.art-49afdd7d9aeb4e6296658869b8204973 |
| institution | Directory Open Access Journal |
| issn | 1752-1416 1752-1424 |
| language | English |
| last_indexed | 2024-03-13T08:50:50Z |
| publishDate | 2023-06-01 |
| publisher | Wiley |
| record_format | Article |
| series | IET Renewable Power Generation |
| spelling | doaj.art-49afdd7d9aeb4e6296658869b82049732023-05-29T12:03:59ZengWileyIET Renewable Power Generation1752-14161752-14242023-06-011782038204910.1049/rpg2.12747The transient instability mechanism and stability‐enhanced LVRT control for VSC riding‐through severe grid voltage sagHuiqiang Sun0Xinchun Lin1Guangzhou Huang2Jiayan Zhang3Dan Liu4Kezheng Jiang5Yong Kang6School of Electrical and Electronic Engineering Huazhong University of Science and Technology Wuhan ChinaSchool of Electrical and Electronic Engineering Huazhong University of Science and Technology Wuhan ChinaSchool of Electrical and Electronic Engineering Huazhong University of Science and Technology Wuhan ChinaSchool of Electrical and Electronic Engineering Huazhong University of Science and Technology Wuhan ChinaState Grid Hubei Electric Power Co., LTD Electric Power Research Institute Wuhan ChinaState Grid Hubei Electric Power Co., LTD Electric Power Research Institute Wuhan ChinaSchool of Electrical and Electronic Engineering Huazhong University of Science and Technology Wuhan ChinaAbstract As the grid‐connected interface device of wind and photovoltaic power generation, the voltage source converter (VSC) must pass the low voltage ride‐through (LVRT) test. However, existing literature demonstrates that under weak grid conditions, there is a possibility of severe fluctuations in the terminal voltage of VSC during transiting from the pre‐sag normal operation mode to the LVRT mode. Unfortunately, it will make VSC frequently enter and exit LVRT mode. In order to address the tricky problem of transient instability of VSC riding‐through severe grid voltage sag under the weak grid, in this paper, the full‐order large‐signal model of VSC is established first. Then, based on the established model, the analysis indicates VSC will face the risk of losing stability under the weak grid during LVRT due to current transients. By studying the impacts of low short circuit ratio (SCR) on the basin of attraction of the post‐sag equilibrium point, the intrinsic mechanism of VSC losing stability under weak grid conditions is revealed. Moreover, considering that the transient stability is related to the current control, the stability‐enhanced LVRT control ensuring both small‐signal stability and transient stability of VSC during LVRT is proposed. Finally, the correctness of the above theoretical analysis is verified by real‐time simulationhttps://doi.org/10.1049/rpg2.12747power generation controlpower system faultspower system transient stabilityrenewable energy power conversionstability criteriavoltage‐source convertors |
| spellingShingle | Huiqiang Sun Xinchun Lin Guangzhou Huang Jiayan Zhang Dan Liu Kezheng Jiang Yong Kang The transient instability mechanism and stability‐enhanced LVRT control for VSC riding‐through severe grid voltage sag IET Renewable Power Generation power generation control power system faults power system transient stability renewable energy power conversion stability criteria voltage‐source convertors |
| title | The transient instability mechanism and stability‐enhanced LVRT control for VSC riding‐through severe grid voltage sag |
| title_full | The transient instability mechanism and stability‐enhanced LVRT control for VSC riding‐through severe grid voltage sag |
| title_fullStr | The transient instability mechanism and stability‐enhanced LVRT control for VSC riding‐through severe grid voltage sag |
| title_full_unstemmed | The transient instability mechanism and stability‐enhanced LVRT control for VSC riding‐through severe grid voltage sag |
| title_short | The transient instability mechanism and stability‐enhanced LVRT control for VSC riding‐through severe grid voltage sag |
| title_sort | transient instability mechanism and stability enhanced lvrt control for vsc riding through severe grid voltage sag |
| topic | power generation control power system faults power system transient stability renewable energy power conversion stability criteria voltage‐source convertors |
| url | https://doi.org/10.1049/rpg2.12747 |
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