Control strategy for seamless switching of virtual synchronous generators based on secondary frequency and voltage regulation
In microgrid, virtual synchronous generators can enhance the system stability by simulating the operation mechanism of synchronous generators. However, a large impact current could be triggered during the grid-access of VSG inverters, resulting in switching failure. Aiming at this problem, based on...
| Main Authors: | , , , |
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| Format: | Article |
| Language: | English |
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Elsevier
2022-12-01
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| Series: | Alexandria Engineering Journal |
| Subjects: | |
| Online Access: | http://www.sciencedirect.com/science/article/pii/S1110016822002320 |
| _version_ | 1797978810185940992 |
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| author | Hua Li Keqilao Meng Yufei Peng Xiaoyan Li |
| author_facet | Hua Li Keqilao Meng Yufei Peng Xiaoyan Li |
| author_sort | Hua Li |
| collection | DOAJ |
| description | In microgrid, virtual synchronous generators can enhance the system stability by simulating the operation mechanism of synchronous generators. However, a large impact current could be triggered during the grid-access of VSG inverters, resulting in switching failure. Aiming at this problem, based on real-time digital simulator (RTDS), this paper proposes a complete and simple pre-synchronization control strategy based on secondary frequency modulation and voltage regulation. Firstly, the grid-access structure of VSG was defined, and a mathematical model of VSG was constructed, followed by the design of power-frequency and excitation regulators. Next, secondary frequency and voltage regulation was performed on the microgrid in islanded mode to eliminate the frequency and voltage bias induced by load changes. On this basis, the grid phase was collected by phase-locked loop, the phases were synchronized through phase difference detection, and the grid-access synchronization was completed, realizing the seamless switching between islanded and grid-connected modes. Compared with the universality of applying matlab simulation software, real-time digital simulator (RTDS) has great advantages compared with physical simulation and general simulation software. Finally, the proposed strategy was proved effective with a self-designed RTDS simulation model. |
| first_indexed | 2024-04-11T05:29:25Z |
| format | Article |
| id | doaj.art-8be9bbeae1c14c63b39d8570e4746430 |
| institution | Directory Open Access Journal |
| issn | 1110-0168 |
| language | English |
| last_indexed | 2024-04-11T05:29:25Z |
| publishDate | 2022-12-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Alexandria Engineering Journal |
| spelling | doaj.art-8be9bbeae1c14c63b39d8570e47464302022-12-23T04:38:16ZengElsevierAlexandria Engineering Journal1110-01682022-12-0161121047710484Control strategy for seamless switching of virtual synchronous generators based on secondary frequency and voltage regulationHua Li0Keqilao Meng1Yufei Peng2Xiaoyan Li3School of Energy and Power Engineering, Inner Mongolia University of Technology, Hohhot 010051, China; Corresponding author.School of Energy and Power Engineering, Inner Mongolia University of Technology, Hohhot 010051, ChinaSchool of Electric Power, Inner Mongolia University of Technology, Hohhot 010051, ChinaSchool of Electric Power, Inner Mongolia University of Technology, Hohhot 010051, ChinaIn microgrid, virtual synchronous generators can enhance the system stability by simulating the operation mechanism of synchronous generators. However, a large impact current could be triggered during the grid-access of VSG inverters, resulting in switching failure. Aiming at this problem, based on real-time digital simulator (RTDS), this paper proposes a complete and simple pre-synchronization control strategy based on secondary frequency modulation and voltage regulation. Firstly, the grid-access structure of VSG was defined, and a mathematical model of VSG was constructed, followed by the design of power-frequency and excitation regulators. Next, secondary frequency and voltage regulation was performed on the microgrid in islanded mode to eliminate the frequency and voltage bias induced by load changes. On this basis, the grid phase was collected by phase-locked loop, the phases were synchronized through phase difference detection, and the grid-access synchronization was completed, realizing the seamless switching between islanded and grid-connected modes. Compared with the universality of applying matlab simulation software, real-time digital simulator (RTDS) has great advantages compared with physical simulation and general simulation software. Finally, the proposed strategy was proved effective with a self-designed RTDS simulation model.http://www.sciencedirect.com/science/article/pii/S1110016822002320Virtual synchronous generators (VSGs)Pre-synchronizationSecondary frequency and voltage regulationPhase synchronizationSeamless switching |
| spellingShingle | Hua Li Keqilao Meng Yufei Peng Xiaoyan Li Control strategy for seamless switching of virtual synchronous generators based on secondary frequency and voltage regulation Alexandria Engineering Journal Virtual synchronous generators (VSGs) Pre-synchronization Secondary frequency and voltage regulation Phase synchronization Seamless switching |
| title | Control strategy for seamless switching of virtual synchronous generators based on secondary frequency and voltage regulation |
| title_full | Control strategy for seamless switching of virtual synchronous generators based on secondary frequency and voltage regulation |
| title_fullStr | Control strategy for seamless switching of virtual synchronous generators based on secondary frequency and voltage regulation |
| title_full_unstemmed | Control strategy for seamless switching of virtual synchronous generators based on secondary frequency and voltage regulation |
| title_short | Control strategy for seamless switching of virtual synchronous generators based on secondary frequency and voltage regulation |
| title_sort | control strategy for seamless switching of virtual synchronous generators based on secondary frequency and voltage regulation |
| topic | Virtual synchronous generators (VSGs) Pre-synchronization Secondary frequency and voltage regulation Phase synchronization Seamless switching |
| url | http://www.sciencedirect.com/science/article/pii/S1110016822002320 |
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