Transient power equalization control strategy of virtual synchronous generator in isolated island microgrid with heterogeneous power supply
Abstract In the parallel supply system of synchronous generator and virtual synchronous generator, the physical structure and control structure of the two kinds of power supply are quite different, and it is difficult to distribute the transient power of the two kinds of power supply evenly when the...
| Main Authors: | , , , |
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| Format: | Article |
| Language: | English |
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Nature Portfolio
2023-08-01
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| Series: | Scientific Reports |
| Online Access: | https://doi.org/10.1038/s41598-023-39121-6 |
| _version_ | 1797559745217822720 |
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| author | Changwei Gao Yongchang Sun Weiqiang Zheng Wei Wang |
| author_facet | Changwei Gao Yongchang Sun Weiqiang Zheng Wei Wang |
| author_sort | Changwei Gao |
| collection | DOAJ |
| description | Abstract In the parallel supply system of synchronous generator and virtual synchronous generator, the physical structure and control structure of the two kinds of power supply are quite different, and it is difficult to distribute the transient power of the two kinds of power supply evenly when the load changes abruptly. Especially in the case of sudden load increase, virtual synchronous generator bears too much load in the transient process because of its fast adjustment speed, and even causes short-term overload, which makes the capacity of virtual synchronous generator can not be fully utilized. In view of this problem, firstly, the mechanism of transient power uneven distribution of two heterogeneous power sources is explained from the differences of frequency modulation, voltage regulation and output impedance. Secondly, virtual speed regulation, virtual excitation and dynamic virtual impedance are added to the traditional virtual synchronous generator control to simulate the speed regulation characteristics and electromagnetic transient characteristics of the synchronous generator, so as to realize the transient and steady-state power equalization between heterogeneous power supplies when the virtual synchronous generator and the synchronous generator run in parallel. Thirdly, in order to ensure the fast dynamic response characteristics of the virtual synchronous generator in independent operation mode, the traditional virtual synchronous generator control algorithm is still maintained in independent operation mode, and the mode switching control link based on state tracking is designed to realize smooth switching between the two working modes. Finally, the hardware in loop experiment results based on RT-LAB show that the proposed control method can realize the transient and steady-state power equalization when the virtual synchronous generator and the synchronous generator operate in parallel, it can keep the fast voltage regulation and frequency modulation ability when the virtual synchronous generator operates independently, and can realize smooth switching between independent and parallel operation modes. |
| first_indexed | 2024-03-10T17:49:40Z |
| format | Article |
| id | doaj.art-350faaa082bf45c9832ece8827e9a7b8 |
| institution | Directory Open Access Journal |
| issn | 2045-2322 |
| language | English |
| last_indexed | 2024-03-10T17:49:40Z |
| publishDate | 2023-08-01 |
| publisher | Nature Portfolio |
| record_format | Article |
| series | Scientific Reports |
| spelling | doaj.art-350faaa082bf45c9832ece8827e9a7b82023-11-20T09:23:25ZengNature PortfolioScientific Reports2045-23222023-08-0113111410.1038/s41598-023-39121-6Transient power equalization control strategy of virtual synchronous generator in isolated island microgrid with heterogeneous power supplyChangwei Gao0Yongchang Sun1Weiqiang Zheng2Wei Wang3College of Electrical and Automation Engineering, Liaoning Institute of Science and TechnologyDalian Economic and Technological Development Zone Heat Supply Co., LTDYingkou Power Supply CompanyCollege of Electrical and Automation Engineering, Liaoning Institute of Science and TechnologyAbstract In the parallel supply system of synchronous generator and virtual synchronous generator, the physical structure and control structure of the two kinds of power supply are quite different, and it is difficult to distribute the transient power of the two kinds of power supply evenly when the load changes abruptly. Especially in the case of sudden load increase, virtual synchronous generator bears too much load in the transient process because of its fast adjustment speed, and even causes short-term overload, which makes the capacity of virtual synchronous generator can not be fully utilized. In view of this problem, firstly, the mechanism of transient power uneven distribution of two heterogeneous power sources is explained from the differences of frequency modulation, voltage regulation and output impedance. Secondly, virtual speed regulation, virtual excitation and dynamic virtual impedance are added to the traditional virtual synchronous generator control to simulate the speed regulation characteristics and electromagnetic transient characteristics of the synchronous generator, so as to realize the transient and steady-state power equalization between heterogeneous power supplies when the virtual synchronous generator and the synchronous generator run in parallel. Thirdly, in order to ensure the fast dynamic response characteristics of the virtual synchronous generator in independent operation mode, the traditional virtual synchronous generator control algorithm is still maintained in independent operation mode, and the mode switching control link based on state tracking is designed to realize smooth switching between the two working modes. Finally, the hardware in loop experiment results based on RT-LAB show that the proposed control method can realize the transient and steady-state power equalization when the virtual synchronous generator and the synchronous generator operate in parallel, it can keep the fast voltage regulation and frequency modulation ability when the virtual synchronous generator operates independently, and can realize smooth switching between independent and parallel operation modes.https://doi.org/10.1038/s41598-023-39121-6 |
| spellingShingle | Changwei Gao Yongchang Sun Weiqiang Zheng Wei Wang Transient power equalization control strategy of virtual synchronous generator in isolated island microgrid with heterogeneous power supply Scientific Reports |
| title | Transient power equalization control strategy of virtual synchronous generator in isolated island microgrid with heterogeneous power supply |
| title_full | Transient power equalization control strategy of virtual synchronous generator in isolated island microgrid with heterogeneous power supply |
| title_fullStr | Transient power equalization control strategy of virtual synchronous generator in isolated island microgrid with heterogeneous power supply |
| title_full_unstemmed | Transient power equalization control strategy of virtual synchronous generator in isolated island microgrid with heterogeneous power supply |
| title_short | Transient power equalization control strategy of virtual synchronous generator in isolated island microgrid with heterogeneous power supply |
| title_sort | transient power equalization control strategy of virtual synchronous generator in isolated island microgrid with heterogeneous power supply |
| url | https://doi.org/10.1038/s41598-023-39121-6 |
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