A Current Control Method for Grid-Connected Inverters
It is simple to implement conventional current control with a proportional integral (PI) controller. However, system stability and dynamic performance are not perfect, particularly when operating under unfavorable conditions. In this paper, an improved control method is proposed by introducing a com...
| Main Authors: | , , , , |
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| Format: | Article |
| Language: | English |
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MDPI AG
2023-09-01
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| Series: | Energies |
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| Online Access: | https://www.mdpi.com/1996-1073/16/18/6558 |
| _version_ | 1797580408792023040 |
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| author | Wenping Zhang Yiming Wang Po Xu Donghui Li Baosong Liu |
| author_facet | Wenping Zhang Yiming Wang Po Xu Donghui Li Baosong Liu |
| author_sort | Wenping Zhang |
| collection | DOAJ |
| description | It is simple to implement conventional current control with a proportional integral (PI) controller. However, system stability and dynamic performance are not perfect, particularly when operating under unfavorable conditions. In this paper, an improved control method is proposed by introducing a compensation unit. The compensation unit can effectively compensate the system’s phase around the crossover frequency, greatly enhancing the system’s phase margin and stability. It is also capable of handling weak-grid conditions. In this paper, the concept of the proposed compensation unit is explained first. Then, the corresponding mathematical model for the current control loop is built, and system bode diagrams for the conventional and proposed methods are compared. Furthermore, the effect of the parameters for the compensation unit is investigated, and an optimization method is proposed to determine optimal parameters. In addition, to handle weak-grid conditions, the proposed scheme is expanded by including the compensation unit in the grid’s feed-forward loop. Finally, an experimental platform is constructed, and the experimental results are presented to validate the proposed method. |
| first_indexed | 2024-03-10T22:49:35Z |
| format | Article |
| id | doaj.art-be0c8db53eb840899bb03ac52c9c4bc6 |
| institution | Directory Open Access Journal |
| issn | 1996-1073 |
| language | English |
| last_indexed | 2024-03-10T22:49:35Z |
| publishDate | 2023-09-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Energies |
| spelling | doaj.art-be0c8db53eb840899bb03ac52c9c4bc62023-11-19T10:26:52ZengMDPI AGEnergies1996-10732023-09-011618655810.3390/en16186558A Current Control Method for Grid-Connected InvertersWenping Zhang0Yiming Wang1Po Xu2Donghui Li3Baosong Liu4Department of Electrical and Information Engineering, Tianjin University, Tianjin 300072, ChinaResearch Center, Ginlong Technologies Co., Ltd., Ningbo 315712, ChinaResearch Center, Ginlong Technologies Co., Ltd., Ningbo 315712, ChinaDepartment of Electrical and Information Engineering, Tianjin University, Tianjin 300072, ChinaResearch Center, Ginlong Technologies Co., Ltd., Ningbo 315712, ChinaIt is simple to implement conventional current control with a proportional integral (PI) controller. However, system stability and dynamic performance are not perfect, particularly when operating under unfavorable conditions. In this paper, an improved control method is proposed by introducing a compensation unit. The compensation unit can effectively compensate the system’s phase around the crossover frequency, greatly enhancing the system’s phase margin and stability. It is also capable of handling weak-grid conditions. In this paper, the concept of the proposed compensation unit is explained first. Then, the corresponding mathematical model for the current control loop is built, and system bode diagrams for the conventional and proposed methods are compared. Furthermore, the effect of the parameters for the compensation unit is investigated, and an optimization method is proposed to determine optimal parameters. In addition, to handle weak-grid conditions, the proposed scheme is expanded by including the compensation unit in the grid’s feed-forward loop. Finally, an experimental platform is constructed, and the experimental results are presented to validate the proposed method.https://www.mdpi.com/1996-1073/16/18/6558current controlgrid-connected invertersstabilityPI controller |
| spellingShingle | Wenping Zhang Yiming Wang Po Xu Donghui Li Baosong Liu A Current Control Method for Grid-Connected Inverters Energies current control grid-connected inverters stability PI controller |
| title | A Current Control Method for Grid-Connected Inverters |
| title_full | A Current Control Method for Grid-Connected Inverters |
| title_fullStr | A Current Control Method for Grid-Connected Inverters |
| title_full_unstemmed | A Current Control Method for Grid-Connected Inverters |
| title_short | A Current Control Method for Grid-Connected Inverters |
| title_sort | current control method for grid connected inverters |
| topic | current control grid-connected inverters stability PI controller |
| url | https://www.mdpi.com/1996-1073/16/18/6558 |
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