Research on Novel Control Strategy for Grid-Connected Inverter Suitable for Wide-Range Grid Impedance Variation
With the higher penetration of renewable energy, the influence of grid equivalent distribution cable impedance on grid-connected inverter stability is attracting increasing attention. In order to suppress the interaction between grid distribution cable impedance and output impedance of the grid-conn...
| Main Authors: | , , , , |
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| Format: | Article |
| Language: | English |
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MDPI AG
2020-04-01
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| Series: | Electronics |
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| Online Access: | https://www.mdpi.com/2079-9292/9/4/623 |
| _version_ | 1797571194704101376 |
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| author | Xiaohuan Wang Yang Liu Xudong Zhang Qingshou Yang Chunjiang Zhang |
| author_facet | Xiaohuan Wang Yang Liu Xudong Zhang Qingshou Yang Chunjiang Zhang |
| author_sort | Xiaohuan Wang |
| collection | DOAJ |
| description | With the higher penetration of renewable energy, the influence of grid equivalent distribution cable impedance on grid-connected inverter stability is attracting increasing attention. In order to suppress the interaction between grid distribution cable impedance and output impedance of the grid-connected system, the active damping strategy is often used. When a capacitive current loop is used, the damping coefficient increases with the grid impedance increasing. However, the excessive damping coefficient will cause the unstable operation of the system. In order to enhance the robustness of the system, a novel control strategy which is suitable for wide-range grid impedance variation is proposed. In this strategy, the capacitor current inner loop is combined with the grid current inner loop, and grid voltage feedforward is included. Since the virtual impedance, active damping and voltage feed-forward are normalized, the changing tendency of the damping coefficient of the grid-current inner loop is opposite to that of capacitor current inner-loop. The overall damping coefficient of the system remains relatively constant when the grid impedance changes, and this effectively suppresses the resonance of the system. In this paper, the method is analyzed and the parameters are designed and optimized. Finally, the simulation and experiment are presented to verify the analysis. |
| first_indexed | 2024-03-10T20:35:54Z |
| format | Article |
| id | doaj.art-7e0913fad6d944ea8c4e271945570fb9 |
| institution | Directory Open Access Journal |
| issn | 2079-9292 |
| language | English |
| last_indexed | 2024-03-10T20:35:54Z |
| publishDate | 2020-04-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Electronics |
| spelling | doaj.art-7e0913fad6d944ea8c4e271945570fb92023-11-19T21:01:42ZengMDPI AGElectronics2079-92922020-04-019462310.3390/electronics9040623Research on Novel Control Strategy for Grid-Connected Inverter Suitable for Wide-Range Grid Impedance VariationXiaohuan Wang0Yang Liu1Xudong Zhang2Qingshou Yang3Chunjiang Zhang4Key Lab of Power Electronics for Energy Conservation and Motor Drive of Hebei Province, College of Electrical Engineering, Yanshan University, Qinhuangdao 066004, ChinaKey Lab of Power Electronics for Energy Conservation and Motor Drive of Hebei Province, College of Electrical Engineering, Yanshan University, Qinhuangdao 066004, ChinaKey Lab of Power Electronics for Energy Conservation and Motor Drive of Hebei Province, College of Electrical Engineering, Yanshan University, Qinhuangdao 066004, ChinaKey Lab of Power Electronics for Energy Conservation and Motor Drive of Hebei Province, College of Electrical Engineering, Yanshan University, Qinhuangdao 066004, ChinaKey Lab of Power Electronics for Energy Conservation and Motor Drive of Hebei Province, College of Electrical Engineering, Yanshan University, Qinhuangdao 066004, ChinaWith the higher penetration of renewable energy, the influence of grid equivalent distribution cable impedance on grid-connected inverter stability is attracting increasing attention. In order to suppress the interaction between grid distribution cable impedance and output impedance of the grid-connected system, the active damping strategy is often used. When a capacitive current loop is used, the damping coefficient increases with the grid impedance increasing. However, the excessive damping coefficient will cause the unstable operation of the system. In order to enhance the robustness of the system, a novel control strategy which is suitable for wide-range grid impedance variation is proposed. In this strategy, the capacitor current inner loop is combined with the grid current inner loop, and grid voltage feedforward is included. Since the virtual impedance, active damping and voltage feed-forward are normalized, the changing tendency of the damping coefficient of the grid-current inner loop is opposite to that of capacitor current inner-loop. The overall damping coefficient of the system remains relatively constant when the grid impedance changes, and this effectively suppresses the resonance of the system. In this paper, the method is analyzed and the parameters are designed and optimized. Finally, the simulation and experiment are presented to verify the analysis.https://www.mdpi.com/2079-9292/9/4/623grid-connected invertergrid impedanceresonance suppressionLCL filteractive damping |
| spellingShingle | Xiaohuan Wang Yang Liu Xudong Zhang Qingshou Yang Chunjiang Zhang Research on Novel Control Strategy for Grid-Connected Inverter Suitable for Wide-Range Grid Impedance Variation Electronics grid-connected inverter grid impedance resonance suppression LCL filter active damping |
| title | Research on Novel Control Strategy for Grid-Connected Inverter Suitable for Wide-Range Grid Impedance Variation |
| title_full | Research on Novel Control Strategy for Grid-Connected Inverter Suitable for Wide-Range Grid Impedance Variation |
| title_fullStr | Research on Novel Control Strategy for Grid-Connected Inverter Suitable for Wide-Range Grid Impedance Variation |
| title_full_unstemmed | Research on Novel Control Strategy for Grid-Connected Inverter Suitable for Wide-Range Grid Impedance Variation |
| title_short | Research on Novel Control Strategy for Grid-Connected Inverter Suitable for Wide-Range Grid Impedance Variation |
| title_sort | research on novel control strategy for grid connected inverter suitable for wide range grid impedance variation |
| topic | grid-connected inverter grid impedance resonance suppression LCL filter active damping |
| url | https://www.mdpi.com/2079-9292/9/4/623 |
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