A Novel Stability Improvement Strategy for a Multi-Inverter System in a Weak Grid Utilizing Dual-Mode Control
Due to the increasing penetration of distributed generations (DGS) and non-negligible grid impedance, the instability problem of the multi-inverter system operating in current source mode (CSM) is becoming serious. In this paper, a closed-loop transfer function model of such a multi-inverter system...
| Main Authors: | , , |
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| Format: | Article |
| Language: | English |
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MDPI AG
2018-08-01
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| Series: | Energies |
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| Online Access: | http://www.mdpi.com/1996-1073/11/8/2144 |
| _version_ | 1798006723864166400 |
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| author | Ming Li Xing Zhang Wei Zhao |
| author_facet | Ming Li Xing Zhang Wei Zhao |
| author_sort | Ming Li |
| collection | DOAJ |
| description | Due to the increasing penetration of distributed generations (DGS) and non-negligible grid impedance, the instability problem of the multi-inverter system operating in current source mode (CSM) is becoming serious. In this paper, a closed-loop transfer function model of such a multi-inverter system is established, by which it is concluded that output current resonance will occur with the increase in the grid impedance. In order to address this problem, this paper presents a novel dual-mode control scheme of multiple inverters: one inverter operating in CSM will be alternated into voltage source mode (VSM) if the grid impedance is high. It is theoretically proved that the coupling between the inverters and the resonance in the output current can be suppressed effectively with the proposed scheme. Finally, the validity of the proposed theory is demonstrated by extensive simulations and experiments. |
| first_indexed | 2024-04-11T13:00:15Z |
| format | Article |
| id | doaj.art-3eb9f7fa38604f14822e172323b1cc4e |
| institution | Directory Open Access Journal |
| issn | 1996-1073 |
| language | English |
| last_indexed | 2024-04-11T13:00:15Z |
| publishDate | 2018-08-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Energies |
| spelling | doaj.art-3eb9f7fa38604f14822e172323b1cc4e2022-12-22T04:22:58ZengMDPI AGEnergies1996-10732018-08-01118214410.3390/en11082144en11082144A Novel Stability Improvement Strategy for a Multi-Inverter System in a Weak Grid Utilizing Dual-Mode ControlMing Li0Xing Zhang1Wei Zhao2School of Electrical Engineering and Automation, Hefei University of Technology, Hefei 230009, ChinaSchool of Electrical Engineering and Automation, Hefei University of Technology, Hefei 230009, ChinaSungrow Power Supply Co., Ltd., Hefei 230088, ChinaDue to the increasing penetration of distributed generations (DGS) and non-negligible grid impedance, the instability problem of the multi-inverter system operating in current source mode (CSM) is becoming serious. In this paper, a closed-loop transfer function model of such a multi-inverter system is established, by which it is concluded that output current resonance will occur with the increase in the grid impedance. In order to address this problem, this paper presents a novel dual-mode control scheme of multiple inverters: one inverter operating in CSM will be alternated into voltage source mode (VSM) if the grid impedance is high. It is theoretically proved that the coupling between the inverters and the resonance in the output current can be suppressed effectively with the proposed scheme. Finally, the validity of the proposed theory is demonstrated by extensive simulations and experiments.http://www.mdpi.com/1996-1073/11/8/2144current source mode (CSM)distributed generationsgrid-connected invertergrid impedancemulti-inverter systemvoltage source mode (VSM)weak grid |
| spellingShingle | Ming Li Xing Zhang Wei Zhao A Novel Stability Improvement Strategy for a Multi-Inverter System in a Weak Grid Utilizing Dual-Mode Control Energies current source mode (CSM) distributed generations grid-connected inverter grid impedance multi-inverter system voltage source mode (VSM) weak grid |
| title | A Novel Stability Improvement Strategy for a Multi-Inverter System in a Weak Grid Utilizing Dual-Mode Control |
| title_full | A Novel Stability Improvement Strategy for a Multi-Inverter System in a Weak Grid Utilizing Dual-Mode Control |
| title_fullStr | A Novel Stability Improvement Strategy for a Multi-Inverter System in a Weak Grid Utilizing Dual-Mode Control |
| title_full_unstemmed | A Novel Stability Improvement Strategy for a Multi-Inverter System in a Weak Grid Utilizing Dual-Mode Control |
| title_short | A Novel Stability Improvement Strategy for a Multi-Inverter System in a Weak Grid Utilizing Dual-Mode Control |
| title_sort | novel stability improvement strategy for a multi inverter system in a weak grid utilizing dual mode control |
| topic | current source mode (CSM) distributed generations grid-connected inverter grid impedance multi-inverter system voltage source mode (VSM) weak grid |
| url | http://www.mdpi.com/1996-1073/11/8/2144 |
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