Research on Hybrid Voltage-Power Switching Control Strategy of Grid-Connected Two-Stage Photovoltaic System for Low Voltage Ride Through Faults
For two-stage grid-connected photovoltaic (PV) system, if the low voltage ride through (LVRT) faults occur in the grid side, because the grid voltage falls to a relative low value and the output current is limited, then the output power of inverter reduces and the dc bus voltage fluctuates, which le...
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IEEE
2025-01-01
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| Online Access: | https://ieeexplore.ieee.org/document/11009208/ |
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| author | Yangyang Wu Tianshu Wen Huayu Yuan Caiqiang Zhang Xiaolong Song Peng Bai Hengshan Xu Dikang Wang Kanghui Li Xianjin Zeng Siwei Wang |
| author_facet | Yangyang Wu Tianshu Wen Huayu Yuan Caiqiang Zhang Xiaolong Song Peng Bai Hengshan Xu Dikang Wang Kanghui Li Xianjin Zeng Siwei Wang |
| author_sort | Yangyang Wu |
| collection | DOAJ |
| description | For two-stage grid-connected photovoltaic (PV) system, if the low voltage ride through (LVRT) faults occur in the grid side, because the grid voltage falls to a relative low value and the output current is limited, then the output power of inverter reduces and the dc bus voltage fluctuates, which leads the instantaneous dc bus voltage higher than the normal voltage and brings overvoltage breakdown risk. To solve the above problem, in this paper, a hybrid voltage-power switching control strategy for two-stage grid-connectedPV systemis proposed. If the grid voltage is normal, the dc-dcstage works in maximum power point tracking (MPPT) mode, and the inverter works in double-loop control (DLC)mode. If the LVRT fault occurs in grid side, the dc-dc stage switches from MPPT mode to voltage control mode, and the inverter switches from DLC mode to single-voltage-loop control (SVL) mode, that is to say, the two stages switch to voltage control mode to stabilize the dc bus voltage. To verify the effectiveness of the proposed hybrid voltage-power switching control strategy, an experiment is conducted based on the RT-LAB real-time platform (OPAL-RT 5707XG simulator with 8 CPU cores and OPAL-RT Linux OS). The experimental results show that the proposed hybrid control strategy can decrease the voltage ripple ratios by about 0.7%, 16.9%, and 70.3% for 80%, 20%, and 5% LVRT faults, respectively. |
| format | Article |
| id | doaj-art-27e44d725b5b43feaf5d8a841e972cb3 |
| institution | Kabale University |
| issn | 2169-3536 |
| language | English |
| publishDate | 2025-01-01 |
| publisher | IEEE |
| record_format | Article |
| series | IEEE Access |
| spelling | doaj-art-27e44d725b5b43feaf5d8a841e972cb32025-08-20T03:28:10ZengIEEEIEEE Access2169-35362025-01-011310902110903310.1109/ACCESS.2025.357274011009208Research on Hybrid Voltage-Power Switching Control Strategy of Grid-Connected Two-Stage Photovoltaic System for Low Voltage Ride Through FaultsYangyang Wu0Tianshu Wen1Huayu Yuan2https://orcid.org/0009-0002-0684-7379Caiqiang Zhang3Xiaolong Song4Peng Bai5Hengshan Xu6https://orcid.org/0000-0002-4166-006XDikang Wang7Kanghui Li8Xianjin Zeng9Siwei Wang10Yunnan Electric Test and Research Institute Group Company Ltd., Kunming, ChinaYunnan Electric Test and Research Institute Group Company Ltd., Kunming, ChinaYunnan Electric Test and Research Institute Group Company Ltd., Kunming, ChinaYunnan Electric Test and Research Institute Group Company Ltd., Kunming, ChinaYunnan Electric Test and Research Institute Group Company Ltd., Kunming, ChinaYunnan Electric Test and Research Institute Group Company Ltd., Kunming, ChinaCollege of Electrical Engineering and New Energy, China Three Gorges University, Yichang, ChinaCollege of Electrical Engineering and New Energy, China Three Gorges University, Yichang, ChinaCollege of Electrical Engineering and New Energy, China Three Gorges University, Yichang, ChinaCollege of Electrical Engineering and New Energy, China Three Gorges University, Yichang, ChinaCollege of Electrical Engineering and New Energy, China Three Gorges University, Yichang, ChinaFor two-stage grid-connected photovoltaic (PV) system, if the low voltage ride through (LVRT) faults occur in the grid side, because the grid voltage falls to a relative low value and the output current is limited, then the output power of inverter reduces and the dc bus voltage fluctuates, which leads the instantaneous dc bus voltage higher than the normal voltage and brings overvoltage breakdown risk. To solve the above problem, in this paper, a hybrid voltage-power switching control strategy for two-stage grid-connectedPV systemis proposed. If the grid voltage is normal, the dc-dcstage works in maximum power point tracking (MPPT) mode, and the inverter works in double-loop control (DLC)mode. If the LVRT fault occurs in grid side, the dc-dc stage switches from MPPT mode to voltage control mode, and the inverter switches from DLC mode to single-voltage-loop control (SVL) mode, that is to say, the two stages switch to voltage control mode to stabilize the dc bus voltage. To verify the effectiveness of the proposed hybrid voltage-power switching control strategy, an experiment is conducted based on the RT-LAB real-time platform (OPAL-RT 5707XG simulator with 8 CPU cores and OPAL-RT Linux OS). The experimental results show that the proposed hybrid control strategy can decrease the voltage ripple ratios by about 0.7%, 16.9%, and 70.3% for 80%, 20%, and 5% LVRT faults, respectively.https://ieeexplore.ieee.org/document/11009208/Two-stagehybrid control strategyphotovoltaicgrid-connectedmaximum power point trackinglow voltage ride through |
| spellingShingle | Yangyang Wu Tianshu Wen Huayu Yuan Caiqiang Zhang Xiaolong Song Peng Bai Hengshan Xu Dikang Wang Kanghui Li Xianjin Zeng Siwei Wang Research on Hybrid Voltage-Power Switching Control Strategy of Grid-Connected Two-Stage Photovoltaic System for Low Voltage Ride Through Faults IEEE Access Two-stage hybrid control strategy photovoltaic grid-connected maximum power point tracking low voltage ride through |
| title | Research on Hybrid Voltage-Power Switching Control Strategy of Grid-Connected Two-Stage Photovoltaic System for Low Voltage Ride Through Faults |
| title_full | Research on Hybrid Voltage-Power Switching Control Strategy of Grid-Connected Two-Stage Photovoltaic System for Low Voltage Ride Through Faults |
| title_fullStr | Research on Hybrid Voltage-Power Switching Control Strategy of Grid-Connected Two-Stage Photovoltaic System for Low Voltage Ride Through Faults |
| title_full_unstemmed | Research on Hybrid Voltage-Power Switching Control Strategy of Grid-Connected Two-Stage Photovoltaic System for Low Voltage Ride Through Faults |
| title_short | Research on Hybrid Voltage-Power Switching Control Strategy of Grid-Connected Two-Stage Photovoltaic System for Low Voltage Ride Through Faults |
| title_sort | research on hybrid voltage power switching control strategy of grid connected two stage photovoltaic system for low voltage ride through faults |
| topic | Two-stage hybrid control strategy photovoltaic grid-connected maximum power point tracking low voltage ride through |
| url | https://ieeexplore.ieee.org/document/11009208/ |
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