Coupling Impedance Modeling Analysis of Grid-Connected Inverters Under Three-Phase Voltage Unbalance
Under the condition of asymmetric system voltage, grid-connected inverters exhibit obvious sequence impedance frequency coupling characteristics, which can easily lead to resonance and the misoperation of protection and control devices. Currently, targeted quantitative analyses are insufficient. To...
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| Format: | Article |
| Language: | English |
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MDPI AG
2025-02-01
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| Series: | Energies |
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| Online Access: | https://www.mdpi.com/1996-1073/18/3/743 |
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| _version_ | 1850068501511798784 |
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| author | Yang Liu Haidong Yu Qihang Wu Bin Wang Lisheng Li Wenbin Liu |
| author_facet | Yang Liu Haidong Yu Qihang Wu Bin Wang Lisheng Li Wenbin Liu |
| author_sort | Yang Liu |
| collection | DOAJ |
| description | Under the condition of asymmetric system voltage, grid-connected inverters exhibit obvious sequence impedance frequency coupling characteristics, which can easily lead to resonance and the misoperation of protection and control devices. Currently, targeted quantitative analyses are insufficient. To address this limitation, this paper identifies dominant harmonic pairs and develops an analytical model of an inverter’ second-order admittance under unbalanced grid voltage conditions. Considering the influence of the phase-locked loop and current control loop, the sequence impedance characteristics of a grid-connected inverter were quantitatively analyzed. The simulation results verified the accuracy of the model. The conclusion of the paper provides a foundation for subsequent research on the instability mechanism and oscillation suppression strategy of the grid-connected inverter and grid interconnection system. |
| format | Article |
| id | doaj-art-ff9f627d13434b96afa4e8182bcb9b54 |
| institution | DOAJ |
| issn | 1996-1073 |
| language | English |
| publishDate | 2025-02-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Energies |
| spelling | doaj-art-ff9f627d13434b96afa4e8182bcb9b542025-08-20T02:48:02ZengMDPI AGEnergies1996-10732025-02-0118374310.3390/en18030743Coupling Impedance Modeling Analysis of Grid-Connected Inverters Under Three-Phase Voltage UnbalanceYang Liu0Haidong Yu1Qihang Wu2Bin Wang3Lisheng Li4Wenbin Liu5State Grid Shandong Electric Power Research Institute, Jinan 250003, ChinaState Grid Shandong Electric Power Research Institute, Jinan 250003, ChinaNational Key Laboratory of New Power System Operation and Control, Department of Electrical Engineering Tsinghua University, Beijing 100084, ChinaNational Key Laboratory of New Power System Operation and Control, Department of Electrical Engineering Tsinghua University, Beijing 100084, ChinaState Grid Shandong Electric Power Research Institute, Jinan 250003, ChinaState Grid Shandong Electric Power Research Institute, Jinan 250003, ChinaUnder the condition of asymmetric system voltage, grid-connected inverters exhibit obvious sequence impedance frequency coupling characteristics, which can easily lead to resonance and the misoperation of protection and control devices. Currently, targeted quantitative analyses are insufficient. To address this limitation, this paper identifies dominant harmonic pairs and develops an analytical model of an inverter’ second-order admittance under unbalanced grid voltage conditions. Considering the influence of the phase-locked loop and current control loop, the sequence impedance characteristics of a grid-connected inverter were quantitatively analyzed. The simulation results verified the accuracy of the model. The conclusion of the paper provides a foundation for subsequent research on the instability mechanism and oscillation suppression strategy of the grid-connected inverter and grid interconnection system.https://www.mdpi.com/1996-1073/18/3/743unbalanced three-phase voltagesgrid-connected inverterimpedance modelingfrequency coupling |
| spellingShingle | Yang Liu Haidong Yu Qihang Wu Bin Wang Lisheng Li Wenbin Liu Coupling Impedance Modeling Analysis of Grid-Connected Inverters Under Three-Phase Voltage Unbalance Energies unbalanced three-phase voltages grid-connected inverter impedance modeling frequency coupling |
| title | Coupling Impedance Modeling Analysis of Grid-Connected Inverters Under Three-Phase Voltage Unbalance |
| title_full | Coupling Impedance Modeling Analysis of Grid-Connected Inverters Under Three-Phase Voltage Unbalance |
| title_fullStr | Coupling Impedance Modeling Analysis of Grid-Connected Inverters Under Three-Phase Voltage Unbalance |
| title_full_unstemmed | Coupling Impedance Modeling Analysis of Grid-Connected Inverters Under Three-Phase Voltage Unbalance |
| title_short | Coupling Impedance Modeling Analysis of Grid-Connected Inverters Under Three-Phase Voltage Unbalance |
| title_sort | coupling impedance modeling analysis of grid connected inverters under three phase voltage unbalance |
| topic | unbalanced three-phase voltages grid-connected inverter impedance modeling frequency coupling |
| url | https://www.mdpi.com/1996-1073/18/3/743 |
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