Improved Dual Closed-Loop Control for Modular Multilevel Converters Based on Voltage Drop on Grid Impedance
[Objective] As renewable power bases gradually expand from load centers to remote areas such as deep offshore， deserts， and barren lands， using grid-forming voltage source converter-based high voltage direct current （VSC-HVDC） transmission technology is a promising solution for integrating renewable...
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Editorial Department of Electric Power Construction
2025-05-01
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| Series: | Dianli jianshe |
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| Online Access: | https://www.cepc.com.cn/fileup/1000-7229/PDF/1745741294447-897655717.pdf |
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| author | LIU Shan, LIU Qi, ZHU Lin, YAN Jun, CHI Chengbin, SUN Zengjie |
| author_facet | LIU Shan, LIU Qi, ZHU Lin, YAN Jun, CHI Chengbin, SUN Zengjie |
| author_sort | LIU Shan, LIU Qi, ZHU Lin, YAN Jun, CHI Chengbin, SUN Zengjie |
| collection | DOAJ |
| description | [Objective] As renewable power bases gradually expand from load centers to remote areas such as deep offshore， deserts， and barren lands， using grid-forming voltage source converter-based high voltage direct current （VSC-HVDC） transmission technology is a promising solution for integrating renewable power to the grid. Considering power quality and fault current limitations， current grid-forming control usually adopts a dual closed-loop structure of AC voltage and AC current. This control structure relies on the voltage-current integral relationship of the AC-side filter capacitor and grid current feedforward to achieve stable control of the AC voltage. However， the AC side of the modular multilevel converter （MMC） usually lacks a centralized filter capacitor， and obtaining AC-side current feedforward to decouple from the grid is difficult， leading to degraded AC voltage control performance. [Methods] To solve this problem， this study proposes a novel dual-closed-loop AC voltage-control strategy for grid-forming VSC-HVDC converters. The strategy does not rely on the AC capacitance but adjusts the AC voltage of the PCC by controlling the voltage drop on the grid impedance. [Results] Simulation verification based on PSCAD/EMTDC showed that， under the proposed control mode， the grid-forming MMC exhibited good operational stability and active/reactive power dynamic control performance under different grid conditions. [Conclusions] The proposed control strategy can effectively improve the AC voltage-AC current dual-closed-loop control performance， operational stability， and grid adaptability of grid-forming MMC. |
| format | Article |
| id | doaj-art-4e006d05e3e04c8cb9d8df3cc05f049d |
| institution | DOAJ |
| issn | 1000-7229 |
| language | zho |
| publishDate | 2025-05-01 |
| publisher | Editorial Department of Electric Power Construction |
| record_format | Article |
| series | Dianli jianshe |
| spelling | doaj-art-4e006d05e3e04c8cb9d8df3cc05f049d2025-08-20T03:13:53ZzhoEditorial Department of Electric Power ConstructionDianli jianshe1000-72292025-05-01465122310.12204/j.issn.1000-7229.2025.05.002Improved Dual Closed-Loop Control for Modular Multilevel Converters Based on Voltage Drop on Grid ImpedanceLIU Shan, LIU Qi, ZHU Lin, YAN Jun, CHI Chengbin, SUN Zengjie01. State Grid Corporation of China，Beijing 100032， China;2. State Key Laboratory of Advanced Power Transmission Technology （China Electric Power Research Institute）， Beijing 102209， China;3. Beijing Key Laboratory of DC Grid Technology and Simulation （China Electric Power Research Institute），Beijing 102209，China;4. State Grid Hebei Electric Power Co.， Ltd.， Shijiazhuang 050021， China[Objective] As renewable power bases gradually expand from load centers to remote areas such as deep offshore， deserts， and barren lands， using grid-forming voltage source converter-based high voltage direct current （VSC-HVDC） transmission technology is a promising solution for integrating renewable power to the grid. Considering power quality and fault current limitations， current grid-forming control usually adopts a dual closed-loop structure of AC voltage and AC current. This control structure relies on the voltage-current integral relationship of the AC-side filter capacitor and grid current feedforward to achieve stable control of the AC voltage. However， the AC side of the modular multilevel converter （MMC） usually lacks a centralized filter capacitor， and obtaining AC-side current feedforward to decouple from the grid is difficult， leading to degraded AC voltage control performance. [Methods] To solve this problem， this study proposes a novel dual-closed-loop AC voltage-control strategy for grid-forming VSC-HVDC converters. The strategy does not rely on the AC capacitance but adjusts the AC voltage of the PCC by controlling the voltage drop on the grid impedance. [Results] Simulation verification based on PSCAD/EMTDC showed that， under the proposed control mode， the grid-forming MMC exhibited good operational stability and active/reactive power dynamic control performance under different grid conditions. [Conclusions] The proposed control strategy can effectively improve the AC voltage-AC current dual-closed-loop control performance， operational stability， and grid adaptability of grid-forming MMC.https://www.cepc.com.cn/fileup/1000-7229/PDF/1745741294447-897655717.pdfvoltage source converter-based high voltage direct current（vsc-hvdc）|grid-forming control|ac voltage control|modular multilevel converter |
| spellingShingle | LIU Shan, LIU Qi, ZHU Lin, YAN Jun, CHI Chengbin, SUN Zengjie Improved Dual Closed-Loop Control for Modular Multilevel Converters Based on Voltage Drop on Grid Impedance Dianli jianshe voltage source converter-based high voltage direct current（vsc-hvdc）|grid-forming control|ac voltage control|modular multilevel converter |
| title | Improved Dual Closed-Loop Control for Modular Multilevel Converters Based on Voltage Drop on Grid Impedance |
| title_full | Improved Dual Closed-Loop Control for Modular Multilevel Converters Based on Voltage Drop on Grid Impedance |
| title_fullStr | Improved Dual Closed-Loop Control for Modular Multilevel Converters Based on Voltage Drop on Grid Impedance |
| title_full_unstemmed | Improved Dual Closed-Loop Control for Modular Multilevel Converters Based on Voltage Drop on Grid Impedance |
| title_short | Improved Dual Closed-Loop Control for Modular Multilevel Converters Based on Voltage Drop on Grid Impedance |
| title_sort | improved dual closed loop control for modular multilevel converters based on voltage drop on grid impedance |
| topic | voltage source converter-based high voltage direct current（vsc-hvdc）|grid-forming control|ac voltage control|modular multilevel converter |
| url | https://www.cepc.com.cn/fileup/1000-7229/PDF/1745741294447-897655717.pdf |
| work_keys_str_mv | AT liushanliuqizhulinyanjunchichengbinsunzengjie improveddualclosedloopcontrolformodularmultilevelconvertersbasedonvoltagedropongridimpedance |