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Active Damping Method Based on ${H}_{\infty }$ Filter of LCL Grid-connected Inverter
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Run CHEN1, Jun ZENG1, Junfeng LIU2
Journal of Power Supply | 2024, 22(4) : 121 - 132
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Journal of Power Supply | 2024, 22(4): 121-132
• Renewable Energy System •
Active Damping Method Based on ${H}_{\infty }$ Filter of LCL Grid-connected Inverter
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Run CHEN1, Jun ZENG1, Junfeng LIU2
Affiliations
  • School of Automation Science and Engineering South China University of Technology Guangzhou 510640 China
Published: 2024-07-30 doi: 10.13234/j.issn.2095-2805.2024.4.121
Outline
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Although the LCL filter has a good performance of suppressing high-frequency harmonics, it may cause problems such as resonance oscillation and instability. For an LCL grid-connected inverter, the conventional capacitor-current-feedback type active damping method can suppress the resonant peak effectively, at the cost of additional current sensors. Under this background, a novel active damping control strategy based on an H∞ filter is proposed. The state space model and process noise model of the LCL filter are derived to solve the H∞ filter. The filter capacitor current can be estimated according to the information about grid current and the voltage at a point of common coupling, and feedback is further completed. The system damping is improved, and the estimation accuracy can be guaranteed even if parameter perturbations exist in the LCL filter. Simulation and experimental results show that the proposed method was insensitive to changes in the parameters of the LCL filter and the grid impedance, thereby verifying its feasibility and superiority.

LCL filter  /  grid-connected inverter  /  active damping  /  H∞ filter
Run CHEN, Jun ZENG, Junfeng LIU. Active Damping Method Based on ${H}_{\infty }$ Filter of LCL Grid-connected Inverter[J]. Journal of Power Supply, 2024 , 22 (4) : 121 -132 . DOI: 10.13234/j.issn.2095-2805.2024.4.121
Funding
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  • National Natural Science Foundation of China(62173148)
  • National Natural Science Foundation of China(51877085)
Appendix
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Year 2024 volume 22 Issue 4
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307
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Article Info
doi: 10.13234/j.issn.2095-2805.2024.4.121
  • Receive Date：2021-12-10
  • Online Date：2025-07-21
  • Published：2024-07-30
Article Data
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History
  • Received：2021-12-10
  • Revised：2022-03-08
  • Accepted：2022-04-06
Funding
National Natural Science Foundation of China(62173148)
National Natural Science Foundation of China(51877085)
Affiliations
    School of Automation Science and Engineering South China University of Technology Guangzhou 510640 China
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小菇科 Mycenaceae 2 12 5.74 丝盖伞属 Inocybe 5 2.39
多孔菌科 Polyporaceae 8 14 6.70 蜡蘑属 Laccaria 5 2.39
红菇科 Russulaceae 3 23 11.00 小皮伞属 Marasmius 6 2.87
小菇属 Mycena 11 5.26
光柄菇属 Pluteus 5 2.39
红菇属 Russula 17 8.13
栓菌属 Trametes 5 2.39
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