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Delay Compensation Strategy for Widening Effective Damping Zone of LCL Grid-connected Inverter
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Xueyi ZHANG1, Dong ZHANG1, 2, Shengqing LI1, 2
Journal of Power Supply | 2025, 23(3) : 280 - 289
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Journal of Power Supply | 2025, 23(3): 280-289
• DC-AC Inverters •
Delay Compensation Strategy for Widening Effective Damping Zone of LCL Grid-connected Inverter
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Xueyi ZHANG1, Dong ZHANG1, 2, Shengqing LI1, 2
Affiliations
  • 1.School of Electrical and Information Engineering, Hunan University of Technology, Zhuzhou 412007, China
  • 2.Hunan Engineering Research Center for Intelligent Control Technology of Photovoltaic Microgrid, Zhuzhou 412007, China
Published: 2025-05-30 doi: 10.13234/j.issn.2095-2805.2025.3.280
Outline
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In an LCL grid-connected inverter system under digital control, the control delay reduces the performance of a capacitive current feedback active damping method for suppressing resonance peaks, i.e., the effective damping zone is only 0–fs/6 (where fs is the sampling frequency), which seriously affects the system stability. Aimed at this problem, a delay compensation strategy is proposed. First, a delay compensation link is added to the forward path to increase the system boundary frequency. Then, the stable conditions for the system after compensation are deduced according to the stability criterion. Finally, the capacitive current feedback coefficient is designed under the new stable conditions. The analysis results show that the proposed strategy can widen the effective damping zone to 0–0.4fs, thereby expanding the selection range of the filter resonant frequency fr, reducing the inverter’s design cost and improving the system’s adaptability to a wide range of grid impedance changes. Simulation and experimental results show that the proposed strategy widens the stable operation zone of the system and improves its poor stability when the resonant frequency fr is equal to or more than fs/6 under the weak grid.

Control delay  /  capacitive current feedback  /  effective damping zone  /  delay compensation
张学毅, 张栋, 李圣清. 拓宽LCL型并网逆变器有效阻尼区的延时补偿策略. 电源学报, 2025 , 23 (3) : 280 -289 . DOI: 10.13234/j.issn.2095-2805.2025.3.280
Xueyi ZHANG, Dong ZHANG, Shengqing LI. Delay Compensation Strategy for Widening Effective Damping Zone of LCL Grid-connected Inverter[J]. Journal of Power Supply, 2025 , 23 (3) : 280 -289 . DOI: 10.13234/j.issn.2095-2805.2025.3.280
Funding
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  • National Natural Science Foundation of China(51977072)
Appendix
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Year 2025 volume 23 Issue 3
70
10
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Article Info
doi: 10.13234/j.issn.2095-2805.2025.3.280
  • Receive Date：2022-04-02
  • Online Date：2026-10-26
  • Published：2025-05-30
Article Data
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History
  • Received：2022-04-02
  • Revised：2022-08-02
  • Accepted：2022-08-22
Funding
National Natural Science Foundation of China(51977072)
Affiliations
    1.School of Electrical and Information Engineering, Hunan University of Technology, Zhuzhou 412007, China
    2.Hunan Engineering Research Center for Intelligent Control Technology of Photovoltaic Microgrid, Zhuzhou 412007, China
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