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Stability Study of Grid-connected Current Based on LCL Inverter
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Jian CHANG1, 2, Lei WANG1, 2, Pengchao ZHANG1, 2, Zhengze BAO2, Liangbin TANG1, 2, Heng ZHANG1, 2
Journal of Power Supply | 2026, 24(7) : 213 - 221
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Journal of Power Supply | 2026, 24(7): 213-221
• Power Electronic Dominated Power Systems •
Stability Study of Grid-connected Current Based on LCL Inverter
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Jian CHANG1, 2, Lei WANG1, 2, Pengchao ZHANG1, 2, Zhengze BAO2, Liangbin TANG1, 2, Heng ZHANG1, 2
Affiliations
  • 1.School of Mechanical Engineering, Shaanxi University of Technology, Hanzhong 723001, China
  • 2.Shaanxi Key Laboratory of Industrial Automation, Shaanxi University of Technology, Hanzhong 723001, China
Published: 2026-07-30 doi: 10.13234/j.issn.2095-2805.2026.7.213
Outline
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In the inverter grid-connected system with weak grid, the existence of grid impedance and voltage harmonic perturbation will cause the distortion of grid-connected current, and the traditional voltage full feedforward method reduces the steady-state error but affects the quality of current, and even threatens the instability of the system. To address the above problems, it is proposed to improve the grid voltage feedforward, i.e., to add resonant feedforward in the feedforward channel to offset the influence of grid impedance, and at the same time ensure the system open-loop gain, increase the system margin, and improve the stability; and secondly to introduce a proportional multi-resonance controller instead of the traditional proportional integral controller, which is used to suppress the influence of grid harmonics on the grid-connected currents, and then to lower the harmonic content of the grid-connected currents and improve the quality of grid-connected currents. Finally, the effectiveness of the control strategy is verified by simulation.

Weak grid  /  LCL inverter  /  active damping  /  voltage feedforward  /  multi-resonance controller
常建, 王磊, 张鹏超, 保正泽, 唐梁彬, 张恒. 基于LCL逆变器并网电流的稳定性研究. 电源学报, 2026 , 24 (7) : 213 -221 . DOI: 10.13234/j.issn.2095-2805.2026.7.213
Jian CHANG, Lei WANG, Pengchao ZHANG, Zhengze BAO, Liangbin TANG, Heng ZHANG. Stability Study of Grid-connected Current Based on LCL Inverter[J]. Journal of Power Supply, 2026 , 24 (7) : 213 -221 . DOI: 10.13234/j.issn.2095-2805.2026.7.213
Funding
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  • National Science Foundation of China(62176146)
Appendix
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Year 2026 volume 24 Issue 7
27
3
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Article Info
doi: 10.13234/j.issn.2095-2805.2026.7.213
  • Receive Date：2024-09-23
  • Online Date：2026-10-29
  • Published：2026-07-30
Article Data
Affiliations
History
  • Received：2024-09-23
  • Revised：2024-10-20
  • Accepted：2024-11-07
Funding
National Science Foundation of China(62176146)
Affiliations
    1.School of Mechanical Engineering, Shaanxi University of Technology, Hanzhong 723001, China
    2.Shaanxi Key Laboratory of Industrial Automation, Shaanxi University of Technology, Hanzhong 723001, China
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