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DC Offset Suppression Strategy for Quasi-Z-source Inverter Based on Observer under Weighted Average Current Control
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Junfang LIN1, 2, Guofeng HE  Member, CPSS1, 2, Zichun ZHOU1, 2, Hang WANG1, 2
Journal of Power Supply | 2025, 23(6) : 152 - 161
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Journal of Power Supply | 2025, 23(6): 152-161
• DC-AC Inverters •
DC Offset Suppression Strategy for Quasi-Z-source Inverter Based on Observer under Weighted Average Current Control
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Junfang LIN1, 2, Guofeng HE  Member, CPSS1, 2, Zichun ZHOU1, 2, Hang WANG1, 2
Affiliations
  • 1.College of Electrical Engineering and New Energy, China Three Gorges University, Yichang 443002, China
  • 2.School of Electrical and Control Engineering, Henan University of Urban Construction, Pingdingshan 467036, China
Published: 2025-10-30 doi: 10.13234/j.issn.2095-2805.2025.6.152
Outline
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Aimed at the issue of DC offset injection to the grid when the topology of a quasi-Z-source grid-connected inverter without isolation transformer is adopted, a DC offset suppression strategy based on an observer under weighted average current control is proposed in this paper. First, the topology of the quasi-Z-source inverter and the causes of DC offset are analyzed. Second, the order of an LCL filter is reduced from the third-order to first-order by weighted average current control, thus simplifying the system model and eliminating the resonance problem. Then, a disturbance observer is utilized to observe the DC offset of inverter output voltage in realtime, the DC offset disturbance is dynamically compensated by feedback, and its stability is analyzed. Finally, the proposed strategy was validated by experiments. Experimental results show that the proposed strategy can effectively reduce the DC offset of grid-connected current, meet the grid-connected DC offset requirement of less than 0.5%, and ensure good steady-state and dynamic performances of the inverter.

Quasi-Z-source inverter  /  DC offset suppression  /  weighted average current  /  observer
林俊芳, 何国锋中国电源学会会员, 周子淳, 王航. 加权平均电流控制下基于观测器的准Z源逆变器直流偏置抑制策略. 电源学报, 2025 , 23 (6) : 152 -161 . DOI: 10.13234/j.issn.2095-2805.2025.6.152
Junfang LIN, Guofeng HE, Zichun ZHOU, Hang WANG. DC Offset Suppression Strategy for Quasi-Z-source Inverter Based on Observer under Weighted Average Current Control[J]. Journal of Power Supply, 2025 , 23 (6) : 152 -161 . DOI: 10.13234/j.issn.2095-2805.2025.6.152
Funding
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  • Natural Science Fund Project of Henan Province(222300420400)
Appendix
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Year 2025 volume 23 Issue 6
60
5
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Article Info
doi: 10.13234/j.issn.2095-2805.2025.6.152
  • Receive Date：2023-04-23
  • Online Date：2026-10-26
  • Published：2025-10-30
Article Data
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History
  • Received：2023-04-23
  • Revised：2023-06-08
  • Accepted：2023-07-04
Funding
Natural Science Fund Project of Henan Province(222300420400)
Affiliations
    1.College of Electrical Engineering and New Energy, China Three Gorges University, Yichang 443002, China
    2.School of Electrical and Control Engineering, Henan University of Urban Construction, Pingdingshan 467036, China
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