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Research on Balance Control Strategy for Grid-connected Inverter System Under Unbalanced Grid
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Aiwen QU  Member, CPSS1, 2, Daozhou WEI1, Jianhua XUE1
Journal of Power Supply | 2026, 24(6) : 220 - 231
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Journal of Power Supply | 2026, 24(6): 220-231
• Power Electronic Dominated Power Systems •
Research on Balance Control Strategy for Grid-connected Inverter System Under Unbalanced Grid
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Aiwen QU  Member, CPSS1, 2, Daozhou WEI1, Jianhua XUE1
Affiliations
  • 1.College of Electrical Engineering and Automation, Fuzhou University, Fuzhou 350108, China
  • 2.Fujian Key Laboratory of New Energy Generation and Power Conversion, Fuzhou 350108, China
Published: 2026-06-30 doi: 10.13234/j.issn.2095-2805.2026.6.220
Outline
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Under an unbalanced power grid, the grid-connected inverter system may experience an imbalance in grid-connected current or load voltage. To achieve a grid-connected current balance or a load voltage balance in the grid-connected inverter system under linear and symmetrical load, a balance control strategy based on a negative-sequence compensation algorithm is proposed. On the basis of adding a compensation impedance device between the local load and the point of common coupling (PCC), the positive- and negative-sequence components of current on the inverter side are controlled by the reference value of output voltage from the inverter, which is generated by superimposing the positive-sequence loop output with the negative-sequence compensation loop output with different balance control objectives, so as to achieve the balance control of these objectives. The reference values of the positive- and negative-sequence current loops on the inverter side are obtained using the grid-side current loop or the local load identification algorithm. Finally, the feasibility and the effectiveness of the proposed strategy were verified by simulation and experimental results.

Unbalanced grid  /  grid-connected inverter system  /  grid-connected current balance  /  load voltage balance  /  negative-sequence compensation
屈艾文中国电源学会会员, 韦道洲, 薛建华. 不平衡电网下并网逆变系统平衡控制策略研究. 电源学报, 2026 , 24 (6) : 220 -231 . DOI: 10.13234/j.issn.2095-2805.2026.6.220
Aiwen QU, Daozhou WEI, Jianhua XUE. Research on Balance Control Strategy for Grid-connected Inverter System Under Unbalanced Grid[J]. Journal of Power Supply, 2026 , 24 (6) : 220 -231 . DOI: 10.13234/j.issn.2095-2805.2026.6.220
Funding
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  • Natural Science Foundation of Fujian Province(2020J01508)
Appendix
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Year 2026 volume 24 Issue 6
36
7
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Article Info
doi: 10.13234/j.issn.2095-2805.2026.6.220
  • Receive Date：2024-05-25
  • Online Date：2026-10-29
  • Published：2026-06-30
Article Data
Affiliations
History
  • Received：2024-05-25
  • Revised：2024-08-06
  • Accepted：2024-09-02
Funding
Natural Science Foundation of Fujian Province(2020J01508)
Affiliations
    1.College of Electrical Engineering and Automation, Fuzhou University, Fuzhou 350108, China
    2.Fujian Key Laboratory of New Energy Generation and Power Conversion, Fuzhou 350108, China
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