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Control Strategy for Leakage Current Suppression in Non-isolated Grid-connected Photovoltaic Inverter
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Fengyang GAO  Senior Member, CPSS, Kaiwen YANG, Zhixiang SONG, Xuanyu GAO, Jianning GAO
Journal of Power Supply | 2025, 23(5) : 51 - 60
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Journal of Power Supply | 2025, 23(5): 51-60
• DC-AC Inverters •
Control Strategy for Leakage Current Suppression in Non-isolated Grid-connected Photovoltaic Inverter
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Fengyang GAO  Senior Member, CPSS, Kaiwen YANG, Zhixiang SONG, Xuanyu GAO, Jianning GAO
Affiliations
  • College of Automation and Electrical Engineering, Lanzhou Jiaotong University, Lanzhou 730070, China
Published: 2025-09-30 doi: 10.13234/j.issn.2095-2805.2025.5.51
Outline
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In a grid-connected system of non-isolated photovoltaic (PV) inverters, the electromagnetic interference causes the problem of leakage current. Aimed at this problem, an improved model predictive control strategy is proposed for a three-level inverter. First, a mathematical model of the grid-connected inverter system is established to analyze the generation mechanism of leakage current and its relationship with the common-mode voltage. Second, the common-mode voltage variation rate is controlled to improve the model predictive direct power control algorithm, thereby optimizing the optimization result to achieve the suppression of leakage current. Finally, the conventional strategy and the proposed improved model predictive control strategy are compared and analyzed through simulations in terms of output power, harmonic distortion of grid-connected current, DC-side neutral point potential balance and leakage current amplitude. Results show that the proposed strategy performs well in all the above four aspects, and its leakage current suppression effect can reach 99.5% compared with the conventional model predictive control strategy.

Three-level inverter  /  photovoltaic (PV) system  /  model predictive control  /  leakage current  /  common-mode voltage
高锋阳中国电源学会高级会员, 杨凯文, 宋志翔, 高翾宇, 高建宁. 非隔离型光伏并网逆变器漏电流抑制控制策略. 电源学报, 2025 , 23 (5) : 51 -60 . DOI: 10.13234/j.issn.2095-2805.2025.5.51
Fengyang GAO, Kaiwen YANG, Zhixiang SONG, Xuanyu GAO, Jianning GAO. Control Strategy for Leakage Current Suppression in Non-isolated Grid-connected Photovoltaic Inverter[J]. Journal of Power Supply, 2025 , 23 (5) : 51 -60 . DOI: 10.13234/j.issn.2095-2805.2025.5.51
Funding
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  • Gansu Provincial Science and Technology Department Key Research and Development Project(18YF1FA058)
Appendix
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Year 2025 volume 23 Issue 5
41
4
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Article Info
doi: 10.13234/j.issn.2095-2805.2025.5.51
  • Receive Date：2022-07-27
  • Online Date：2026-10-26
  • Published：2025-09-30
Article Data
Affiliations
History
  • Received：2022-07-27
  • Revised：2022-09-12
  • Accepted：2022-10-29
Funding
Gansu Provincial Science and Technology Department Key Research and Development Project(18YF1FA058)
Affiliations
    College of Automation and Electrical Engineering, Lanzhou Jiaotong University, Lanzhou 730070, China
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