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Three-phase Unbalanced Power Fluctuation Suppression of Grid-forming Inverter Based on VSG
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Jiawen LIU1, 2, Chuanchuan HOU  Member, CPSS2, Miao ZHU  Senior Member, CPSS2, Xundong GONG3, Chen YANG3
Journal of Power Supply | 2026, 24(3) : 178 - 189
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Journal of Power Supply | 2026, 24(3): 178-189
• Power Electronic Dominated Power Systems •
Three-phase Unbalanced Power Fluctuation Suppression of Grid-forming Inverter Based on VSG
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Jiawen LIU1, 2, Chuanchuan HOU  Member, CPSS2, Miao ZHU  Senior Member, CPSS2, Xundong GONG3, Chen YANG3
Affiliations
  • 1.School of Electrical Engineering, Shanghai University of Electric Power, Shanghai 200090, China
  • 2.School of Electronic Information and Electrical Engineering, Shanghai Jiao Tong University, Shanghai 200240, China
  • 3.Suzhou Power Supply Company, State Grid Jiangsu Electric Power Co., Ltd., Suzhou 215100, China
Published: 2026-03-30 doi: 10.13234/j.issn.2095-2805.2026.3.178
Outline
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In a new power system characterized by a “dual-high” structure, the virtual synchronous generator (VSG) technology has been widely applied in the grid-forming control of inverters owing to its inherent response capability to inertia and frequency variations. When the grid voltage is unbalanced, the power injected by grid-connected inverters based on the conventional VSG will include second-harmonic fluctuations. To address this issue, a virtual voltage and current regulation strategy under three-phase unbalanced conditions based on VSG is proposed. Through the analysis of the mechanism of inverter power fluctuations and the virtual phase-current regulation (VPCR) method used in grid-following control, it is pointed out that the existing VPCR method cannot solve the power fluctuation problem under grid-forming control. With the combination of grid-forming control characteristics of VSG, a power fluctuation suppression strategy is proposed, which integrates virtual voltage and current regulation on the basis of the existing VPCR method. This approach only requires adjusting the voltage and current gain coefficients, without the need for additional control loops or positive-negative sequence separation, thereby fully preserving the control characteristics and grid-forming attributes of VSG. The proposed method can effectively suppress power fluctuations under voltage imbalance. Experimental results verified the feasibility of the proposed power fluctuation suppression strategy.

Virtual synchronous generator (VSG)  /  voltage imbalance  /  power fluctuation  /  virtual voltage-current control  /  grid-forming control
刘家文, 侯川川中国电源学会会员, 朱淼中国电源学会高级会员, 龚逊东, 杨晨. 基于虚拟同步机的构网逆变器三相不平衡功率波动抑制. 电源学报, 2026 , 24 (3) : 178 -189 . DOI: 10.13234/j.issn.2095-2805.2026.3.178
Jiawen LIU, Chuanchuan HOU, Miao ZHU, Xundong GONG, Chen YANG. Three-phase Unbalanced Power Fluctuation Suppression of Grid-forming Inverter Based on VSG[J]. Journal of Power Supply, 2026 , 24 (3) : 178 -189 . DOI: 10.13234/j.issn.2095-2805.2026.3.178
Funding
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  • State Grid Corporation of China Technology Project(SGJSSZ00KJJS2312931)
Appendix
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Year 2026 volume 24 Issue 3
31
5
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Article Info
doi: 10.13234/j.issn.2095-2805.2026.3.178
  • Receive Date：2025-03-28
  • Online Date：2026-10-29
  • Published：2026-03-30
Article Data
Affiliations
History
  • Received：2025-03-28
  • Revised：2025-06-09
  • Accepted：2025-06-17
Funding
State Grid Corporation of China Technology Project(SGJSSZ00KJJS2312931)
Affiliations
    1.School of Electrical Engineering, Shanghai University of Electric Power, Shanghai 200090, China
    2.School of Electronic Information and Electrical Engineering, Shanghai Jiao Tong University, Shanghai 200240, China
    3.Suzhou Power Supply Company, State Grid Jiangsu Electric Power Co., Ltd., Suzhou 215100, China
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