引用本文:赵铁英,王浩然,黄志远,等.一种考虑电流限制的构网型变流器稳定性增强策略[J].电力系统保护与控制,2026,54(10):13-23.
ZHAO Tieying,WANG Haoran,HUANG Zhiyuan,et al.A stability enhancement strategy for grid-forming converters considering current limitation[J].Power System Protection and Control,2026,54(10):13-23
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一种考虑电流限制的构网型变流器稳定性增强策略
赵铁英1,2，王浩然1,2，黄志远1,2，祁昱昂1,2，田培建1,2，杨浩然1,2
1. 河南理工大学电气工程与自动化学院，河南 焦作 454003；2. 河南省煤矿装备智能检测与控制重点实验室，河南 焦作 454003
摘要:
针对电压跌落工况下构网型变流器 (grid-forming converter, GFC) 存在的过流及暂态稳定性不足的问题，提出了一种结合电流限制的暂态稳定性增强控制策略。首先，介绍了所研究的 GFC 结构，分析了过电流的成因及常规限流方法导致暂态失稳的机理。其次，引入自适应虚拟阻抗以限制故障发生及故障持续期间的过电流，并通过电网电压检测自适应调整参考功率，从而提高功角稳定性。此外，提出了一种基于控制器内部变量检测电网电压骤降幅度的方法，无需额外采样电网电压或测量线路阻抗。最后，通过仿真与实验结果的对比分析，验证了所提控制方法的正确性与有效性。
关键词:  构网型变流器  限流  自适应虚拟阻抗  暂态稳定性  虚拟功率角
DOI：10.19783/j.cnki.pspc.251248
分类号:
基金项目:河南省自然科学基金项目资助 (252300421329)；国家自然科学基金项目资助 (U1804143)
A stability enhancement strategy for grid-forming converters considering current limitation
ZHAO Tieying1,2, WANG Haoran1,2, HUANG Zhiyuan1,2, QI Yu'ang1,2, TIAN Peijian1,2, YANG Haoran1,2
1. School of Electrical Engineering and Automation, Henan Polytechnic University, Jiaozuo 454003, China; 2. Henan Key Laboratory of Intelligent Inspection and Control of Coal Mine Equipment, Jiaozuo 454003, China
Abstract:
In response to the issues of overcurrent and insufficient transient stability in grid-forming converters (GFCs) under voltage sag conditions, this paper proposes a transient stability enhancement control strategy incorporating current limitation. First, the structure of the studied GFC is introduced, and the causes of overcurrent as well as the mechanisms by which conventional current limiting methods may lead to transient instability are analyzed. Second, an adaptive virtual impedance is introduced to limit overcurrent during both fault initiation and fault duration. Meanwhile, the reference power is adaptively adjusted through grid voltage detection, thereby improving power-angle stability. In addition, a method for detecting the magnitude of grid voltage dips based on internal controller variables is proposed, which eliminates the need for additional grid voltage measurements or line impedance estimation. Finally, the correctness and effectiveness of the proposed control method are verified through comparative simulation and experimental results.
Key words:  grid-forming converter  current limiting  adaptive virtual impedance  transient stability  virtual power angle
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