中国电机工程学报2026，Vol.46Issue(8)：3356-3370,中插24,16.DOI:10.13334/j.0258-8013.pcsee.251160
构网型变换器故障恢复阶段电流越限机理及安全控制研究
Overcurrent Mechanism and Safe Control of Grid-forming Converter During Fault Recovery Stage
摘要
Abstract
Virtual impedance technology effectively prevents overcurrent in grid-forming converters during faults,but during the fault recovery stage,there's a risk of current exceeding limits.This paper analyses this post-fault overcurrent mechanism and discovers that the converter's overcurrent occurs only if the virtual impedance design value is higher than the grid's impedance value.Under this condition,the increasing of virtual power angle is the main cause of overcurrent.Accordingly,this paper proposes a current safety control strategy that dynamically adjusts virtual impedance and power command values.This strategy restrains the output current within the safe range while ensuring transient power angle stability.Simulations and experiments confirm the correctness of theory and the effectiveness of proposed strategy.关键词
构网型变流器/虚拟阻抗策略/过流抑制Key words
grid-forming converter/virtual impedance/overcurrent suppression分类
信息技术与安全科学引用本文复制引用
韩鹏,徐式蕴,汪乐天,孙华东,毕经天..构网型变换器故障恢复阶段电流越限机理及安全控制研究[J].中国电机工程学报,2026,46(8):3356-3370,中插24,16.基金项目
国家自然科学基金项目(U2166601) （U2166601）
国家资助博士后研究人员计划(GZB20230688).Project Supported by National Natural Science Foundation of China(U2166601) （GZB20230688）
Postdoctoral Fellowship Program of CPSF(GZB20230688). （GZB20230688）
