摘要
大型电力变压器在分闸后常因磁滞效应而残留剩磁,这不仅可能引发励磁涌流损害变压器,还可能对电网稳定性构成威胁。尽管现有剩磁消除方法在一定程度上缓解了这一问题,但仍存在操作复杂、耗时、效果有限等局限性。针对以上不足,该文提出一种基于储能振荡的新型快速剩磁消除方法。通过理论分析确定关键电容参数,并在不同电压等级的电力变压器上开展仿真与实验验证。结果表明,该方法借助振荡过程的能量交换,实现退磁激励与铁心参数的“自适应”匹配,可快速高效消除剩磁,退磁时间仅min级,耗时较传统方法缩短90%以上;对比退磁后的空载电流可知,其退磁效果提升20%以上,证实该方法在退磁效果与速度两方面均优于传统退磁技术。实际应用中,该方法表现出快速、可靠、高效的特性,可为电力变压器安全运行及电网稳定性提升提供一定技术支撑。
Residual magnetism often remains in large power transformers after opening due to hysteresis effect,whichnot only risks damaging transformers via inrush current but also threatens power grid stability.Although existing elimination methods have mitigated this issue to some extent,they suffer from limitations like complex operation,long processing time,and limited effectiveness.To address these drawbacks,this paper proposes a novel fast residual magnetism elimination method based on energy storage oscillation.First,key capacitor parameters are determined via theoretical analysis.Then,simulation and experimental verification are conducted on power transformers of different voltage levels.Results show that by leveraging energy exchange in the oscillation process,the method achieves"adaptive"matching between demagnetization excitation and core parameters,enabling rapid and efficient residual magnetism elimination.Specifically,its demagnetization time is only minute-level,cutting time consumption by over 90%versus traditional methods;comparing post-demagnetization no-load current shows its effect is improved by more than 20%.These results confirm the proposed method outperforms traditional technologiesin both effect and speed.In practical applications,it features rapidity,reliability,and high efficiency,providing strong technical support for safe transformer operation and power grid stability improvement.
作者
郭泽
魏君义
赵晓震
杨定乾
张朔
李奎
GUO Ze;WEI Junyi;ZHAO Xiaozhen;YANG Dingqian;ZHANG Shuo;LI Kui(State Key Laboratory of Reliability andIntelligence of Electrical Equipment(Hebei University of Technology),Beichen District,Tianjin 300130,China;State Grid Xinjiang Electric Power Research Institute,Urumqi 830013,Xinjiang Uygur Autonomous Region,China;University of Nebraska-Lincoln,NE 68588,Nebraska,USA)
出处
《中国电机工程学报》
北大核心
2025年第24期9796-9806,I0027,共12页
PROCEEDINGS OF THE CHINESE SOCIETY FOR ELECTRICAL ENGINEERING
基金
天津市教委科研计划项目(2023KJ301)
河北省高等学校科学研究项目(青年基金项目)(QN2025339)。
关键词
储能振荡
磁滞曲线
退磁
电力变压器
剩磁
energy storage oscillation
magnetic hysteresis loop
demagnetization
power transformer
residual magnetism
