山东电力技术2024，Vol.51Issue(11)：85-92,8.DOI:10.20097/j.cnki.issn1007-9904.2024.11.008
变压器饱和特性对无功盈余下系统过电压影响的仿真研究
Simulation Study on the Influence of Transformer Saturation Characteristics on Overvoltage Under Reactive Power Surplus
摘要
Abstract
During DC commutation failure,DC blocking and other faults,the surplus reactive power may lead to a high overvoltage in the AC system at the sending terminal,and will be transmitted to the new energy terminal in the near zone,which may cause new energy units off-grid in severe cases,endangering the safe operation of the power system.The existing overvoltage studies has rarely considered the influence of transformer saturation on overvoltage.Therefore,this paper began by introducing the mechanism of transformer saturation caused by overvoltage,and then investigated the influence of transformer core saturation characteristics on overvoltage.Theoretical analysis indicated that the overvoltage caused by the surplus reactive power was alleviated when we factored in the effects of transformer saturation.Secondly,the overvoltage simulation model was built by DIgSILENT and PSCAD simulation software for analysis,comparison and verification.Furthermore,the results show that the simulation analysis is consistent with the theoretical analysis,and the system overvoltage can be reduced to some extent when transformer is saturated.In addition,the simulated results indicate that the higher the overvoltage,the more serious core saturation,the larger the air reactance of transformer and the more transformer series,the more significant effect on the overvoltage become.关键词
变压器饱和特性/过电压/无功盈余/电力系统仿真Key words
transformer saturation/over voltage/reactive power surplus/power system simulation分类
信息技术与安全科学引用本文复制引用
张培夫,葛景,王新宝,常宝立,俞秋阳..变压器饱和特性对无功盈余下系统过电压影响的仿真研究[J].山东电力技术,2024,51(11):85-92,8.基金项目
国家重点研发计划项目(2021YFB2400805). National Key Research and Development Program of China(2021YFB 2400805). （2021YFB2400805）
