基于可控串联电抗的新能源送出线路故障性质识别方法  

Fault Identification Method of New Energy Transmission Line Based on Controllable Series Reactance

作　　者：杨宏宇[1] 李振兴[2] 袁超[1] 刘亚南[1] 唐一铭[1] 张萌萌 YANG Hongyu;LI Zhenxing;YUAN Chao;LIU Yanan;TANG Yiming;ZHANG Mengmeng(Jiangsu Frontier Electric Technology Co.Ltd.,Nanjing 211102,Jiangsu Province,China;China Three Gorges University,Yichang 443002,Hubei Province,China)

机构地区：[1]江苏方天电力技术有限公司,江苏省南京市211102 [2]三峡大学,湖北省宜昌市443002

出　　处：《现代电力》2024年第1期55-64,共10页Modern Electric Power

基　　金：国家自然科学基金项目(52077120)。

摘　　要：针对不带并联电抗器的新能源送出线,能否正确区分故障性质是确保新能源系统安全可靠运行的重中之重。为降低新能源送出线故障对电力设备和系统的冲击,提高重合闸成功率,减少新能源发电系统脱网的发生,提出基于可控串联电抗限流信息的新能源送出线路故障性质识别方法。在送出线路上设计串联可控限流电抗器,在线路故障相跳闸时基于等值阻抗的预判投入可控电抗,在串联电抗限流特性下分析瞬时性故障和永久性故障时的线路电流差异,建立电流突变量比较判据,并能够确定故障电弧熄灭时刻,进而构建新能源场站送出线路基于故障性质识别的自适应重合闸策略。仿真结果表明,所提方法能快速、可靠地识别结果,应用在新能源场站送出线路工程上能有效提高线路的重合率。For new energy transmission lines without shunt reactors,whether the fault nature can be correctly distinguished is the top priority to ensure the safe and reliable operation of the new energy system.In order to reduce the impact of new energy transmission line faults on power equipment and systems,improve the success rate of reclosers,and reduce the problem of new energy power generation systems off the grid.A new fault identification method based on controllable series reactance and current information was proposed.When transmission line is fault,serial controllable current limiting reactor is designed,come controlled reactance to use when fault phase trip occurs.Based on the small current difference between instantaneous fault and permanent fault of the system in reactance series line,the comparison criterion of current mutation quantity was established to determine the time when the fault arc goes out,and a new fault property identification strategy for new energy station transmission line was constructed.The identification results are fast and reliable,and it can effectively improve the line coincidence rate in the new energy station transmission line project.

关 键 词：新能源送出线 可控串联电抗 瞬时性故障 永久性故障 熄弧时刻判定 

分 类 号：TM773[电气工程—电力系统及自动化]