切改500kV补偿线路的电抗器参数匹配校验计算  

Reactors Parameters Matching Validation Calculation of 500 kV Reconfigured Compensated Lines

作　　者：苏珂 刘宇 张亚丽 辛东昊[1] 丛雨[1] SU Ke;LIU Yu;ZHANG Yali;XIN Donghao;CONG Yu(Inner Mongolia Power Research Institute,Hohhot 010020,China;Nari Group Corporation,Nanjing 211100,China)

机构地区：[1]内蒙古电力科学研究院,呼和浩特010020 [2]南瑞集团有限公司,南京211100

出　　处：《内蒙古电力技术》2020年第6期34-38,共5页Inner Mongolia Electric Power

基　　金：内蒙古电力(集团)有限责任公司科技项目“大规模新能源并网的电磁暂态平台二期扩建及仿真研究”(2019-85)。

摘　　要：以某500 kV切改破建工程为研究对象,基于EMTDC/PSCAD软件建立电磁暂态仿真模型,通过对切改形成高补偿和过补偿线路进行潜供电流和恢复电压仿真计算,认为切改形成线路的参数与原线路高压电抗器参数不匹配。对高补偿线路,非全相谐振过电压的仿真计算表明,中性点小电抗器不允许单独退出运行;对过补偿线路,不合适的中性点小电抗器参数增大了潜供电流和恢复电压水平。通过对中性点小电抗器参数选值进行理论和仿真计算,确定并更换了合适的中性点小电抗器,确保了启动后电网的安全稳定运行。Taking a 500 kV cut-to-reconstruction project as the research object,based on EMTDC/PSCAD software,the electromagnetic transient simulation model is established based on the EMTDC/PSCAD software.The secondary arc current and recovery voltage of the high compensation and over compensated lines formed by switching are simulated and calculated,and it is considered that the parameters of the line formed by switching doesn′t match the parameters of the original high-voltage reactor.For high compensation line,the simulation calculation of open phase resonance overvoltage shows that the small reactor at neutral point can not be out of operation alone;for over compensation line,the inappropriate parameters of small reactor at neutral point will increase the secondary arc current and recovery voltage level.Through the theoretical and simulation calculation of the parameter selection of the small neutral point reactor,the appropriate small neutral reactor at neutral point is determined and replaced to ensure the safe and stable operation of the power grid after the start-up.

关 键 词：切改线路 高补偿 过补偿 中性点小电抗器 谐振过电压 

分 类 号：TM773[电气工程—电力系统及自动化]