架空–电缆混合线路自适应故障区段重合闸的研究  

Research on Adaptive Fault Section Reclosing of Overhead-cable Hybrid Line

作　　者：梁振锋[1] 李天婷 伍美娟 王晓卫 宋国兵[2] LIANG Zhenfeng;LI Tianting;WU Meijuan;WANG Xiaowei;SONG Guobing(School of Electrical Engineering,Xi’an University of Technology,Xi’an 710048,Shaanxi Province,China;School of Electrical Engineering,Xi’an Jiaotong University,Xi’an 710049,Shaanxi Province,China)

机构地区：[1]西安理工大学电气工程学院,陕西省西安市710048 [2]西安交通大学电气工程学院,陕西省西安市710049

出　　处：《电网技术》2022年第3期1127-1134,共8页Power System Technology

基　　金：陕西省重点研发计划(2018ZDXM-GY-169)。

摘　　要：针对架空–电缆混合线路无法确定是否开放重合闸的问题,提出一种自适应故障区段的重合闸方法。在架空线路段和电缆线路段连接处装设阻波器,当混合线路发生故障,线路两端保护装置采集三相电压值,通过离散小波变换和傅里叶变换对电压线模量进行频谱分析,利用架空线路段故障与电缆线路段故障时电压高频分量的差异构成判据,分别进行故障区段判别,根据判别结果决定是否开放重合闸。当架空线路段故障时,开放重合闸;当电缆线路段故障时,闭锁重合闸。利用PSCAD搭建架空–电缆混合线路模型并进行了故障仿真,结果表明该方法可有效判别故障区段,且不受故障类型、故障位置及过渡电阻的影响。For the overhead-cable hybrid lines, it is difficult to determine whether to turn on the reclosing or not during the faults. Aiming at this problem, an adaptive reclosing method is proposed to identify the fault sections. A line trap is installed at the junction of the overhead line section and the cable section.When the hybrid line fails, the protection devices at the both ends of the line collects the three-phase voltage values. The frequency spectrum of line mode voltage is analyzed by the discrete wavelet transformation and the Fourier transformation.Then, the fault section is determined using the differences of the high frequency components of line mode voltage at the both ends of the line respectively, which further helps decide whether to turn on the reclosing or not. The reclosing will be switched on when the overhead line fails, while it will be switched off when the cable line fails. A simulation model for the hybrid line faults is built with the PSCAD. The results show that the fault sections can effectively be identified in the proposed method, which is unaffected by the fault types, the fault locations and the transition resistance.

关 键 词：架空–电缆混合线路 自适应重合闸 阻波器 高频分量 

分 类 号：TM721[电气工程—电力系统及自动化]