摘要
为提高配电网故障选相的精确性与灵敏度,针对高阻接地故障及单相断线故障,提出利用测算的偏转角进行故障选相的方法。首先,分析了高阻接地和断线故障选相失败的原因。然后,根据测量的对地参数来判别发生了高阻故障还是断线故障。最后,提出了基于柔性调控零序电压的选相方法,即:向配电网中性点注入零序电流,调控零序电压相角分别为配电网三相相电压相角,通过注入零序电流及返回零序电压测算故障偏转角,结合判据即可实现故障选相。PSCAD仿真结果表明,该方法可快速准确地选出20 kΩ的单相高阻接地故障相及线路末端断线故障相,且不受故障位置、故障类型、配电网中性点接地方式等因素的影响。
To improve the accuracy and sensitivity of distribution network fault phase selection,a method based on the calculated deflection angle is proposed for a high resistance ground fault and a single phase line fault.First,the reasons for phase selection failure for high resistance grounding and a disconnection fault are analyzed.Then,from the measured parameters to the ground the occurrence of a high resistance or line fault is determined.Finally,a phase selection method based on flexible zero sequence voltage regulation is proposed,that is,zero sequence current is injected into the neutral point of the distribution network,the phase angle of zero sequence voltage is adjusted to be the phase angle of three-phase voltage of the distribution network,and the fault deflection angle is calculated by injecting zero sequence current and zero sequence voltage return.The fault phase selection can be realized by combining the criteria.PSCAD simulation results show that this method can quickly and accurately select 20 kΩsingle-phase high-resistance grounding fault phase and line end disconnection fault phase without being affected by fault location,fault type and neutral grounding mode of the distribution network.
作者
曾祥君
黄慧
喻锟
张程麒
刘战磊
陈柏宇
庞钦
ZENG Xiangjun;HUANG Hui;YU Kun;ZHANG Chengqi;LIU Zhanlei;CHEN Boyu;PANG Qin(School of Electrical and Information Engineering,Changsha University of Science&Technology,Changsha 410114,China;Maintenance Branch,State Grid Hunan Electric Power Co.,Ltd.,Changsha 410004,China)
出处
《电力系统保护与控制》
CSCD
北大核心
2022年第3期9-18,共10页
Power System Protection and Control
基金
国家自然科学基金重点项目资助(51737002,52037001)
中国南方电网项目资助(0562002020030304PD00007)。
关键词
配电网
故障选相
零序电流
高阻故障
断线故障
偏转角
distribution network
fault phase selection
zero sequence current
high resistance fault
broken line fault
deflection angle
