摘要
针对现有配电网宏观故障选线方法在实际应用中,选线准确率不高、适应性不强等问题,该文在深入分析谐振接地配电网接地故障暂态特征的基础上,提出了一种基于微观特征量测度的内积变换故障选线新方法:首先,采用变模态分解算法获得故障特征模态,并在对特征模态进行一阶差分的基础上获得故障奇异值点;其次,在故障奇异值点处构造内积变换选线判据,进而求得反映各条馈线故障特性的综合内积值;最后,将最大内积值与最小内积值的差值与事先设置好的阈值进行比较,从而判断出到底是馈线故障,还是母线故障。仿真表明,该文方法原理简单,选线准确率高,可适应大部分故障工况。
For low accuracy and poor adaptability of the existing macro-fault line selection method in the practical application of distribution network,based on an in-depth analysis of the transient characteristics of ground faults in the resonant grounded distribution network,this paper proposes a new method of inner product transformation fault line selection based on micro-characteristic quantity measurement.First,the fault characteristic mode is obtained by using the modal decomposition algorithm,and the singular value points of the fault are obtained based on the first-order difference of the characteristic mode.Second,the inner product transformation line selection criterion is constructed at the singular value point of the fault,and then the comprehensive inner product value that reflects the fault characteristics of each feeder is obtained.Finally,the difference between the maximum inner product value and the minimum inner product value is compared with the preset threshold value,so as to judge whether it is feeder fault or bus fault.Simulation results show that the proposed method is simple in principle and has high accuracy in line selection,and can adapt to most fault conditions.
作者
张怀春
李轶
贾嵘
赵航
赵召
王晓卫
党建
ZHANG Huaichun;LI Yi;JIA Rong;ZHAO Hang;ZHAO Zhao;WANG Xiaowei;DANG Jian(Xianyang Power Supply Branch,Shaanxi Regional Electric Power(Group)Co.,Ltd.,Xianyang 712000,Shaanxi,China;Xi’an University of Technology,Xi’an 710048,Shaanxi,China)
出处
《电网与清洁能源》
北大核心
2022年第3期47-54,共8页
Power System and Clean Energy
基金
国家自然科学基金项目(51779206)
陕西省重点研发计划项目(2019ZDLGY18-03)。
关键词
内积变换
故障选线
微观特征量测度
相角
inner product transform
fault line selection
micro-feature measurement
phase angle
