基于直接时间反转法的直流配电网故障测距  

Fault location of a DC distribution network based on a direct time reversal method

作　　者：杨欢红 朱子叶 黄文焘[2] 余威 周思怡 YANG Huanhong;ZHU Ziye;HUANG Wentao;YU Wei;ZHOU Siyi(Shanghai University of Electric Power,Shanghai 200090,China;Key Laboratory of Power Transmission andTransformation Control,Ministry of Education,Shanghai Jiao Tong University,Shanghai 200240,China)

机构地区：[1]上海电力大学,上海200090 [2]电力传输与功率变换控制教育部重点实验室(上海交通大学),上海200240

出　　处：《电力系统保护与控制》2022年第16期66-75,共10页Power System Protection and Control

基　　金：国家自然科学基金项目资助(51877135)。

摘　　要：针对直流配电网电能分布不均匀造成定位偏差的问题,着眼电流突变量的频段分布特性,利用直接时间反转法将距离问题转化为点源位置响应。同时利用离散二进小波的平移不变性,将行波信号高频分量模极大值以脉冲激励形式重构时间反转故障暂态行波信号,对应刻画其尖锐变化点,突出能量分布特征,不受故障信息量少的限制,从理论角度证明了该方法在主馈线和T接线路的适用性。通过在PSCAD/EMTDC中搭建±15 kV两端中压柔性直流配电网模型,对于不同过渡电阻和不同故障类型进行故障仿真和数据采集验证。结果表明,所提方法在5 ms短时窗内实现测距,抗过渡电阻能力强,能够反应不同工况下故障线路电磁能量的变化。There is a problem of deviation in fault location caused by uneven distribution of electrical energy in a DC distribution network. Focusing on the frequency band distribution characteristics of current mutation, a direct time reversal method is used to transform the distance problem into the response of the point current source field, and the translation invariance of a discrete dyadic wavelet is used at the same time. The time reversal fault transient traveling wave signal is reconstructed by the modulus maxima of the high-frequency component of the traveling wave signal in the form of pulse excitation. Its sharp change points are characterized accordingly, highlighting the characteristics of energy distribution. This is not limited by having little malfunction data. The applicability of the method in the main feeder and T-line is proved theoretically. The ±15 kV topology of a point-to-point MVDC distribution network model is built in PSCAD/EMTDC, and fault simulation and data acquisition verification are carried out considering the change of transition resistance and the influence of different fault types. The results show that the proposed method can realize the location in a short time window of 5 ms, and it has good anti transition resistance ability, which can reflect the change of electromagnetic energy of fault lines in different working conditions.

关 键 词：两端柔性直流配电网 直接时间反转 信号重构 T接线路 故障测距 

分 类 号：TM721.1[电气工程—电力系统及自动化]