基于电磁时间反转的串补线路故障测距  

EMTR Theory-based Fault Location for Series Compensated Transmission Line

作　　者：商立群[1] 呼延海 黄若轩 杨晨光 SHANG Liqun;HU Yanhai;HUANG Ruoxuan;YANG Chenguang(School of Electrical and Control Engineering,Xi'an University of Science and Technology,Xi'an 710054,Shaanxi Province,China)

机构地区：[1]西安科技大学电气与控制工程学院,陕西省西安市710054

出　　处：《中国电机工程学报》2020年第20期6603-6608,共6页Proceedings of the CSEE

摘　　要：由于串联补偿电容的存在和金属氧化物可变电阻(metal oxide varistor,MOV)保护装置的非线性,使得具有串联电容补偿装置的输电线路的故障测距变得困难。该文在考虑串补电容对故障信号的影响,以及非线性保护装置的启动时间后,将电磁时间反转(electromagnetic time reversal,EMTR)理论应用于串补线路故障测距,提出一种新的串补线路故障测距方法。首先将线路两端故障电流解耦后进行小波分解,提取故障电流暂态信号,再将该暂态信号进行时间反转,作为电流源连接在构造的镜像线路的两端;然后针对各个假设的故障点,计算其电流有效值,由于真实的故障点具有最大的接地电流,所以具有最大接地电流的点即为故障点。仿真结果验证了提出的故障测距方法的有效性和正确性,并且该方法不受故障类型、过渡电阻及合闸角影响。Because of the existence of series compensation capacitance and the nonlinearity of metal oxide varistor(MOV), it is difficult to locate the fault of transmission line with series compensation capacitance. After considering the influence of series compensation capacitor on fault signal and the start-up time of non-linear MOV, the electromagnetic time reversal(EMTR) theory was applied to the fault location of series compensation line. A novel fault location method of series compensation line was proposed in this paper. Firstly, the fault current at both ends of the line was decoupled by Karenbauer transform and then decomposed by wavelet transform to extract the transient signal of the fault current. Then the transient fault current signal was time reversed and connected to both ends of the mirror image of the transmission line as a current source. The effective value of the current was calculated for each assumed fault point. Because the maximum ground current occurs at the real fault point, the point with the maximum ground current is the fault point. The simulation results verify the validity and correctness of the proposed fault location method, and the method is not affected by fault type, transition resistance and closing angle.

关 键 词：串补线路 故障测距 电磁时间反转 镜像线路 

分 类 号：TM77[电气工程—电力系统及自动化]