基于电磁时间反转理论的非全程同杆双回线故障测距  

Fault location based on electromagnetic time reversal for non whole journey double circuit line on the same pole

作　　者：商立群[1] 吉宁 SHANG Liqun;JI Ning(School of Electrical and Control Engineering,Xi’an University of Science and Technology,Xi’an 710054,China)

机构地区：[1]西安科技大学电气与控制工程学院,陕西西安710054

出　　处：《电力系统保护与控制》2022年第5期128-135,共8页Power System Protection and Control

基　　金：陕西省自然科学基础研究计划项目资助(2021JM393)。

摘　　要：为了解决非全程同杆双回输电线路故障测距中存在的双端数据不同步以及伪根识别的问题,首先利用故障区段识别函数组的正负相位特性确定故障发生的区段。在确定故障区段的基础上,采用了一种基于电磁时间反转的频域前行电流法进行故障测距。然后将故障区段两侧的电压、电流解耦后进行快速傅里叶分解,提取工频分量下的电流前行波并求取共轭。最后计算假设的各个故障点处的电流有效值大小,当有效值为最小时,该点即为故障点。仿真结果表明:该方法不需要双端数据的同步,没有伪根识别问题,同时也不受过渡电阻和故障类型的影响,能实现对非全程同杆双回线的准确故障定位。There is a problem of double end data asynchrony and pseudo-root identification in the fault location of non whole journey double circuit line on the same pole. To solve this problem, first, the fault section is determined using the positive and negative phase characteristics of the fault section identification function group. To determine the fault section,a frequency domain forward current method based on electromagnetic time reversal is proposed for fault location. Then,the voltage and current on both sides of the fault section are decoupled and fast Fourier decomposition is performed. The current forward traveling wave of the power frequency component is extracted and its conjugate value is obtained. Finally,the current effective value at each assumed fault point is calculated. When the calculated effective value of current is the smallest, the corresponding point is the fault point. The proposed method does not need two terminal data synchronization.The simulation results show that there are no problems such as pseudo root identification and the algorithm is not affected by transition resistance, fault type or initial phase angle. Accurate fault location results can be obtained for either a double circuit line or single circuit line section.

关 键 词：非全程同杆双回输电线路 故障测距 电磁时间反转 六序分量法 

分 类 号：TM75[电气工程—电力系统及自动化]