基于动态模式分解的三端多段式架空线-电缆混合输电线路故障定位新方法  

Novel Fault Location Method for Three-terminal Multi-segment Overhead-cable Hybrid Transmission Line Based on Dynamic Mode Decomposition

作　　者：张智伟 范新桥[1] 张利[1] 李慧[1] 刘思嘉 ZHANG Zhiwei;FAN Xinqiao;ZHANG Li;LI Hui;LIU Sijia(School of Automation,Beijing Information Science&Technology University,Beijing 100192,China)

机构地区：[1]北京信息科技大学自动化学院,北京100192

出　　处：《电力系统及其自动化学报》2022年第10期129-137,共9页Proceedings of the CSU-EPSA

摘　　要：针对三端多段式架空线-电缆混合输电线路故障定位问题,提出一种基于动态模式分解算法的故障定位新方法。首先,将能够改善模态混叠的动态模式分解算法和反映瞬时能量变化的Teager能量算子相结合用于故障行波波头准确检测;将三端多段式混合线路简化为“三端线路”,给出一种基于故障初始行波到达各端测点及T节点时间差的故障分支判定条件,并根据其判定出故障支路。然后,计算故障初始行波到达该支路端点和T节点的时间差,并与故障行波由该支路各架空线和电缆的连接点传播到端点和T节点的时间差进行比较,确定故障所在的架空线路段或电缆段。最后,利用双端行波法计算故障距离。仿真结果表明,所提基于动态模式分解算法的故障定位方法可准确判断三端多段式架空线-电缆混合线路的故障支路并定位出故障位置。Aimed at the fault location problem in a three-terminal multi-segment overhead-cable hybrid transmission line,a novel fault location method based on the dynamic mode decomposition(DMD)algorithm is proposed.First,the DMD algorithm which can overcome mode aliasing and the Teager energy operator(TEO)which reflects the instanta⁃neous energy change are combined to accurately detect the fault traveling wave head.Furthermore,the three-terminal multi-segment hybrid line is simplified to a three-terminal line,a fault branch determination condition based on the time difference between the initial fault traveling wave reaching each terminal measuring point and the T-node is given,and the fault branch is determined accordingly.Then,the time difference between the initial fault traveling wave reach⁃ing the branch endpoint and the T-node is calculated,which is further compared with the time differences between the fault traveling wave propagating from each connection point of the branch to the endpoint and to the T-node,respective⁃ly,thus determining the segment including the fault overhead or fault cable line.Finally,the fault distance is calculat⁃ed using the two-terminal traveling wave method.Simulation results show that the proposed fault location method based on the DMD algorithm can accurately judge the fault branch of the three-terminal multi-segment overhead-cable hybrid line and locate the fault location.

关 键 词：故障定位 三端混合线路 多段式 故障支路 动态模式分解 

分 类 号：TM77[电气工程—电力系统及自动化]