基于EEMD的电缆故障测距方法仿真研究

正确辨识和检测故障行波信号是实现电缆故障行波定位的关键.为了解决传统EMD方法频带混叠问题,提出了一种基于集合经验模态分解(EEMD)的电缆双端行波测距方法,通过EEMD提取双端故障行波线模分量的固有模态函数,利用基于瞬时频率突变和模极大值的奇异性检测原理进行行波波头的准确标定,实现故障点定位.利用PSCAD/EMTDC(电力系统CAD/电力系统仿真分析软件)软件搭建基于频变特性电缆线路的10 kV配网模型.大量的仿真结果验证了该方法可行,测距精度高.

A Double Terminal Cable Fault Location Method Based on EEMD

Correct identification and detection of fault traveling wave signal is the key to realize the fault location of cable fault.In order to solve the problem of block overlap of frequency bands caused by EMD,a new method based on ensemble empirical mode decomposition (EEMD) is proposed for the double ended traveling wave fault location.The intrinsic mode function of the model component of the double ended fault traveling wave is extracted by EEMD,then the wave head is demarcated by using the method of singularity detection principle based on frequency mutation and modulus maxima.The fault location based on the two terminal fault location algorithm is realized.At last, 10kV distribution network model based on the frequency characteristic of the cable line is built by using PSCAD/EMTDC(power system computer aided design/electro magnetic transient in DC system)software.The effectiveness and high precision of the proposed methodology are demonstrated by a large number of simulation results.