基于DTW算法波形相似性的GIS内隔离开关运行可靠性评估方法研究

Research on Reliability Evaluation Method of Disconnector in GIS Based onWaveform Similarity of DTWAlgorithm

针对GIS内隔离开关在发生机械故障时,其故障区段和非故障区段存在故障特征重叠不足的问题,提出一种基于动态时间弯曲距离搜索的故障分析方法。根据故障时两组行程曲线的DTW距离值较大,非故障时两组曲线的DTW距离值较小,依次将各个隔离开关行程曲线的DTW距离值与设定阈值进行比较,若DTW距离值大于设定阈值则视为存在故障。通过大量仿真验证结果表明,该方法能够明显区分出是否出现故障,对角型隔离开关、直线型隔离开关以及三工位隔离开关具有较强的适用性。

A fault analysis method based on dynamic time warping(DTW)distance search is proposed to solve the problem of insufficient fault feature overlap between fault section and non-fault section when the disconnector in GIS occurs mechanical fault.According to the larger DTW distance value of two groups of travel curves in case of fault and the smaller DTW distance value of two groups of curves in case of no fault,the DTW distance value of each disconnector travel curve is compared with the set threshold value in turn,and the DTW distance value greater than the set threshold value is regarded as the existence of fault.A large number of simulation results show that the method can distinguish whether there is fault or not,and has strong applicability to the fault evaluation of the diagonal type disconnector,linear type disconnector and three position disconnector.