摘要
振荡波电压法用于局部放电(partial discharge,PD)检测得到了越来越多的应用和研究,但放电脉冲难以完整提取和准确匹配等问题有时会影响局部放电定位的精度和准确率。针对以上问题,首先提出了采用经验模态分解(empirical mode decomposition,EMD)与Teager能量算子相结合的方法对放电脉冲进行有效分割,接着使用动态时间规整(dynamic time warping,DTW)算法计算放电脉冲之间的相似度,并结合其他约束条件对入、反射脉冲进行匹配,最后使用时域反射法对放电点进行精确定位。使用故障电缆的实测数据进行验证,结果表明:该方法能够完整和准确地对放电脉冲进行分割与匹配,在相对误差<0.01的精度下,定位准确率达到81%。所提方法能在高精度下以较高的准确率对局部放电进行定位,为振荡波电压法下电缆局部放电的定位提供新的解决思路。
The oscillatory wave voltage method is widely studied and applied in detection of partial discharge(PD).However,due to the difficulty in extracting and matching PD pulses accurately,the location results are incorrect in some cases.To solve the problem,firstly,a method which combines empirical mode decomposition(EMD)and Teager energy operator is proposed to segment PD pulses was proposed in this paper.Afterwards,the dynamic time warping(DTW)algorithm was used to calculate the similarity between pulses,and the incident and reflecting pulses were matched by combining with some other constraints.The discharges were located eventually under the principle of time domain reflectometry.The method based on EMD and DTW algorithm was evaluated in a field test.The results demonstrate that PD pulses are segmented and matched accurately,and the location results achieve accuracy up to 81%with relative error less than 0.01.The method proposed in this paper can be adopted to locate the PD discharges with high accuracy under high precision,providing a new solution for PD location under oscillatory wave voltage conditions.
作者
张若兵
金森
杜钢
ZHANG Ruobing;JIN Sen;DU Gang(Graduate School at Shenzhen,Tsinghua University,Shenzhen 518055,China;Guangzhou Power Supply Bureau Co.,Ltd.,Guangzhou 510410,China)
出处
《高电压技术》
EI
CAS
CSCD
北大核心
2020年第1期273-281,共9页
High Voltage Engineering
