基于超分辨率最小均方广义互相关算法的局部放电超声定位方法  

Partial Discharge Ultrasound Localization Method Based on SRLMSGCC Algorithm

作　　者：关宇 董明[1] 常昊鑫 张崇兴[1] 任明[1] GUAN Yu;DONG Ming;CHANG Haoxin;ZHANG Chongxing;REN Ming(State Key Laboratory of Electrical Insulation and Power Equipment(Xi’an Jiaotong University),Xi’an 710049,Shaanxi Province,China)

机构地区：[1]电工材料电气绝缘全国重点实验室(西安交通大学),陕西省西安市710049

出　　处：《电网技术》2025年第4期1708-1716,共9页Power System Technology

基　　金：国家重点研发计划项目(2023YFB2406900)。

摘　　要：时间差估计是局部放电定位的重要一环,现有算法受限于采样设备采样率,会产生无法忽略的系统误差,进而使定位误差过大。为了解决上述问题,该文提出了超分辨率最小均方广义互相关(super resolution least mean square generalized cross correlation,SR-LMS-GCC)时间差估计算法,使时间差估计的结果突破采样率的限制,能更精确地估算两信号之间的时间差。首先对离散时间信号的广义互相关进行改进,通过频率调整扩展了频谱,能够有效提高时间差估计的时间分辨率。为解决真实时间差溢出时间差估计区间的问题,提出了多级交叉互相关器的框架,并与自适应广义互相关时间差估计方法结合起来,提出了SR-LMS-GCC算法,并通过仿真讨论了算法参数的设置规则。最后通过实验验证,SR-LMS-GCC算法在时间差估计和定位准确度方面的比传统的受分辨率限制的算法均提升了85%以上。Time difference estimation is an important part of partial discharge localization.Existing algorithms are limited by the sampling rate of sampling equipment,which can generate significant system errors and result in excessive localization errors.To address the aforementioned issues,this paper proposes the Super Resolution Least Mean Square Generalized Cross Correlation(SR-LMS-GCC)algorithm,which breaks through the limitation of sampling rate and can more accurately estimate the time difference between two signals.This paper first improves the generalized cross-correlation of discrete-time signals by expanding the spectrum through frequency adjustment,which can effectively improve the time resolution of time difference estimation.To solve the problem of real time difference overflow time difference estimation interval,a multi-level cross correlator framework is proposed,and combined with the adaptive generalized cross-correlation time difference estimation method,the SR-LMS-GCC algorithm is proposed.The setting rules of algorithm parameters are discussed through simulation.Finally,through experimental verification,the SR-LMS-GCC algorithm has improved time difference estimation and positioning accuracy by about 90%compared to traditional resolution limited algorithms.

关 键 词：时间差估计 超分辨率 局部放电 超声定位 

分 类 号：TM721[电气工程—电力系统及自动化]