基于三相动态谐波分析的电能表误差检测方法  

Error Detection of Electricity Meters Based on Three-phase Dynamic Harmonic Analysis

作　　者：王桐[1] 张江[1] 张理放 WANG Tong;ZHANG Jiang;ZHANG Lifang(Inner Mongolia Power Research Institute,Hohhot 010020,China)

机构地区：[1]内蒙古电力科学研究院,内蒙古呼和浩特010020

出　　处：《电工技术》2024年第4期102-104,共3页Electric Engineering

摘　　要：在检测电能表误差时,原始信号中谐波的干扰会导致检测结果与实际情况存在较大偏差。为此,提出基于三相动态谐波分析的电能表误差检测方法。在谐波分析阶段,考虑到谐波的动态属性会导致三相信号的采样执行效果难以达到同步,构建了余弦组合窗——旁瓣最低与最速下降窗,利用其对电能表离散信号进行截取,以此避免信号能量向临近谱线泄漏,再利用离散傅里叶变换对信号进行处理,实现对谐波的提取。在误差检测阶段,以离散随机信号的概率密度函数为导向,采用最优直方图曲线拟合法对其加以分析,并结合标准情况下电能表信号的分布状态,实现对误差的计算。在测试结果中,电能表误差检测结果的偏差始终稳定在3.0%以内。Interference of harmonics in original signals causes large deviations of detection results of electricity meters from actual situations.Therefore the present study proposed an electricity meter error detection method based on three-phase dynamic harmonic analysis.In the harmonic analysis stage,considering harmonic-dynamicity-induced asynchronous sampling among signals of the three phases,cosine combination window-side lowest and fastest drop window was constructed and used to separate discrete meter signals so as to avoid leakage of signal energy to adjacent spectrums.And then the extraction of harmonics could be realized by signal processing using discrete Fourier transform.In the error detection stage,guided by probability density function of the discrete random signal,the optimal histogram curve fitting method was used to analyze it,and error calculation was performed from the distribution state of the standard signal.The application of the proposed method can achieve good control of deviation in electricity meter error detection within 3.0%.

关 键 词：三相动态谐波分析 电能表误差 旁瓣最低与最速下降窗 离散傅里叶变换 概率密度函数 最优直方图曲线拟合法 

分 类 号：TM721.1[电气工程—电力系统及自动化]