谐波存在时的改进电能计量方法及应用  

Improved electric power measurement method and its application while harmonic exists

作　　者：温和[1,2] 滕召胜[1] 胡晓光[2] 王永[1] 曾博[1] 

机构地区：[1]湖南大学电气与信息工程学院,长沙410082 [2]北京航空航天大学自动化科学与电气工程学院,北京100191

出　　处：《仪器仪表学报》2011年第1期157-162,共6页Chinese Journal of Scientific Instrument

基　　金：国家自然科学基金(61002035;60872128);中国博士后科学基金(20100471213);高等学校博士学科点专项科研基金(新教师类)(2010016112000A)资助项目

摘　　要：为减少谐波存在时的电能计量误差,本文提出一种基于三角自卷积窗的改进谐波电能频域计量算法。首先,采用三角自卷积窗对电压、电流信号进行加权处理,以抑制频谱泄漏和谐波间相互干扰;其次,运用插值FFT算法从频域实现电压、电流信号参数(频率、幅值和相位)的高精度估计值;最后,根据Budeanu给出的谐波电能定义,结合电压、电流信号参数实现谐波电能计量。非同步采样情况下,分别采用典型余弦组合窗(Hanning窗、Blackman-Harris窗与Rife-Vincent窗)和4阶三角自卷积窗进行谐波电能计量的仿真实验结果表明:采用三角自卷积窗函数可克服白噪声和基波频率波动影响,提高了谐波电能计量准确度。本文算法在三相多功能谐波电能表中的应用证明了其有效性和准确性。To reduce the electric power measurement error caused by harmonics,an improved electric power measurement method based on triangular self-convolution window is presented in this paper.First,the sampled voltage and current signals are weighted by triangular self-convolution window.Then,the harmonic parameters of voltage and current signals are estimated with windowed interpolated FFT algorithm.Last,the electric power of harmonics can be measured using Budeanu＇s definition.Simulation experiments were carried out using the Hanning window,Blackman-Harris window,Rife-Vincent（I） window and triangular self-convolution window under unsynchronized sampling condition;experiment results demonstrate that the effect of fundamental frequency variation and white noise can be restrained by using triangular self-convolution window.The application and experiment results in 3 phase multifunction harmonic power meter show the usefulness and accuracy of the presented method.

关 键 词：电能计量 谐波 FFT 窗函数 频谱泄漏 

分 类 号：TN911[电子电信—通信与信息系统] TM714[电子电信—信息与通信工程]