基于卷积矩形窗的电子式互感器测量算法  

Electronic instrument transformer measurement algorithm based on convolution rectangular window

作　　者：陈锐民[1] 谭磊[1] 孔政敏[1] 方彦军[1] 

机构地区：[1]武汉大学动力与机械学院,湖北武汉430072

出　　处：《武汉大学学报（工学版）》2014年第2期255-259,共5页Engineering Journal of Wuhan University

基　　金：国家863计划项目(编号:2009AA12Z311);国家自然科学基金项目(编号:60772107;40776048)

摘　　要：针对电子式互感器测量算法中的频谱泄露现象和栅栏效应,提出了一种基于卷积矩形窗的离散傅里叶变换(CRW-DFT)算法作为测量算法以提高电子式互感器测量精度,利用矩形窗的卷积运算构造了卷积窗函数,并完成了谐波幅值、相位计算公式的推导和分析.对基于卷积矩形窗的CRW-DFT算法进行MATLAB仿真实验,结果表明卷积窗在整数倍频率附近的谱泄漏效应均低于同宽度的其他现有窗函数,表明该算法能够有效减小频谱泄漏和栅栏效应对测量结果的影响,当其用于具有较小同步误差的谐波分析时,非同步采样引起的测量误差将最小,能够有效地提高电子式互感器测量的精确度.To solve the spectrum leak phenomenon and fence effect of electronic instrument transformer measurement algorithm, we proposed a discrete Fourier transform algorithm based on convolution rectangular window （CRW-DFT） as a measurement algorithm to improve the measurement accuracy of electronic transformers; convolution window function is formed by convolution operation of rectangular window; and calculation formulas of harmonic amplitude and phase are derived and analyzed. The algorithm based on convolution rectangular window CRW-DFT was simulated by MATLAB. The simulation results show that the convolution window near the integer times frequency spectrum leakage effect than other existing win- dow function with width; they show that the affect of spectrum leak phenomenon and fence effect are effectively reduced by the proposed algorithm; when it is used for synchronization with smaller error of harmonic analysis, the measuring error caused by the non-synchronous sampling will be minimal; the measurement accuracy of electronic instrument transformer is improved effectively.

关 键 词：电子式互感器 傅里叶变换 卷积矩形窗 

分 类 号：TM934[电气工程—电力电子与电力传动]