关于供电系统电网谐波优化检测仿真  

Simulation of Power System Harmonic Optimization Detection

作　　者：张锐[1] 赵明伟 ZHANG Rui;ZHAO Ming-wei(College of Automation,Harbin University of Science and Technology,Harbin Heilongjiang 150080,China)

机构地区：[1]哈尔滨理工大学自动化学院,黑龙江哈尔滨150080

出　　处：《计算机仿真》2019年第3期142-146,共5页Computer Simulation

基　　金：黑龙江省自然科学基金(E2015062)

摘　　要：在复杂的供电系统中,电网谐波的优化可以提高电能质量。目前主要的电网谐波优化中,小波变换存在软硬阈值方法产生恒定偏差和导数不连续等缺点,傅里叶变换法又存在频谱泄漏和栅栏效应的现象。研究表明信号的中的噪声会对谐波检测产生较大影响,如何快速的准确的对电网谐波进行优化是目前研究的热点和难点。在小波变换的基础上提出一种改进的供电系统电网谐波优化算法,结合了经验模态分解和改进小波阈值的优势。针对特定的电网谐波进行优化检测,利用集合经验模态分解处理成多个固有模态函数,快速有效的提取出分界点,对模态函数采取改进阈值优化。MATLAB仿真结果表明该方法能优化电网谐波,验证了提出方法的准确性和有效性。In complex power supply system,the optimization of power grid harmonic can improve the electric energy quality.Currently,Fourier transform has the phenomenon of spectrum leakage and fence effect.The research shows that the noise in signal has a great influence on the harmonic detection.How to quickly and accurately optimize the power grid harmonic is a hot spot and difficulty.Based on the wavelet transform,this paper proposed an improved optimization algorithm of power grid harmonic in power supply system,which combined the advantages of empirical mode decomposition and improved wavelet threshold.Moreover,the given power grid harmonics were optimized and detected.After that,we used the ensemble empirical mode decomposition to process them into some intrinsic mode functions,so as to extract the boundary points quickly and effectively.Finally,we used the improved threshold to optimize modal function.MATLAB simulation results show that this method can effectively optimize power grid harmonics.Meanwhile,the accuracy and effectiveness of the improved optimization algorithm is verified.

关 键 词：集合经验模态分解 小波阈值 谐波检测 信噪比 均方误差 

分 类 号：TP301.6[自动化与计算机技术—计算机系统结构]