一种基于自适应理论的谐波检测算法  

A new harmonic detection algorithm based on adaptive theory

作　　者：彭咏龙[1] 黄江浩 李亚斌[1] 杜鹏 宋世光 PENG Yonglong;HUANG Jianghao;LI Yabin;DU Peng;SONG Shiguang(School of Electrical and Electronic,Engineering,North China Electric Power University,Baoding 071003,China;State Grid Chongqing Electric Power Company Bishan Power Supply Branch,Chongqing 400000,China)

机构地区：[1]华北电力大学电气与电子工程学院,河北保定071003 [2]国网重庆市电力公司璧山供电分公司,重庆400000

出　　处：《黑龙江电力》2018年第5期381-385,共5页Heilongjiang Electric Power

摘　　要：为进一步改善有源滤波器(active power filter,APF)的滤波效果,基于最小均方误差理论,提出了一种变步长LMS/LMF谐波电流检测新算法,采用寻求目标函数最优和归一化的方法,通过权向量对步长的偏导估计并结合误差回馈信号的相干时间均值估计共同完成对步长参数的动态调节,并根据输入信号的特点自适应地调节阈值来实现LMS/LMF算法的自动切换,使得算法在便于控制动态参数的同时,不仅有效避免了高次谐波电流对步长更新迭代造成的干扰,而且更好地权衡了算法快速收敛和低稳态失调的矛盾。最后,该算法在仿真及实验中得到了有效验证。In order to further improve the filtering effect of active power filter, a new variable step size LMS/LMF algorithm for harmonic current detection is proposed based on the theory of minimum mean square error, The method of finding the optimal and normalized target function is adopted. The dynamic adjustment of step length parameters is realized by weight vector partial derivative estimation and coherent time mean estimation of error feedback signal. The automatic switching of LMS/ LMF algorithm is realized by adjusting the threshold value adaptively according to the characteristics of the input signal. The algorithm can not only avoid the interference of high harmonic current on step length update iteration, but also control dynamic parameters. Meanwhile it has a better balance between the fast convergence and low steady-state maladjustment. Finally, the new algorithm gets validated effectively by the simulation and experiment.

关 键 词：有源滤波器 变步长LMS/F算法 谐波检测 代价函数 相干平均估计 

分 类 号：TM714[电气工程—电力系统及自动化]