摘要
准确、实时地检测出电网中的谐波电流是保证有源电力滤波器(APF)具有良好工作性能的关键。文章提出了一种新的嵌入误差低通滤波器的变步长最小均方(Least—mean—squa re,LMS)自适应算法,该算法以检测后得到的反馈误差信号经低通滤波器与负载电流相邻的两基波周期之差的和作为反馈量来调整步长,有效地提高了系统的动态响应速度以及稳定后的检测精度。仿真实验证明了该算法的有效性和可行性。
It is the key for the performance of active power filter （APF） that harmonic currentin power system can be detected accurately and real timely. A novel variable step-size leastmean square （LMS） adaptive algorithm embedded error low pass filter is present. The sumof the result of the feedback error through a LPF and error of sampling current values withthe same phase in two adjacent fundamental cycles is used as the feedback amount toadjust step size, so this algorithm can effectively improve the convergence rate and ensurea high detecting precision. The simulation shows the validity and feasibility of the method.
出处
《变频器世界》
2014年第9期57-60,共4页
The World of Inverters
关键词
有源电力滤波器
低通滤波器
变步长
最小均方
Active power filter Low pass filter Variable step-size Least mean square
