用于有源滤波器的一种新型谐波检测算法

传统的谐波电流检测方法有很多缺点.本文根据信号处理中的自适应噪声抵消技术,提出了一种改进的自适应谐波电流检测方法.它采用一种新的变步长LMS（最小均方）算法,可以更加灵活地控制系统的收敛速度和稳态检测精度,无需折中选择两者.而且这种方法能有效调节步长,不受谐波电流的干扰.该方法增加的计算量很小,容易实现.仿真和实验结果亦证明了这种谐波电流检测方法的有效性.

Novel Harmonic Detecting Algorithm applied to Active Power Filters

The conventional detecting methods for harmonic currents have various limitations.In this paper,according to the adaptive noise canceling technology in the signal processing,an improved adaptive algorithm of detecting harmonic currents is presented.It adopts a new variable step size least mean square(LMS) method allowing more flexible control of misadjustment and convergence time without the need to compromise one for the other.Moreover,the algorithm can effectively adjust the step size while maintaining the immunity against harmonic current disturbance.Meanwhile the additional calculation is very little,so the algorithm presented is easy to implement.The simulation and experiment results illustrate that the performance of the proposed approach is satisfactory.