有源滤波器中改进型自适应谐波电流检测算法

An Improved Adaptive Harmonic Current Detection Algorithm in Active Filter

针对现有变步长最小均方(LMS)算法在谐波电流检测方面存在的不足,文章提出了一种应用于有源滤波器的改进型自适应谐波电流检测算法。其通过误差信号在原始输入信号所占比例的相关平均估计来消除谐波电流对步长更新的干扰,提高了检测精度;同时,通过对改进算法收敛条件和稳态性能的分析,进一步阐述了本算法在快速收敛性和较小稳态误差方面的优越性。仿真结果表明,该算法在有源滤波器谐波电流检测性能方面达到了预期的优化目标。

It proposed an improved adaptive harmonic current detection algorithm for active filter based on the shortcoming of the existing variable step-size LMS algorithm for harmonic current detection.The algorithm can eliminate the interference attributed by harmonic current to step updating and improve detection accuracy by correlating average ratio estimation of original input signal in error signal.At the same time,through further analysis of its convergence condition and steady state performance,it described the advantage of this algorithm in fast convergence and small steady-state error.Simulation results show that the proposed algorithm achieves the expected performance in harmonic current detection.