一种改进ip-iq谐波电流检测算法

摘要

In order to improve the detection speed and accuracy of harmonic current in the three - phase power system,an improved harmonic current detection algorithm based on the instantaneous reactive power theory is proposed. A new variable step -size least mean square (LMS) adaptive filter is used as the low -pass filter in the detection circuit, the step - size can be adjusted by means of the normalized autocorrelation estimation of two error signals. Compared with the conventional ip -iq algorithm, the proposed method has a faster dynamic response without reducing the detection accuracy. The theoretical analysis and simulation results prove that the proposed harmonic current detection algorithm is correct and effective.%为了更加快速、精确地检测出三相电力系统中谐波电流,基于瞬时无功功率理论,提出了一种改进谐波电流检测算法.该算法利用一种变步长LMS算法来实现ip-iq理论中低通滤波器的功能,用当前误差信号和上一次误差信号归一化的自相关估计来进行步长迭代.与传统ip-iq算法相比,该算法在不降低检测精度的前提下,具有更快的动态响应性能.理论分析和基于Matlab的仿真实验验证了该谐波电流检测算法的正确性和有效性.