为解决常规LMS自适应算法在电网畸变电流检测中存在收敛速度和稳态误差之间的矛盾，本文提出了一种增强型LMS自适应算法。该算法通过对输入信号环节进行预置带通滤波处理，改善信号的自相关数值，实现了基波处的幅值无衰减且相位无延时，同时通过对LMS算法权值和误差环节嵌入低通滤波拓扑结构，达到了降低畸变电流波动的目的。最后在对常规算法与增强型LMS算法分析比较的基础上，通过仿真和实验证明了本文理论分析的可行性，验证了此算法在畸变电流检测中的有效性和准确性。%In order to solve the contradiction between the convergence rate and steady-state error of conventional LMS algorithm, an improved LMS algorithm is proposed in this paper .The contributions of this paper are:(1) the proposed method applies the preset band-pass filter into the input signal link to improve the value of the autocorrela-tion of the input signal with no weakening of amplitude and no delay of phase in fundamental wave ; ( 2 ) the low pass filter topology structure is imbedded into the algorithm weights of LMS and error link to reduce the fluctuation of aberrant current .The simulation results of the proposed method show that the proposed method has a faster con-vergence rate and less error .Based on the comparison between the proposed method and the conventional methods , the theory analysis in this paper is demonstrated to be feasible and the proposed method is proved to be more effec -tive and accurate .
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