摘要
为提高电能质量,对电网谐波进行补偿与抑制,其效果取决于谐波检测的精度和动态响应特性。考虑电网负载电流的低信噪比特性,提出一种新的变步长MLMS谐波检测算法。该算法在权系数的迭代公式中加入动量项,且利用误差信号的时间均值估计来控制步长更新,使得谐波检测过程既有较快的动态响应速度,又有较高的检测精度。最后对变步长MLMS算法进行仿真及实验分析,验证了该算法的有效性。
In order to improve the quality of electric energy, the harmonic of power grid is restrained and compensated, whose effects are determined by detection precision and dynamic response characteristics. Con- sidering the low signal-to-noise ratio of load current, a novel variable step-size MLMS algorithm of harmonic current detection was introduced, which adds a momentum factor to weigh factors＇ iterative formula, and uses the estimation of the time-average of error signal to control the updating of the step-size. It can provide a fast dynamic response while ensuring high detecting precision. At last, the simulation and experiment results verify the effectiveness and practicability of the novel variable step-size MLMS algorithm.
出处
《电气传动》
北大核心
2009年第2期44-47,共4页
Electric Drive
基金
江苏省高新技术基金(GB2004024)
江苏大学高级人才专项基金(07JDG072)
江苏省镇江市攻关项目基金(GY2005006)
