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电网技术  2010 

用于变压器局部放电在线监测的改进NLMS自适应滤波算法

, PP. 165-169

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Abstract:

局部放电在线监测对大型电力变压器的安全稳定运行具有重要意义,监测的关键是从强干扰信号中提取微弱的局部放电脉冲信号。最小均方自适应滤波算法具有结构简单、性能稳定等优点,广泛应用于自适应噪声对消中,但其收敛速度与误差存在矛盾,不能同时得到满足。基于此,提出了改进的归一化最小均方自适应滤波算法,在计算输入信号功率时,引入了遗忘因子,并应用符号函数替代步长校正因子。该算法计算量小,较好地解决了收敛速度与误差的矛盾,在变压器局部放电在线监测中应用效果良好。

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