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基于间谐波泄漏估算的谐波间谐波分离检测法

, PP. 183-191

Keywords: 谐波间谐波检测,离散傅里叶变换,快速傅里叶变换,频谱干扰,时域平均

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Abstract:

某次谐波附近存在间谐波时,信号会发生闪变。本文以IEC61000-4-7推荐的测量环境为前提,提出了一种频谱分离法用于检测谐波及引起闪变的主导间谐波。首先研究了同步采样下谐波、间谐波之间的频谱干扰特性;根据间谐波离散频谱泄漏的特点,利用谐波频点左右谱线,通过变量重组,估算其在谐波频点上的泄漏值;用泄漏值修正原始频谱得到准确的谐波参数;原始信号减去重采样后的拟谐波信号得拟间谐波信号,通过时域补零或CZT求得间谐波参数。仿真算例和实测分析表明,该方法能够有效地分离信号中的谐波和间谐波成分、抑制它们之间的频谱干扰;当某一间谐波与谐波频率差小于5Hz时,仍能较为准确地提取出其中的间谐波参数。方法1方法2方法3方法4方法1方法2方法3方法4方法1方法2方法3方法4

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