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电网技术  2012 

一种时频混合方法用于谐波间谐波在线监测

, PP. 229-234

Keywords: 时频混合,加强锁相环,插值快速傅里叶变换

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Abstract:

为了检测靠近基波和谐波的间谐波,提出了一种时频混合方法来分析谐波和间谐波。首先在时域上通过并联的加强锁相环结构进行基波与谐波检测,该结构通过主锁相环测量幅值较大的基频分量,并将测得的基频输入到并行的子锁相环结构以完成对各谐波分量的分离;然后在频域上对分离所得的只含间谐波的信号使用插值快速傅里叶变换的方法进行分析,能在排除基波与谐波频谱泄漏影响的情况下得到靠近基波和谐波的间谐波的精确参数。在LabVIEW上实现了基于所提方法的谐波、间谐波在线监测平台,仿真和实验证明了所提方法的有效性。

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