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一种基于Chirp-Z变换的闪变测量方法

, PP. 209-215

Keywords: 电压波动,闪变,Chirp-Z变换,电能质量

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Abstract:

对IEC推荐的闪变测量方法进行分析后发现,如果波动分量的频率和幅值已知,则瞬时闪变视感度S可以直接由其得出,本文在此基础上提出了一种新的闪变测量方法。首先使用平方检波法提取出产生闪变的波动信号,对其进行线性调频Z变换(Chirp-ZTransform,CZT)得出波动分量的幅值和频率,然后根据波动分量的幅值和频率求出瞬时闪变视感度。使用CZT进行波动分量的提取,可以在不延长采样时间的前提下获得比快速傅里叶变换(FFT)更高的频率分辨率,有效降低了频谱泄漏造成的误差。通过仿真和试验对IEC方法和本文提出的方法进行了比较,结果证明了本文所提方法的正确性和有效性。

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[23]  作者简介
[24]  李和明 男, 1956年生, 教授, 博士生导师, 主要研究方向为电力电子与电力传动、大型发电机在线检测与故障诊断技术的研究。
[25]  康 伟 男, 1977年生, 博士研究生, 主要研究方向为电能质量监测。
[26]  (上接第208页)
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[28]  张介秋, 梁昌洪, 韩峰岩, 等. 介质损耗因数的卷积窗加权算法[J]. 电工技术学报, 2005, 20(3): 100-104.

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