小波滤波在罗氏线圈互感器中的应用研究

Wavelet Filtering Algorithm Applied to Rogowski Coils Transformer

随着智能电网技术的发展,以电子式互感器和光电式电压/电流互感器为代表的非常规互感器得到了广泛的研究。简要分析了小波变换时频局部化能力及其相对于傅里叶变换的优点,介绍了罗氏线圈互感器的优点和缺点,针对罗氏线圈互感器输出数据存在的高斯白噪声干扰信号,基于小波变换的基本原理,介绍了小波阈值滤波算法中的常用阈值函数,并使用Matlab仿真软件研究了小波阈值滤波算法的特性。

With the development of smart grid technology, the non-conventional instrument transformer represented by electronic instrument transformer ＆ photoelectrical voltage/cur- rent instrument transformer has been studied extensively. The paper briefly analyzes the time-frequency localization ability of wavelet transformation ＆ its advantages compared with Fourier transformation and introduces the advantages and disadvantages of Rogowski coils. The gaussian white noise interference signal is produced when Rogowski coils transformer outputs data. For this, based on the wavelet transformation principle, this paper in- troduces the threshold function commonly used in wavelet threshold filtering algorithm, and uses Matlab simulation software to study the characteristics of the wavelet threshold filter- ing algorithm.