中文摘要：

调幅波和间谐波都会引起电压的幅值波动,检测闪变时必须考虑高次谐波的影响和间谐波带来的波动,而常用的闪变检测方法无法直接对包络线分析得到闪变参数.文中提出了一种基于极值点插值的电压闪变信号包络线检测方法,通过寻找极值点、极值点筛选和三次样条插值得到电压波动信号的包络线,使得提取的包络线只包含闪变分量,不受高次谐波的影响,能同时反映调幅波和间谐波所引起的波动,对提取的包络线进行高精度FFT可以直接得到精确的闪变参数.

英文摘要：

The amplitude modulation signals and interharmonics can both cause the voltage amplitude fluctuation,thus the flicker detection must take the impact of high order harmonics and interharmonics into account.However,conventional flicker detection methods can not obtain the flicker parameters from voltage envelope analysis.This paper presents a novel envelope detection method of voltage flicker signals on the basis of interpolation of extreme points.The proposed method extracts the envelope of the voltage fluctuation signal by finding the extreme points,the extreme point filtering and the cubic spline interpolation.The envelope contains only the flicker components,and cannot be impacted by high harmonics,hence reflect the amplitude fluctuation caused by amplitude modulation signals and interharmonics.Accurate flicker parameters can be obtained directly by high precision FFT of the envelope.