Study of Voltage Sag Detection Method Based on Double Wavelet with Anti-Interference Feature

doi:10.11985/2018.04.005

Abstract

Abstract:

In view of the poor analytical accuracy and weak real-time performance caused by signal noise and harmonic wave exist in the voltage sag detection, a comprehensive voltage sag detection method is proposed to weaken the impact of the interference signals by the double wavelet analysis. This method decomposes the signal at multi-scale with db20 wavelet to catch the fundamental wave, and then decomposes the fundamental wave at single-scale with db10 wavelet to detect the modulus maximum of high-frequency components. The proposed method can suppress the interference signal and improve the performance of voltage sag detection by wavelet analysis.

Key words: Voltage sag, wavelet analysis, double wavelet, noise, harmonic wave

CLC Number:

TM727

Xu Dan,Huang Lijun,Yang Xiaohui,Li Xianwei,Wang Yi,Li Bo. Study of Voltage Sag Detection Method Based on Double Wavelet with Anti-Interference Feature[J]. Journal of Electrical Engineering, 2018, 13(4): 32-37.

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参数	数值
电压幅值/频率	220V/50Hz
谐波	3、13次谐波
白噪声	最大幅值为1V
电压暂降(%)	60
暂降起止时刻/s	0.2~0.5
采样频率/Hz	3 200
小波函数	db10
分解尺度	4