Title :
Detection of voltage flicker based on hilbert transform and wavelet denoising
Author :
Tong, Weiming ; Yuan, Shuai ; Li, Zhongwei ; Song, Xuelei
Author_Institution :
Dept. of Electr. Eng. & Autom., Harbin Inst. of Technol., Harbin
Abstract :
Precise detection is very important for monitoring and controlling voltage flicker efficiently. As voltage flicker can be regarded as a narrowband signal, this paper proposed a novel detecting method based on Hilbert transform and wavelet denoising. By Hilbert transform, the flicker envelope can be extracted while higher harmonics and other noises contained in voltage flicker can be eliminated by Daubechies-8 wavelet. Simulation results showed that the higher harmonics and other noises could be filtered and amplitude and frequency of the modulation signal could be calculated precisely. Therefore, this detection method can be widely applied to developing intelligent and digital flickermeters.
Keywords :
Hilbert transforms; power supply quality; wavelet transforms; Hilbert transform; digital flickermeters; voltage flicker detection; wavelet denoising; 1f noise; Frequency; Monitoring; Narrowband; Noise level; Noise reduction; Power harmonic filters; Voltage control; Voltage fluctuations; Wavelet transforms; Hilbert transform; Voltage flicker; wavelet denoising;
Conference_Titel :
Electric Utility Deregulation and Restructuring and Power Technologies, 2008. DRPT 2008. Third International Conference on
Conference_Location :
Nanjuing
Print_ISBN :
978-7-900714-13-8
Electronic_ISBN :
978-7-900714-13-8
DOI :
10.1109/DRPT.2008.4523792