电测与仪表2017，Vol.54Issue(24)：1-6,16,7.
一种基于小波包变换的电力系统谐波检测方法
A harmonic detection method for power system based on wavelet packet transform
摘要
Abstract
As the widely use of the non-linear equipment and distribution generation,the harmonic pollution is becoming increasingly severe.Harmonic detection is a major topic in power quality(PQ) analysis.In this paper,a harmonic detection method based on wavelet packet transform is proposed.This algorithm is based on the five-layer db40 wavelet packet transform (WPT).In order to reduce wavelet aliasing in the middle band,and the Hilbert transform (HT) is used for frequency shift so that the harmonic components are transferred to the marginal band with a better accuracy.Then,the shifted signal is decomposed and reconstructed by the WPT for high-accuracy detection of the harmonics.Simulation of different algorithms and error analysis are also given in this paper.The simulation results show that this algorithm has a better ability of high-resolution time-frequency analysis and can detect the transient disturbance more effectively.Compared with the traditional Fourier transform,the measurement accuracy is also improved,which is more accurate than WPT,and the test results verify the feasibility and advantages of the proposed method.关键词
小波包变换/希尔伯特变换/谐波/电能质量Key words
wavelet packet transform/Hilbert transform/harmonics/power quality分类
信息技术与安全科学引用本文复制引用
肖厦颖,李开成,王凌云,孟庆旭,蔡得龙,罗奕..一种基于小波包变换的电力系统谐波检测方法[J].电测与仪表,2017,54(24):1-6,16,7.基金项目
国家自然科学基金资助项目(51277080) （51277080）
