电测与仪表Issue(13)：20-24,5.
基于改进阈值去噪的谐波检测
Harmonic detection based on improved threshold de-noising
摘要
Abstract
In order to guarantee the safe operation of power system, its harmonics must be accurately detected and an-alyzed.Signals in the power system not only consist of fundamental wave but also include harmonics and noises, which seriously affect the harmonic detection precision.In view of the shortcomings of traditional soft threshold and hard threshold de-noising methods, this paper provides an improved wavelet threshold de-noising method based on sym8. Firstly, the signals are decomposed to 5 layers with sym8 wavelet.Secondly, detail coefficients of the first and second layer are de-noised and optimized.Finally, based the optimized coefficients of each layer, the signals are reconstruc-ted and harmonics are detected.On the Matlab platform, the de-noising effects of the soft threshold, the hard thresh-old and the improved threshold we proposed are compared.The result shows that the de-noising effect of improved threshold method is better, and the accuracy of harmonic detection is obviously improved.关键词
谐波/小波变换/阈值去噪/检测Key words
harmonic/wavelet transforms/threshold de-noising/detection分类
信息技术与安全科学引用本文复制引用
王晴晴,黄友锐,陈珍萍,曲立国,李男..基于改进阈值去噪的谐波检测[J].电测与仪表,2015,(13):20-24,5.基金项目
国家自然科学基金资助项目（51404008）；安徽高校省级自然科学研究重点项目 （）
