摘要
为了改善暂态电能质量扰动信号的消噪效果,提出了一种小波包改进阈值的消噪方法。在分析了软阈值消噪方法和硬阈值消噪方法的基础上,对阈值量化函数进行了改进,并通过小波包变换对消噪效果进行了强化。改进后的新阈值消噪法能有效克服"硬阈值法不连续、软阈值法有偏差"的缺点。对暂态电能质量扰动信号消噪处理的仿真结果表明,该新方法在消噪的同时能够减少信息的损失,在不同信噪比下都能有效地去除白噪声,其消噪效果优于软阈值函数消噪法。
In order to enhance the de-noising effect of transient power quality disturbance signals,a wavelet package improved threshold de-noising method was put forward.Based on analzing the de-noise method of soft threshold and hard threshold,the thresold quantization fuction was improved.The new de-noising method can overcome the discontinuity of the hard threshold and the offset of the soft threshold.The simulation results of transient power quality disturbance signal de-noising show that the new method can not only reduce the loss of useful information while de-noising,but also effectively de-noise white noise under different SNRs.The de-noising effect is superior to the soft threshold function.
出处
《机电工程》
CAS
2011年第8期1012-1014,1018,共4页
Journal of Mechanical & Electrical Engineering
关键词
电能质量扰动
小波包变换
改进阈值
power quality disturbance
wavelet package transform
improved threshold
