摘要
有效去除继电保护信息采集中的噪声,对确保继电保护装置正确动作至关重要。对电力系统接地短路电流信号的去噪进行了研究,针对小波去噪等信号处理方法中存在的Gibbs现象,提出并研究了采用db4小波进行信号去噪,采用平移不变小波变换,并以新型阈值代替传统阈值,进一步改善了去噪效果。工程实际应用中,采用间隔循环平移可提高运算速度,理论分析及仿真实验均验证了该方法的有效性。
Enlargement of modern power systems makes the fault conditions more complicated and so how to de-noise the signal to enable the relay protection device act correctly becomes very important.The de-noising of short-circuit current in the power system is studied.The db4 wavelet was applied in signal de-noising and the translation invariant wavelet was used to eliminate the Gibbs phenomenon.To improve the de-noising effect,the traditional threshold was replaced by the new one.In engineering applications,the alternation of the cycle spinning is better because of its fast calculation speed.Theoretical analysis and simulations validate the method effective.
出处
《华东电力》
北大核心
2008年第9期21-23,共3页
East China Electric Power
基金
教育部霍英东青年教师基金资助项目(101060)
四川省杰出青年基金项目(07ZQ026-012)
关键词
信号去噪
Gibbs现象
平移不变
阈值法
循环平移法
signal de-noising
Gibbs phenomenon
translation invariant
threshold
cycle-spinning method
