摘要
小波变换(WT)具有可变的时-频窗口,能够聚焦信号的任意细节,适用于非稳态及瞬变信号的分析和处理,但因存在小波混叠现象,导致其分析的精度低、鲁棒性差。针对db20小波消失矩阶数大的特性和良好的频带划分效果,同时为满足电力系统谐波有效分析的要求,提出基于db20小波变换抗混叠的谐波分析方法。该方法首先将信号按频带分解成子频带信号,再利用连续小波变换分析子频带信号,获取谐波信息。经Matlab仿真表明,所提方法能够有效地分析电力系统谐波信号。
Wavelet transform(WT)with variable time-frequency window can focus on any details of the signal and is suitable for the research and analysis on non-steady state and transient signals,but the presence of wavelet aliasing phenomenon leads to the low accuracy and poor robustness for harmonic analysis.Since the db20 wavelet has the characteristics of high-order vanishing moments and perfect effect for frequency band division,the harmonic analysis method based on db20 anti-aliasing wavelet transform is proposed to meet the requirement of power system for effective harmonic analysis.The method is used to decompose the signal into sub-band signals according to the frequency bands,and then the continuous wavelet transform is used to analyze the sub-band signals to acquire the harmonic information.The simulation results of Matlab show that the proposed method can analyze the harmonic signal of power system effectively.
作者
康家玉
曹志威
王旭
刘甲琛
KANG Jiayu;CAO Zhiwei;WANG Xu;LIU Jiachen(College of Electrical&Information Engineering,Shaanxi University of Science&Technology,Xi’an 710021,China)
出处
《现代电子技术》
北大核心
2018年第19期49-53,共5页
Modern Electronics Technique
基金
陕西省科技厅工业攻关项目(2015GY038)~~
