摘要
谐波是影响电能质量的重要因素,谐波对电力系统和用电设备产生严重危害和影响。根据电网谐波中既存在稳态谐波分量又有暂态谐波分量的特点,依据小波分析具有对非平稳信号的分析和处理能力及多分辨率的特性,将小波变换理论应用于电网谐波检测中,提出了利用小波变换实现测量信号各次谐波的方法。仿真算例表明：小波包变换分析法能够正确地提取电力系统的谐波信号,将电流信号中的基波成分与高次谐波成分分离,验证了该方法的有效性。
Harmonic is an important influence on power quality in power system,which is harmful to the power system and power equipment.According to the characteristic of the power harmonic which includes steady and transient components,analytical ability and processing ability of wavelet analysis to unsteady signals and the characteristic of multi-resolution analysis,a method of wavelet transform was presented to detect the power harmonic.The theoretical basis for phase measurement of harmonic directly by wavelet transform was proposed.It is proved that the harmonic signal could be exactly extracted and separated the fundamental harmonic and high order harmonic by using the method of wavelet packet transform.Simulation validated the effectivity of the proposed method.
出处
《沈阳农业大学学报》
CAS
CSCD
北大核心
2010年第3期372-374,共3页
Journal of Shenyang Agricultural University
基金
沈阳农业大学中青年硕士研究生导师基金项目(2008)
关键词
电能质量
小波变换
谐波检测
power quality
wavelet packet transform
harmonic detection
