摘要
在比较现有几种电能质量分析方法的基础上,提出了对于谐波分析使用Blackman-Harris加窗傅立叶变换及短时扰动分析使用Daubechies小波变换的综合分析方法.仿真结果表明,该方法在时域和频域均具有良好的检测性能,能够准确得到谐波的频率和相位,刻画出信号的奇异性变化特点,确知短时干扰的发生时刻和受扰程度.
In this paper, application of windowed FFT and multi-resolution wavelet decomposition on analysis of power quality is illustrated. On the base of deep comparison among several methods for power quality analysis, a comprehensive analysis method is proposed Blackman- Harris windowed FFT is recommended for application on harmonic detection and Daubechies wavelet for the use on short duration variations analysis. The simulation results demonstrate that the method adopted has good performances in both time and frequency domains. With the method, the harmonic frequencies and phases can be obtained accurately, the singularity characteristics are presented clearly, and occurring-time and degree of disturbance can be informed.
出处
《江南大学学报（自然科学版）》
CAS
2007年第4期403-408,共6页
Joural of Jiangnan University (Natural Science Edition)
关键词
电能质量
加窗傅立叶变换
小波变换
多分辨率分析
谐波检测
暂态干扰
power quality
windowed FFT
wavelet transform
multi-resolution analysis
harmonic detection
transient disturbance
