摘要
针对傅里叶变换的谐波检测方法无法同时实现时-频变域分析这一缺点,提出了小波变换这一新方法对谐波进行分析。通过小波变换对电力系统中的谐波电流进行分解,得到信号的基波分量和高次谐波分量。针对电力系统中的突变信号,提出了基于小波变换的模极大值的奇异性检测方法,通过小波变换模的极值点在多尺度上的综合表现,来表示信号的突变特征,并通过仿真实例验证该算法的有效性。
Aiming at the disadvantage of Fourier transform against the harmonic measurement methods can not be realized at the same time-changed the frequency domain analysis,the wavelet transform as a new method of harmonic analysis,is proposed.The fundamental components and higher harmonic components are obtained by means of wavelet transform in power system.According to the characteristics of the abrupt signal of power system,the abnormal detection based on modulus maximum value of wavelet transform is proposed.The break characteristic of the disturbance signal can be expressed by modulus maximum value point of wavelet transform in multi-scale.The simulation examples validate the effectiveness of the method.
出处
《国外电子测量技术》
2010年第12期73-75,共3页
Foreign Electronic Measurement Technology
