一种基于Hilbert和Chirp-Z变换闪变测量的改进方法  

An Improved Method of Flicker Measurement Based on Hilbert Transform and the Chirp-Z Transform

作　　者：帅旗[1] 金颖[1] 

机构地区：[1]华北电力大学电气与电子工程学院,北京102206

出　　处：《河北工程技术高等专科学校学报》2012年第2期48-51,共4页Journal of Hebei Engineering and Technical College Quarterly

摘　　要：为了对电压闪变,提出了一种基于Hilbert和Chirp-Z变换的改进算法。首先介绍了Hilbert变换和Chirp-Z变换的原理,并从理论上推导了用Hilbert变换提取闪变包络线的公式。然后指出波动分量为方波时不能直接应用频谱分析法,需要对基于Hilbert和Chirp-Z变换的测量方法进行改进。最后用算例对所提方法进行仿真验证,证明该方法的正确性。In order to make an accurate measurement for flicker, especially when the wave vector is a square wave signal generated by voltage flicker, an improved algorithm based on Hilbert transform and Chirp-Z transform has been proposed. Firstly, the theory of the Hilbert transform and the Chirp-Z transform is introduced. The formula of extracting the flicker envelope by the Hilberl： transform has been derived from the theory. In particular, by conveniently applying existing detection methods, larger error of the short-term flicker have been found when the wave vector was a square wave ,;ignal. According to this problem, an improved method was proposed. Finally, the correctness of the proposed method is verified by an example.

关 键 词：电压闪变 HILBERT变换 Chirp—Z变换 方波 

分 类 号：TM711[电气工程—电力系统及自动化]