摘要
文章应用基于经验模态分解(EMD)和Hilbert谱分析的Hilbert-Huang变换,进行电压波动与闪变信号的分析与检测,并对应用中的一些问题进行了探讨;应用研究表明,对暂态闪变信号进行EMD分解,再对得到的各IMF分量求HHT谱,可以精确地检测到暂态电压波动发生的时刻和终止的时刻;采用Hilbert-Huang变换进行电压闪变调幅波信号的包络解调,可以避免电网工频高次谐波对解调的影响,从而提高闪变分析的精度;所作的一些尝试表明,应用Hilbert-Huang变换分析电压闪变信号是可行的和有效的。
The empirical mode decomposition （EMD） and Hilbert spectrum analysis are introduced to analyze and detect voltage fluctuation and flicker signals some problems in the application are also discussed. In order to accurately detect the beginning and end time of transient fluctuation, the voltage signal is decomposed into intrinsic mode function （IMF） elements by EMD, and then, their Hilbert spectrum are calculated. Moreover, Hilbert--Huang Transform （HHT） is employed to demodulate the flicker voltage amplitude--modulated envelope, therefore, the effect of harmonics is avoided and the precision of flicker analysis is improved. Simulation and application show the availability and effectiveness of the proposed methods on analyzing voltage fluctuation and flicker.
出处
《计算机测量与控制》
CSCD
2006年第6期707-709,756,共4页
Computer Measurement &Control
基金
湖南省电力科技攻关项目(20030301)
