计算机工程与应用Issue(20)：198-202,212,6.DOI:10.3778/j.issn.1002-8331.1504-0160
微电网HHT谐波检测与时频分析方法
HHT harmonic detection and time-frequency analysis method in microgrid
摘要
Abstract
In order to solve the problem to accurately detect complex non-stationary signals, such as micro-grid harmonic and mutation, a method based on Hilbert-Huang Transform(HHT)is presented. The method is about harmonic detection and time-frequency analysis for micro-grid. It fits extreme value curve by adopting shape-preserving piecewise cubic Her-mite interpolation, and implements Empirical Mode Decomposition(EMD)on harmonic signals, then a finite number of Intrinsic Mode Components(IMF)are obtained, and Hilbert transformation is conducted. The instantaneous frequency and amplitude of each IMF components are calculated finally. The time-frequency characteristics of micro-grid harmonic in non-stationary power signals are detected accurately. The simulation results show that the method can quickly and pre-cisely obtain the harmonic signal frequency components, amplitude and voltage mutation time. Compared with FFT and traditional HHT methods, it has higher accuracy and obvious time distinguishing feature, which meets the engineering application requirements for micro-grid harmonic computer detection.关键词
微电网/谐波检测/希尔伯特-黄变换(HHT)/经验模态分解/瞬时频率Key words
microgrid/harmonic detection/Hilbert-Huang Transform(HHT)/empirical mode decomposition/instanta-neous frequency分类
信息技术与安全科学引用本文复制引用
关维国,姚清志,鲁宝春..微电网HHT谐波检测与时频分析方法[J].计算机工程与应用,2015,(20):198-202,212,6.基金项目
辽宁省博士科研启动基金资助项目（No.20131045）；辽宁省教育厅科学研究资助项目（No.L2012218）。 （）
