RO-SBM的希尔伯特—黄变换谐波检测方法

针对希尔波特-黄谐波检测方法的端点效应问题,提出斜率再优化(RO-SBM)与希尔伯特-黄变换(HHT)相结合的方法(RO-SBM-HHT),该方法先采用RO-SBM法对原信号延拓,按照包络原则对延拓之后的信号进行经验模态分解(EMD),得到本征模态函数IMF分量,然后对各个IMF分量进行希尔伯特变换(HT),并采用最小二乘拟合可获得各次谐波的幅值和频率。仿真与试验数据表明,RO-SBM-HHT可有效地解决谐波检测端点效应,提高检测精度、减少冗余分量。

Hilbert-Huang Transform Harmonic Detection Method Based on RO-SBM

Aiming at the endpoint effect problem of Hilbert-Huang harmonic wave detection method, a new method is presented by combining re-optimization slope based method (RO-SBM) with Hilbert transform (HHT). Firstly, the RO-SBM method was used to extend the original signal. According to the envelopment principle, the extended signal was carried out by EMD decomposition and the IMF was obtained. And then the Hilbert transform (HT) was performed on each IMF component. Finally, least square fitting was used to obtain the amplitude and frequency of each order harmonic wave. Simulation and test results show that the RO-SBM-HHT can effectively solve the endpoint effect of harmonic wave detection, improve detection accuracy and reduce redundant components.