Application of VMD and Hilbert Transform Algorithms on Detection of the Ripple Components of the DC Signal

Derong Luo, Ting Wu, Ming Li, Benshun Yi and Haibo Zuo
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Derong Luo: College of Electrical and Information Engineering, Hunan University, Changsha 410082, China
Ting Wu: College of Electrical and Information Engineering, Hunan University, Changsha 410082, China
Ming Li: Zhejiang Institute of Metrology, Hangzhou 310018, China
Benshun Yi: School of Electronic Information, Wuhan University, Wuhan 430072, China
Haibo Zuo: State Grid Yangzhong County Electric Power Supply Company, Yangzhong 212200, China

Energies, 2020, vol. 13, issue 4, 1-20

Abstract: Accurate detection of ripple components of the direct-current (DC) signals is essential for evaluating DC power quality. In this study, the combination algorithm based on variational mode decomposition (VMD) and Hilbert transform (HT) is applied to detect and analyze the characteristics of the ripple components of the DC disturbance signals. Firstly, the optimal modal number of VMD algorithms is comprehensively determined by observing the center frequencies of the mode components and the Index of Orthogonality (IO) of mode components. Through utilizing the VMD algorithm, the DC disturbance signal is accurately decomposed into a series of amplitude modulation-frequency modulation (AM-FM) functions. Then, the HT algorithm is applied to each AM-FM function to obtain the corresponding instantaneous amplitude and frequency, and the characteristics of DC disturbance signal are determined. Some case studies are implemented to analyze the ripple components of the DC disturbance signal with the VMD-HT and empirical mode decomposition (EMD) algorithm. Finally, the experiment results of Gree Photovoltaic Cabin have verified the feasibility and effectiveness of the proposed combination VMD-HT algorithm by comparison with EMD and the window interpolation fast Fourier transform (WIFFT) algorithms.

Keywords: DC disturbance signal; variational mode decomposition; Hilbert transform (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2020
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (2)

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