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Indexed by:期刊论文

Date of Publication:2017-11-01

Journal:INTERNATIONAL TRANSACTIONS ON ELECTRICAL ENERGY SYSTEMS

Included Journals:SCIE、EI

Volume:27

Issue:11

ISSN No.:2050-7038

Key Words:blind source separation; empirical-mode decomposition; harmonics; independent component analysis; single-channel ICA; subharmonics

Abstract:Harmonics and subharmonics in power systems distort grid voltage, reduce the quality of power, and affect the security of the power grid. Rapid and accurate harmonic separation from grid voltage is the crucial technology to ensure that power systems operate safely and stably. The blind source separation method based on independent component analysis has been used to separate the components of grid voltage. As the grid voltage is acquired in only a single channel, harmonic separation from it is classed as a single-channel independent component analysis problem. Hence, this paper proposes a method for the harmonic separation of single-channel grid voltage that combines ensemble empirical-mode decomposition and FastICA. Compared with 2 traditional methods, the fast Fourier transform and the discrete wavelet transform, the proposed method is superior in that it does not require prior knowledge of the frequency of the original source, does not feature mode mixing, and is more robust against noise. Results obtained from both synthetic and real-life signals demonstrated the excellent performance of the proposed method.