Fourier-based PLL applied for selective harmonic estimation in electric power systems.
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Date
2013
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Abstract
In this paper, the Fourier-based PLL (Phase-locked Loop) is introduced with a new structure, capable of selective harmonic
detection in single and three-phase systems. The application of the FB-PLL to harmonic detection is discussed and a new model
applicable to three-phase systems is introduced. An analysis of the convergence of the FB-PLL based on a linear model is presented.
Simulation and experimental results are included for performance analysis and to support the theoretical development. The
decomposition of an input signal in its harmonic components using the Fourier theory is based on previous knowledge of the signal
fundamental frequency, which cannot be easily implemented with input signals with varying frequencies or subjected to phase-angle
jumps. In this scenario, the main contribution of this paper is the association of a phase-locked loop system, with a harmonic
decomposition and reconstruction method, based on the well-established Fourier theory, to allow for the tracking of the fundamental
component and desired harmonics from distorted input signals with a varying frequency, amplitude and phase-angle. The application
of the proposed technique in three-phase systems is supported by results obtained under unbalanced and voltage sag conditions.
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Keywords
Fourier series, Harmonic detection, Phase-locked loop
Citation
SANTOS, C. H. G. dos et al. Fourier-based PLL applied for selective harmonic estimation in electric power systems. Journal of Power Electronics, v. 13, p. 884-895, 2013. Disponível em: <http://koreascience.or.kr/article/JAKO201329063579229.page>. Acesso em: 28 jul. 2017.