abstract

• This work presents a model-based frequency-locked loop (FLL) for three-phase systems subject to unbalance and harmonic distortion conditions. It is based on a pretty general model of a three-phase AC reference signal comprising a set of harmonic oscillators. Likewise, the proposed synchronization scheme comprises a set of adaptive harmonic oscillators to estimate the corresponding harmonic components. The proposed scheme considers three different types of harmonic oscillators that distinguish among the sequences involved on each harmonic component, which leads to a less demanding computational effort. The harmonic oscillators of higher order are grouped in a harmonic compensation mechanism dedicated to coping with the harmonic content of the reference signal. Therefore, the main contributions of this work are (i) the incorporation of a complex gain to accelerate the dynamic response of the scheme, (ii) the derivation of sequence-specific oscillators, and (iii) the stability analysis based on Lyapunov%27s approach, which shows that the proposed scheme is globally stable provided the bandwidth of the frequency estimator is bounded. © 2013 IEEE.
• This work presents a model-based frequency-locked loop (FLL) for three-phase systems subject to unbalance and harmonic distortion conditions. It is based on a pretty general model of a three-phase AC reference signal comprising a set of harmonic oscillators. Likewise, the proposed synchronization scheme comprises a set of adaptive harmonic oscillators to estimate the corresponding harmonic components. The proposed scheme considers three different types of harmonic oscillators that distinguish among the sequences involved on each harmonic component, which leads to a less demanding computational effort. The harmonic oscillators of higher order are grouped in a harmonic compensation mechanism dedicated to coping with the harmonic content of the reference signal. Therefore, the main contributions of this work are (i) the incorporation of a complex gain to accelerate the dynamic response of the scheme, (ii) the derivation of sequence-specific oscillators, and (iii) the stability analysis based on Lyapunov's approach, which shows that the proposed scheme is globally stable provided the bandwidth of the frequency estimator is bounded. © 2013 IEEE.

authors

• Escobar G.
• Guillen D.
• Hernández-Gómez M.
• Martínez Rodríguez Pánfilo Raymundo
• Valdez-Resendiz J.E.

publication date

• 2021-01-01

published in

• IEEE Access  Journal

keywords

• complex gain; Frequency-locked loop; harmonic distortion; stability analysis; unbalance Frequency estimation; Harmonic distortion; Locks (fasteners); Oscillators (electronic); Signal processing; Complex gain; Frequency locked loops; Harmonic oscillators; Harmonics distortion; Power harmonic filters; Stability analyze; Unbalance; Harmonic analysis

Digital Object Identifier (DOI)

• 10.1109/ACCESS.2021.3131129

PubMed ID

start page

• 158710

end page

• 158725

volume

• 9

issue