Frequency-Locked Loop Based on a Repetitive Controller for Grid Synchronization Systems

The frequency-locked loop based on a second-order generalized integrator has been widely used in grid synchronization systems but featuring unfavorable harmonics filtering performance. To solve this issue, a frequency-locked loop based on multiple second-order generalized integrators was proposed, w...

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Bibliographic Details
Published in:IEEE access 2020, Vol.8, p.154861-154870
Main Authors: Geng, Jiayi, Li, Xue, Liu, Qing, Chen, Jianliang, Xin, Zhen, Loh, Poh Chiang
Format: Article
Language:English
Subjects:
Attenuation
Delays
Finite impulse response filters
fractional delay
Frequency estimation
Frequency locked loops
Frequency locking
Frequency synchronization
Frequency variation
Frequency-looked loop
Harmonic analysis
harmonic distortion
Harmonics
Integrators
Power system harmonics
quadrature-signal generator
repetitive control
Repetitive controllers
second-order generalized integrator
signal processing
Synchronization
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Summary:The frequency-locked loop based on a second-order generalized integrator has been widely used in grid synchronization systems but featuring unfavorable harmonics filtering performance. To solve this issue, a frequency-locked loop based on multiple second-order generalized integrators was proposed, which is to realize harmonics attenuation and frequency synchronization concurrently. Nevertheless, it is inconvenient for implementation for the complex structure and burdensome calculation. The target of this work is to solve these issues by proposing two novel frequency-locked loop structures based on repetitive controllers. The proposed solutions show many favorable features simultaneously, i ) they are resilient to all the commonly confronted grid interferences, such as harmonics, dc components, voltage sages, frequency variations, etc.; ii ) they are convenient to implement thanks to the simpler structure and significantly alleviated computation load; iii ) they have satisfying dynamic performance. Eventually, the effectiveness of the proposed frequency-locked loops is comprehensively verified by experiments under different working conditions.
ISSN:2169-3536
2169-3536
DOI:10.1109/ACCESS.2020.3018639