Improved Frequency Locked Loop Based Synchronization Method for Three-Phase Grid-Connected Inverter under Unbalanced and Distorted Grid Conditions

To quickly and accurately estimate the parameters of the fundamental positive- and negative-sequence under the unbalanced and distorted grid voltage, a synchronization method is presented in this paper. The proposed method is based on both a harmonic decoupling network consisting of multiple dual se...

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Bibliographic Details
Published in:Energies (Basel) 2019-03, Vol.12 (6), p.1023
Main Authors: Ma, Wenjie, Ouyang, Sen, Xu, Weidong
Format: Article
Language:English
Subjects:
Adaptive algorithms
Adaptive filters
Bandwidths
Computer simulation
Design
Eigenvalues
Electric potential
Error signals
frequency locked loop (FLL)
Frequency locking
grid-connected inverter
Harmonics
Methods
Orbital stability
Resonant frequencies
Synchronism
Synchronization
synchronization method
unbalanced and distorted grid voltage
Voltage
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Summary:To quickly and accurately estimate the parameters of the fundamental positive- and negative-sequence under the unbalanced and distorted grid voltage, a synchronization method is presented in this paper. The proposed method is based on both a harmonic decoupling network consisting of multiple dual second-order generalized integrators (MDSOGIs) and an improved frequency locked loop (IFLL), so it is called the MDSOGI-IFLL. Due to the IFLL, the system has the feature that the dynamic performance of estimating the fundamental frequency is independent of the variation of both the fundamental positive- and negative-sequence voltage. In this paper, a first-order linear frequency adaption model is established for the design of the IFLL. Finally, the good performance of the proposed MDSOGI-IFLL is validated by the simulation and experiment.
ISSN:1996-1073
1996-1073
DOI:10.3390/en12061023