LAPSE:2023.35905
Published Article
LAPSE:2023.35905
Grid-Connected Phase-Locked Loop Technology Based on a Cascade Second-Order IIR Filter
Shanwen Ke, Yuren Li
May 26, 2023
The moving average filter-based phase-locked loop (MAF-PLL) can obtain grid synchronization signals accurately under adverse grid conditions with a large amount of harmonics due to the high filtering capability of the MAF. However, MAF-PLL cannot achieve a fast dynamic response in the case of frequency drift, phase angle steps, and unbalanced voltage sag. MAF is essentially an FIR filter, and its filtering performance is hard to be adjusted. To address this issue, this paper proposes an alternative to MAF consisting of a set of cascading second-order IIR filters (CIIRF). Based on MAF, CIIRF introduces multiple zeros and poles from the zero−pole replacement perspective, and by changing the position of the poles, the filter performance can be adjusted. To improve the anti-interference ability of PLL based on CIIRF (CIIRF-PLL) in the presence of grid frequency drift, a frequency-adaptive scheme is also proposed. Simulation and experimental results show that CIIRF-PLL can accurately track the grid voltage phase in the case of frequency steps, phase angle jumps, harmonics injection, and unbalanced voltage sag and has good steady-state and dynamic performance.
Keywords
grid-connected inverter, harmonics, IIR filter, phase-locked loop
Suggested Citation
Ke S, Li Y. Grid-Connected Phase-Locked Loop Technology Based on a Cascade Second-Order IIR Filter. (2023). LAPSE:2023.35905
Author Affiliations
Ke S: Department of Electrical Engineering, Northwestern Polytechnical University, Xi’an 710072, China
Li Y: Department of Electrical Engineering, Northwestern Polytechnical University, Xi’an 710072, China
Journal Name
Energies
Volume
16
Issue
9
First Page
3967
Year
2023
Publication Date
2023-05-08
Published Version
ISSN
1996-1073
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Original Submission
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PII: en16093967, Publication Type: Journal Article
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LAPSE:2023.35905
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doi:10.3390/en16093967
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May 26, 2023
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[v1] (Original Submission)
May 26, 2023
 
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May 26, 2023
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Calvin Tsay
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