Journal
IEEE TRANSACTIONS ON POWER ELECTRONICS
Volume 31, Issue 12, Pages 8046-8051Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TPEL.2016.2564994
Keywords
Comb filter; frequency-locked loop; grid synchronization; harmonic rejection
Categories
Funding
- National Natural Science Foundation of China [51577088]
Ask authors/readers for more resources
To improve the performance of frequency-locked loops (FLLs) under distorted grid conditions, the technique of harmonic decoupling with multiple notch filters was usually employed to remove the harmonic components, which, although offering good filtering abilities, suffers from complexity, high computational burden, and deteriorated dynamics. To alleviate these problems, this letter proposes an enhanced adaptive notch-filter-based FLL, which incorporates a comb filter and improves the filtering abilities by introducing purely imaginary zeros to achieve notch peaks and harmonic cancellation. In comparison with the typical existing solutions of multiple notch-filter-based FLLs for distorted grid systems, the proposed FLL features simple structure and low computational load, and it can completely block the dc component, odd and even harmonics of the input grid voltage without sacrificing the FLL dynamics. Experimental results and comparisons are presented to validate the effectiveness of the proposed FLL.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available