Modeling and Tuning of Circular Limit Cycle Oscillator FLL With Preloop Filter

Circular limit cycle oscillator-frequency-locked loop (CLO-FLL) is a recently proposed advanced nonlinear technique for the parameter estimation of grid voltage signal. It has fast convergence and can handle dc bias/offset. Nevertheless, the performance degrades in the presence of harmonics. In this...

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Bibliographic Details
Published inIEEE transactions on industrial electronics (1982) Vol. 66; no. 12; pp. 9632 - 9635
Main Authors Pay, Miao Lin, Ahmed, Hafiz
Format Journal Article
LanguageEnglish
Published New York IEEE 01.12.2019
The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subjects
Filtration
Frequency estimation
Frequency locked loops
Frequency locking
frequency-locked loop (FLL)
Harmonic analysis
Harmonics
Mathematical models
Oscillators
Parameter estimation
Performance assessment
Performance degradation
Phase locked loops
phase-locked loop (PLL)
Power harmonic filters
preloop filter
Transfer functions
Tuning
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Summary:Circular limit cycle oscillator-frequency-locked loop (CLO-FLL) is a recently proposed advanced nonlinear technique for the parameter estimation of grid voltage signal. It has fast convergence and can handle dc bias/offset. Nevertheless, the performance degrades in the presence of harmonics. In this letter, we propose the application of preloop filtering to enhance the robustness of the CLO-FLL in the presence of harmonics. Preloop filtering slightly increases the computational complexity. However, number of parameters to tune remain the same. The small-signal modeling, tuning, and performance comparisons of both techniques are performed in this letter.
Bibliography:ObjectType-Article-1
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content type line 14
ISSN:0278-0046
1557-9948
DOI:10.1109/TIE.2019.2892677