Problems of Startup and Phase Jumps in PLL Systems

Author

Ghartemani, Masoud Karimi ; Khajehoddin, Sayed Ali ; Jain, Praveen K. ; Bakhshai, Alireza

Author_Institution

Dept. of Electr. & Comput. Eng., Mississippi State Univ., Starkville, MS, USA

Volume

27

Issue

4

fYear

2012

fDate

4/1/2012 12:00:00 AM

Firstpage

1830

Lastpage

1838

Abstract

An adaptive phase-locked loop (PLL) structure is proposed which offers fast and smooth tracking of phase-angle jumps. Correlatively, it offers soft startup stage and avoids undesired frequency swings caused by phase jumps. The adaptive mechanism adjusts the gain of frequency estimation loop in order to mitigate large transients of frequency during sudden phase angle variations. This reduces the coupling of phase and frequency variables and allows tremendously faster and smoother estimation of both variables. The proposed adaptive mechanism can be applied to different PLL and adaptive notch-filter systems three of which including the enhanced PLL (EPLL), the synchronous reference frame PLL (SRF-PLL), and the second order generalized integrator frequency-locked loop (SOGI-FLL) are studied in this paper.

Keywords

frequency estimation; phase locked loops; PLL systems; SOGI-FLL; adaptive phase-locked loop structure; enhanced PLL; frequency estimation loop; phase jumps; second order generalized integrator frequency-locked loop; startup problems; synchronous reference frame PLL; Adaptive systems; Couplings; Frequency estimation; Phase locked loops; Synchronization; Transient analysis; EPLL; PLL startup; PLL transient response; SOGI-FLL; SRF-PLL; frequency estimation; phase estimation; phase jumps; phase-locked loop; synchronization;

fLanguage

English

Journal_Title

Power Electronics, IEEE Transactions on

Publisher

ieee

ISSN

0885-8993

Type

jour

DOI

10.1109/TPEL.2011.2169089

Filename

6025304