Acta Scientiarum Naturalium Universitatis Sunyatseni ›› 2020, Vol. 59 ›› Issue (4): 64-73.doi: 10.13471/j.cnki.acta.snus.2019.07.10.2019B067

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Start-up optimization and phase-frequency decoupling strategy forenhanced phase-locked loop

HE Laipei, ZHENG Shousen, QI Xinmei, HUANG Yuhe   

  1. School of Physics, Sun Yat-sen University, Guangzhou 510275, China
  • Received:2019-07-10 Online:2020-07-25 Published:2020-07-25

Abstract: In this paper, a modified pseudolinear enhanced phase-locked loop (PL-EPLL) is proposed to improve the performance of PLL synchronization when the power grid is under non-ideal condition, such as disturbances and faults. The modification is based on a timely-decoupling strategy between the estimated phase-angle and the estimated frequency, for which in a designable frequency-locked range, the robustness of frequency synchronization is enhanced and the dynamic performance of PLL is improved. In addition, based on the feature that PL-EPLL has two different phase-locked points, an optimized setting of the initial value of the estimated phase-angle is introduced in this paper, which can statistically improve the start-up speed of the PL-EPLL algorithm. Finally, the feasibility of the proposed method has been verified by simulation and experimental results.

Key words: EPLL, PL-EPLL, phase-frequency decoupling, PLL start-up

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