中山大学学报(自然科学版) ›› 2020, Vol. 59 ›› Issue (4): 64-73.doi: 10.13471/j.cnki.acta.snus.2019.07.10.2019B067

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增强型锁相环的启动优化和相频解耦改进算法 

何来沛, 郑寿森, 祁新梅, 黄玉和   

  1. 中山大学物理学院,广东 广州 510275
  • 收稿日期:2019-07-10 出版日期:2020-07-25 发布日期:2020-07-25
  • 通讯作者: 郑寿森(1963年生),男;研究方向:嵌入式系统设计、电力电子控制技术;E-mail:zhengshs@mail.sysu.edu.cn
  • 作者简介:何来沛(1995年生),男;研究方向:并网逆变控制;E-mail:help3@mail2.sysu.edu.cn

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

摘要: 锁相环结构中相位和频率紧密耦合,在电网处于干扰或短时故障工况下,同步频率的波动直接影响锁相的性能。基于假线性增强型锁相环(pseudolinear enhanced phase-locked loop, PL-EPLL),提出了一种适时解除相位和频率耦合的改进算法。该算法能够在设计锁频范围内,增强频率同步的稳定性和抗干扰能力,提高锁相的动态性能。另外,针对PL-EPLL具有两个相位锁定状态的特点,在算法实施上采用一种同步相位初始值优化设置,在初始相位差较大的情况下能够有效提高锁相算法的启动速度。最后,通过仿真和实验验证了改进算法的有效性。

关键词: 增强型锁相环, 假线性增强型锁相环, 相频解耦, 锁相启动

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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