Accurate Modeling of PLL With Frequency-Adaptive Prefilter: On the Positive Feedback Effect
Accurate Modeling of PLL With Frequency-Adaptive Prefilter: On the Positive Feedback Effect
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DOI：
10.1109/tpel.2021.3124930
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发表时间：
2022
影响因子：
6.7
通讯作者：
Jiaxing Lei;Xiangjun Quan;Shuang Feng;Jianfeng Zhao;Wu Chen
中科院分区：
文献类型：
--
作者：
Jiaxing Lei;Xiangjun Quan;Shuang Feng;Jianfeng Zhao;Wu Chen
锁相环（PLL）具有频率自适应前置滤波器，可以抑制输入干扰，因此得到了广泛的研究。然而，他们的准确模型是在文献中缺席。特别是，频率自适应（FA）的影响被低估了。本文以基于双二阶广义积分器（DSOGI）的锁相环为例，提出了一种精确的分析建模方法，重点研究了频率自适应对锁相环性能的影响。该模型能精确描述DSOGI-PLL的瞬态特性，特别是幅度、相位和频率之间的耦合。同时，分析表明，FA产生了一个正反馈路径，这是导致不稳定现象的根本原因，也是限制PLL性能的关键因素。实验结果验证了该模型的准确性。
Phase locked loops (PLLs) with frequency-adaptive prefilters could suppress input disturbances and thus are widely studied. However, their accurate models are absent in the literature. In particular, the impact of frequency adaption (FA) is underestimated. This letter proposes the accurate and analytical modeling method with focus on the impact of frequency adaption, by taking the PLL based on dual second-order generalized integrator (DSOGI) as an example. The proposed model can precisely describe the transient behaviors of DSOGI-PLL, especially the couplings among amplitude, phase angle, and frequency. Moreover, it reveals that the FA creates a positive feedback path, which is the essential reason for the instability phenomenon and the key factor limiting the PLL performance. Experimental results have verified the accuracy of the proposed model.