A New Phase-Locked Loop System for Three-Phase Applications
A New Phase-Locked Loop System for Three-Phase Applications
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DOI：
10.1109/tpel.2012.2207967
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发表时间：
2013-03
影响因子：
6.7
通讯作者：
Masoud Karimi-Ghartemani;M. Mojiri;A. Safaee;J. Walseth;S. A. Khajehoddin;Praveen Jain;Alireza Bakhshai
中科院分区：
文献类型：
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作者：
Masoud Karimi-Ghartemani;M. Mojiri;A. Safaee;J. Walseth;S. A. Khajehoddin;Praveen Jain;Alireza Bakhshai
本文提出了一种新的三相锁相环系统，它主要估计三相输入信号的相角、频率和幅值，并提供输入的滤波形式。然后将其扩展到序列分量、它们的大小和相角的估计。与传统的三相锁相环相比，该方法不受信号不平衡和直流偏置的影响。它还提供了几个其他变量的估计，这些变量不包括在传统的三相锁相环中。与使用三个独立的单相增强型锁相环的方法相比，该方法具有更简单的结构。此外，估计的频率更准确、更平滑，因为它使用来自所有三个阶段的信息来估计频率的单个值。文中还提出了一种改进方案，使锁相环参数与输入信号幅值无关。同样的修改也适用于现有的方法，例如传统的三相锁相环。仿真和实验结果证实了该方法具有良好的性能。
This paper presents a new three-phase phase-locked loop (PLL) system that primarily estimates the phase angles, frequency, and magnitudes of the a three-phase input signal and also provides a filtered version of the input. It is then extended to the estimation of sequence components, their magnitudes, and phase angles. As compared with the conventional three-phase PLL, this method does not suffer from errors that are caused by signal unbalance and dc offset. It also provides estimate for several other variables which are not included in the conventional three-phase PLL. As compared with the method of using three independent single-phase enhanced PLLs, the proposed method offers a simpler structure. Moreover, the estimated frequency is more accurate and smoother because it uses the information from all three phases to estimate a single value for frequency. The paper also presents a modification that makes the PLL parameters independent from the input signal amplitude. The same modification is applicable to existing methods such as conventional three-phase PLL. Simulation and experimental results are presented to confirm desirable performance of the proposed method.