A Luenberger observer-based phase locked loop for single-phase systems under harmonic disturbances
A Luenberger observer-based phase locked loop for single-phase systems under harmonic disturbances
复制标题
谐波干扰下单相系统基于 Luenberger 观测器的锁相环
DOI:
10.1016/j.ijepes.2019.105528
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发表时间:
2020-03
影响因子:
5.2
通讯作者:
Zhang Juxiang
中科院分区:
文献类型:
--
作者:
Dai Zhiyong;Zhang Zhen;Yang Yongheng;Blaabjerg Frede;Yao Xin;Zhang Juxiang
Harmonics in single-phase systems challenge the performance of quadrature signal generator-based phase-locked loops (QSG-PLLs). This paper proposes a Luenberger observer-based PLL (LO-PLL) to address the issue. The proposed method enhances the harmonic suppression capability when estimating the fundamental grid voltage, thus leading to improved system harmonic rejection robustness. In detail, the improvement is enabled by the integrated grid voltage, which is mathematically established in this paper. Subsequently, the observer is adopted to generate the fundamental grid voltage and its quadrature signal. The resultant two signals for synchronization are highly robust against arbitrary-order harmonic disturbances, especially for interharmonics and noises. More importantly, as the poles of the observer can be designed flexibly, fast dynamics and strong harmonic robustness can be ensure for the entire PLL system. Experiments verify the performance of the proposed LO-PLL in terms of high harmonic immunity and fast dynamics.
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