Modeling, Stability, and Design of the Single-Phase SOGI-Based Phase-Locked Loop Considering the Frequency Feedback Loop Effect
Modeling, Stability, and Design of the Single-Phase SOGI-Based Phase-Locked Loop Considering the Frequency Feedback Loop Effect
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考虑频率反馈环路效应的基于 SOGI 的单相锁相环的建模、稳定性和设计
DOI：
10.1109/tpel.2022.3201252
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发表时间：
2023-01
影响因子：
6.7
通讯作者：
Shaojun Xie
中科院分区：
文献类型：
--
作者：
Jinming Xu;Hao Qian;Qiang Qian;Shaojun Xie
对于单相并网逆变器，广泛采用二阶广义积分锁相环（SOGI-PLL），具有良好的谐波衰减和频率适应性。然而，现有研究在建模和设计过程中通常忽略频率反馈环，因此，频率反馈环引起的潜在不稳定性没有得到很好的解释。此外，SOGI-PLL设计不当会导致逆变器在理想和弱电网条件下不稳定。因此，本文充分考虑频率反馈环路的耦合，建立了SOGI-PLL的精确模型。此外，还研究了不同PLL参数对SOGI-PLL本身和逆变器行为的影响，在此基础上提出了PLL参数设计的图形化方法。事实证明，频率反馈环路会降低 SOGI-PLL 本身和逆变器系统的稳定性和性能，特别是在预期快速瞬态的情况下。该建模方法也被推广到低通滤波器-SOGI-PLL，并讨论了改进的参数设计。实验结果验证了所提出的PLL模型和上述分析结果的正确性。该模型有助于深入揭示不稳定机制，为非理想电网条件下的PLL设计提供参考。
For single-phase grid-connected inverters, the second-order generalized integrator-based phase-locked loop (SOGI-PLL) is widely used for good harmonics attenuation and frequency adaptability. However, existing studies usually neglect the frequency feedback loop in the modeling and design process, and thus, the potential instability caused by the frequency feedback loop is not well explained. Besides, the improper design of SOGI-PLL can lead to the inverter instability both under ideal and weak grid conditions. Therefore, by fully considering the coupling of the frequency feedback loop, this article establishes an accurate model for SOGI-PLL. Furthermore, effects of different PLL parameters on behaviors of both the SOGI-PLL itself and the inverter are studied, based on which a graphical method for PLL parameters design is proposed. As proved, the frequency feedback loop can deteriorate the stability and performance of both SOGI-PLL itself and inverter system, especially if rapid transient is expected. The modeling method is also extended to the low-pass filter-SOGI-PLL and the improved parameters design is discussed. Experimental results verify the correctness of the proposed PLL model and the abovementioned analysis results. The proposed model is helpful to deeply reveal the instability mechanism and provides a reference for the PLL design under nonideal grid conditions.
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影响因子：
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