Modeling and Stability Assessment of Single-Phase Grid Synchronization Techniques: Linear Time-Periodic Versus Linear Time-Invariant Frameworks
Modeling and Stability Assessment of Single-Phase Grid Synchronization Techniques: Linear Time-Periodic Versus Linear Time-Invariant Frameworks
复制标题
单相电网同步技术的建模和稳定性评估：线性时周期框架与线性时不变框架
DOI：
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发表时间：
2019
影响因子：
6.7
通讯作者：
J. Vasquez
中科院分区：
文献类型：
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作者：
S. Golestan;J. Guerrero;J. Vasquez
通常基于锁相环（PLL）或锁频环（FLL）的电网同步单元高度影响功率转换器的性能和稳定性，特别是在弱电网条件下。这意味着对电网同步技术（GST）进行仔细的稳定性评估是至关重要的。这项任务通常是基于获得一个线性时不变（LTI）模型的GST和应用标准的稳定性测试。另一种选择是建模和动力学/稳定性评估的GST的线性时间周期（LTP）的框架，这已经得到了一点关注。在这封信中，推导单相GST的LTP模型的程序首次演示。对LTP模型在预测GST动力学行为和稳定性方面的准确性进行了评估，并与LTI模型进行了比较。两个众所周知的单相GST，即，基于二阶广义积分器的FLL（SOGI-FLL）和增强型PLL（EPLL）被认为是案例研究。
The grid synchronization unit, which is often based on a phase-locked loop (PLL) or a frequency-locked loop (FLL), highly affects the power converter performance and stability, particularly under weak grid conditions. It implies that a careful stability assessment of grid synchronization techniques (GSTs) is of vital importance. This task is most often based on obtaining a linear time-invariant (LTI) model for the GST and applying standard stability tests to it. Another option is modeling and dynamics/stability assessment of GSTs in the linear time-periodic (LTP) framework, which has received a little attention. In this letter, the procedure of deriving the LTP model for single-phase GSTs is first demonstrated. The accuracy of the LTP model in predicting the GST dynamic behavior and stability is then evaluated and compared with that of the LTI one. Two well-known single-phase GSTs, i.e., the second-order generalized integrator-based FLL (SOGI-FLL) and enhanced PLL (EPLL), are considered as the case studies.