Passivity-based stability analysis of parallel single-phase inverters with hybrid reference frame control considering PLL effect
Passivity-based stability analysis of parallel single-phase inverters with hybrid reference frame control considering PLL effect
复制标题
DOI：
10.1016/j.ijepes.2021.107473
复制
发表时间：
2022
影响因子：
5.2
通讯作者：
Yang Han;Yang Mengling;Ping Yang;Lin Xu;F. Blaabjerg
中科院分区：
文献类型：
--
作者：
Yang Han;Yang Mengling;Ping Yang;Lin Xu;F. Blaabjerg
基于无源性的稳定判据是分析多并联逆变器与电网交互稳定性问题的有效工具。然而，在利用无源性理论评价交互稳定性时，以往的研究忽略了电网同步和多次采样对逆变器输出导纳无源性的影响。为了填补这一空白，本文研究了并网控制中多重采样、电容电流反馈有源阻尼（CCF-AD）和各种锁相环（pll）等因素对逆变器输出导纳无源性的影响。此外，还评估了在感应电网和电容电网两种情况下互联系统的稳定性。由于有效控制延迟由多次采样系数决定，因此逆变器输出导纳在高频范围内的无源性主要受多次采样和CCF-AD的影响，而低频范围的无源性则与锁相环的带宽有关。在相同锁相环带宽的情况下，使用SOGI-PLL时导纳的非无源区域出现在较低的频带，因此相比之下非无源区域最小，鲁棒性更强。最后通过仿真研究和实验结果验证了理论分析的有效性。
The passivity-based stability criterion (PBSC) is an effective tool to analyze the interactive stability issues between the multi-parallel inverters and the grid. However, when using the passivity theory to evaluate the interactive stability, the influences of grid synchronization and multisampling on the passivity of inverter output admittance are overlooked in previous studies. To fill this gap, the impact factors in the grid-connected control, such as multisampling, capacitor current feedback active damping (CCF-AD) and various phase-locked loops (PLLs), on the passivity of inverter output admittance is investigated in this paper. Moreover, the stability of the interconnected system in the inductive and capacitive grid scenarios are also assessed. Since the effective control delay are determined by the multisampling coefficient, the passivity of inverter output admittance in the high-frequency range is mainly affected by multisampling and CCF-AD, whereas the passivity in the low-frequency range is related to the bandwidth of PLLs. In case of an identical PLL bandwidth, the non-passive region of admittance when using SOGI-PLL appears in a lower frequency band, and thus the non-passive region is the smallest in comparison, which provides stronger robustness. Finally, simulation studies and experimental results are presented to verify the effectiveness of the theoretical analysis.