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- Title
LLCL 滤波并网逆变器的改进型加权平均电流 控制策略.
- Authors
杨明; 杨杰; 赵铁英; 郑晨; 韦延方
- Abstract
The weighted average current (WAC) control strategy has attracted much attention because of its lower-order effect on grid-connected inverters. However, the system reverse resonant peak caused by digital control delay causes the traditional WAC control to fail, and the inverter’s adaptation range to the grid impedance under the weak power grid is reduced. In view of this, this article does not proceed from the perspective of WAC control reduction, but re-examines it from the perspective of grid-side current stability of the equivalent impedance model of the inverter and grid interconnection system. An improved WAC control strategy of feedforward complex vector filter using LLCL grid-connected inverter is proposed to improve the phase of the equivalent output impedance of the grid-connected inverter in the low-frequency domain. It can make the phase in the full frequency domain of Nyquist higher than-90°, thereby enhancing the stability of the system. Finally, theoretical and simulation analysis verify the effectiveness of the proposed control strategy.
- Subjects
BIVECTORS; GRIDS (Cartography); ELECTRIC power distribution grids; NYQUIST frequency; ELECTRIC inverters
- Publication
Electric Machines & Control / Dianji Yu Kongzhi Xuebao, 2023, Vol 27, Issue 8, p109
- ISSN
1007-449X
- Publication type
Article
- DOI
10.15938/j.emc.2023.08.012