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- Title
弱电网下基于一阶复矢量滤波器的锁相环补偿 控制策略及鲁棒性分析.
- Authors
杨明; 胡梦圆; 刘晋宏; 杨杰; 赵月圆
- Abstract
In grid-following control of LCL-type inverters, a phase-locked loop is generally adopted to acquire phase information of the voltage at the point of common coupling. Addressing the interaction between grid impedance and the conventional synchronous rotating coordinate system phase-locked loop under weak grid, which leads to poorer robustness and even unstable operation of the grid-connected inverter control system, this study firstly utilizes an impedance model to analyze the instability mechanism of grid-connected inverters under weak grid conditions. It reveals that the phase-locked loop and voltage feedforward will introduce an additional term in the output impedance, concluding that this additional term will impact the system’s robustness. Subsequently, a compensatory control strategy is proposed, involving the series connection of a new first-order complex vector filter in the phase-locked loop and grid voltage feedforward channels. Analyses indicate that this control strategy mitigates the influence of disturbances such as grid impedance and phase-locked loop bandwidth on the equivalent output impedance of the inverter, maintaining sufficient stability margin for the system under a wide range of grid impedance variations and enhancing the robustness of the grid-connected inverter. Finally, simulation analyses and experiments validate that the proposed control strategy effectively improves the system’ s adaptability to weak grids and possesses excellent dynamic and static performance.
- Subjects
PHASE-locked loops; BIVECTORS
- Publication
Electric Machines & Control / Dianji Yu Kongzhi Xuebao, 2023, Vol 27, Issue 10, p160
- ISSN
1007-449X
- Publication type
Article
- DOI
10.15938/j.emc.2023.10.016