AUTHOR=Sang Wenju , Guo Wenyong , Xu Gang , Wei Tongzhen , Shi Changli , Liu Zongjie , Xue Han , He Zhenning , Li Junzhi , Shen Jiazhen , Min Ruiqi , Song Shaobo , Li Xiaoxu , Hong Yun TITLE=A novel robust active damping control strategy based on H∞ loop shaping for the grid-tied LCL inverter JOURNAL=Frontiers in Energy Research VOLUME=12 YEAR=2024 URL=https://www.frontiersin.org/journals/energy-research/articles/10.3389/fenrg.2024.1473060 DOI=10.3389/fenrg.2024.1473060 ISSN=2296-598X ABSTRACT=

LCL-type grid-connected inverters have been widely used in renewable power generation due to their size and cost advantages. However, the LCL filter has a problem of insufficient damping, which may lead to power system instability. Two common methods are used to address this problem: passive damping (PD) and active damping (AD). PD methods suppress resonance by adding resistors to the LCL filter, but this approach increases system losses. AD methods enhance damping through control to suppress resonance. Existing AD methods are often significantly affected by grid-side inductance perturbation, resulting in insufficient robustness. To address this issue, this article proposes a novel robust active damping (RAD) control strategy based on H∞ loop shaping. Simulation analysis and experimental research show that the RAD control method exhibits superior robustness compared with the traditional capacitor current active damping control.