A novel robust active damping control strategy based on H∞ loop shaping for the grid-tied LCL inverter

作者：Wenju Sang, Wenyong Guo, Gang Xu, Tongzhen Wei, Changli Shi, Zongjie Liu, Xue Han, Zeyin He, Junzhi Li, J.x. Shen, Ruiqi Min, Siyuan Song, Xiaoxu Li, Yun Hong · 发表于：Frontiers in Energy Research · 年份：2024 · DOI：10.3389/fenrg.2024.1473060 · 被引用次数：2 · 研究领域：Microgrid Control and Optimization、Islanding Detection in Power Systems、Multilevel Inverters and Converters

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.