LCL-resonance damping strategies for grid-connected inverters with LCL filters: a comprehensive review

Journal of Modern Power Systems and Clean Energy

Shaojun XIE¹  Jinming XU¹ 

[1] College of Automation Engineering, Nanjing University of Aeronautics and Astronautics;

关键词: LCL filter;    Grid-connected inverter;    Resonance damping;    State feedback;    Investigation;   

DOI  :  10.1007/s40565-017-0319-7

来源: DOAJ

【 摘 要 】

Abstract Grid-connected LCL-filtered inverters are commonly used for distributed power generators. The LCL resonance should be treated properly. Recently, many strategies have been used to damp the resonance, but the relationships between different damping strategies have not been thoroughly investigated. Thus, this study analyses the essential mechanisms of LCL-resonance damping and reviews state-of-the-art resonance damping strategies. Existing resonance damping strategies are classified into those with single-state and multi-state feedback. Single-state feedback strategies damp the LCL resonance using feedback of a voltage or current state at the resonance frequency. Multi-state feedback strategies are summarized as zero-placement and pole-placement strategies, where the zero-placement strategy configures the zeros of a novel state combined by multi-state feedback, while the pole-placement strategy aims to assign the closed-loop poles freely. Based on these mechanisms, an investigation of single-state and multi-state feedback is presented, including detailed comparisons of the existing strategies. Finally, some future research directions that can improve LCL-filtered inverter performance and minimize their implementation costs are summarized.

【 授权许可】

Unknown