A Hybrid Multiresonances Suppression Method for Nonsynchronous LCL-Type Grid-Connected Inverter Clusters under Weak Grid

Liu, Jiang; Sun, Xiangdong; Chen, Zechi; Chi, Yongchao; Song, Weizhang; Zhu, Qun; Wheeler, Patrick

Abstract

Multiresonance phenomena occur in inverter clusters under weak grid, with more complex resonance characteristics. Traditional suppression methods are difficult to determine control parameters when considering dynamic resonance under the variation of grid impedance. To this end, this article proposes a hybrid multiresonances suppression method based on the improved dual-division-summation (D-D-Σ) method and virtual admittance strategy. Multiresonances are divided into dynamic resonance and static resonance, in which dynamic resonance frequency shifts with the variation of grid impedance, and static resonance frequency remains fixed. D-D-Σ method with strong adaptive ability and paralleled virtual admittance strategy reshaped the inverter output impedance are used to suppress dynamic resonance and static resonance, respectively. The proposed hybrid multiresonance suppression method can adapt to parameter changes and simplify the center frequency design process of traditional paralleled virtual admittance. The experimental results of a parallel system with three inverters verify the feasibility of the proposed method in this article.

Citation

Liu, J., Sun, X., Chen, Z., Chi, Y., Song, W., Zhu, Q., & Wheeler, P. (2024). A Hybrid Multiresonances Suppression Method for Nonsynchronous LCL-Type Grid-Connected Inverter Clusters under Weak Grid. IEEE Transactions on Power Electronics, 39(5), 5386-5399. https://doi.org/10.1109/tpel.2024.3366191

• Journal Article Type: Article
• Acceptance Date: Feb 15, 2024
• Online Publication Date: Feb 15, 2024
• Publication Date: 2024-05
• Deposit Date: Apr 29, 2024
• Publicly Available Date: Apr 29, 2024
• Journal: IEEE Transactions on Power Electronics
• Electronic ISSN: 1941-0107
• Publisher: Institute of Electrical and Electronics Engineers
• Peer Reviewed: Peer Reviewed
• Volume: 39
• Issue: 5
• Pages: 5386-5399
• DOI: https://doi.org/10.1109/tpel.2024.3366191
• Keywords: Inverters , Modeling , Impedance , Admittance , Resonant frequency , Mathematical models , Resonant inverters , Unsynchronized , Suppression Method , Weak Grid , Grid-connected Inverter , Resonance Frequency , Control Parameters , Center Frequency , Chara
• Public URL: https://nottingham-repository.worktribe.com/output/31880898
• Publisher URL: https://ieeexplore.ieee.org/document/10438032