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Impedance Characteristics and Harmonic Analysis of LCL-Type Grid-Connected Converter Cluster

Author

Listed:
  • Xiaojie Zhou

    (School of Electrical and Electronic Engineering, Anhui Science and Technology University, Bengbu 233100, China)

  • Dezhi Xu

    (School of Electrical Information Engineering, Jiangsu University, Zhenjiang 212013, China)

  • Yourui Huang

    (School of Electrical and Electronic Engineering, Anhui Science and Technology University, Bengbu 233100, China)

Abstract

This study addresses the output impedance model of the LCL-type grid-connected converter considering the dead-time effects and the digital control delay. The model shows that the digital control delay will affect the accuracy of the output impedance of the grid-connected converter, and the dead-time effects are only equivalent to superimposing a disturbance voltage on the original output impedance model. The derived output impedance model is verified by comparing it with the switching model in the PSIM simulation environment. The harmonic interaction between converter cluster and utility grid is modeled and analyzed based on the output impedance model. A combined harmonic suppression strategy is incorporated into every converter control scheme to suppress the harmonic interaction. Simulation results are presented to demonstrate the correctness of harmonic interaction analysis and the effectiveness of the proposed suppression strategy.

Suggested Citation

  • Xiaojie Zhou & Dezhi Xu & Yourui Huang, 2022. "Impedance Characteristics and Harmonic Analysis of LCL-Type Grid-Connected Converter Cluster," Energies, MDPI, vol. 15(10), pages 1-18, May.
    • Handle: RePEc:gam:jeners:v:15:y:2022:i:10:p:3708-:d:818703
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    References listed on IDEAS

    as
    1. Shaojian Song & Peichen Guan & Bin Liu & Yimin Lu & Huihwang Goh, 2021. "Impedance Modeling and Stability Analysis of DFIG-Based Wind Energy Conversion System Considering Frequency Coupling," Energies, MDPI, vol. 14(11), pages 1-22, June.
    2. Muhammad Saleem & Byoung-Sun Ko & Si-Hwan Kim & Sang-il Kim & Bhawani Shankar Chowdhry & Rae-Young Kim, 2019. "Active Disturbance Rejection Control Scheme for Reducing Mutual Current and Harmonics in Multi-Parallel Grid-Connected Inverters," Energies, MDPI, vol. 12(22), pages 1-21, November.
    3. Guoli Feng & Zhihao Ye & Yihui Xia & Liming Huang & Zerun Wang, 2022. "Impedance Modeling and Stability Analysis of Three-Phase Four-Wire Inverter with Grid-Connected Operation," Energies, MDPI, vol. 15(8), pages 1-26, April.
    Full references (including those not matched with items on IDEAS)

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