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Passivity-Based Design for LCL-Filtered Grid-Connected Inverters with Inverter Current Control and Capacitor-Current Active Damping

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Abstract

Passivity-based design gains much popularity in grid-connected inverters (GCIs) since it enables system stability regardless of the uncertain grid impedance. This paper devotes to a systematic passivity-based design guidance for the LCL-filtered GCI with inverter current control and capacitor-current active damping. It is found that the passivity can be guaranteed with an optimal damping gain of the capacitor-current active damping, but it suffers from both the filter parameter drift and the lagging phase of the current regulator, especially at the one-sixth sampling frequency. To address this issue, a phase-lead compensation is introduced in series with the current regulator, which helps to enhance the full-band passivity and high robustness against the aforementioned challenge. Experiments are conducted to confirm the theoretical expectation.

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Funding

The funding was provided by National Natural Science Foundation of China (Grant No. 51507120).

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Authors and Affiliations

  1. Key Laboratory of Marine Intelligent Equipment and System (Ministry of Education), Shanghai Jiao Tong University, Shanghai, 200240, China

    Zeyang Fan & Hong Yi

  2. China Ship Development and Design Center, Wuhan, 430064, China

    Zeyang Fan, Jian Xu & Kun Xie

Authors
  1. Zeyang Fan
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  2. Hong Yi
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  3. Jian Xu
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  4. Kun Xie
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Correspondence to Hong Yi.

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Fan, Z., Yi, H., Xu, J. et al. Passivity-Based Design for LCL-Filtered Grid-Connected Inverters with Inverter Current Control and Capacitor-Current Active Damping. J. Electr. Eng. Technol. 19, 1541–1549 (2024). https://doi.org/10.1007/s42835-023-01659-w

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  • DOI: https://doi.org/10.1007/s42835-023-01659-w

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