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Harmonic Stability Analysis for Multi-Parallel Inverter-Based Grid-Connected Renewable Power System Using Global Admittance

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  • Wu Cao

    (School of Electrical Engineering, Southeast University, Nanjing 210096, China
    Jiangsu Provincial Key Laboratory of Smart Grid Technology and Equipment, Nanjing 210096, China)

  • Kangli Liu

    (School of Electrical Engineering, Southeast University, Nanjing 210096, China)

  • Shunyu Wang

    (School of Electrical Engineering, Southeast University, Nanjing 210096, China)

  • Haotian Kang

    (School of Electrical Engineering, Southeast University, Nanjing 210096, China)

  • Dongchen Fan

    (State Grid Jiangsu Electric Power Co., Ltd. Research Institute, Nanjing 210096, China)

  • Jianfeng Zhao

    (School of Electrical Engineering, Southeast University, Nanjing 210096, China)

Abstract

Multi-parallel grid-connected voltage source inverters (VSIs) are widely applied in the fields of renewable energy, energy storage, harmonic suppression, etc. However, these inverters may cause harmonic stability problems due to the interactions among the grid-connected inverters through the grid impedance, which can seriously threaten system stability. The impedance-based stability criterion provides an effective tool for analyzing harmonic instability issues and can be divided into two types, namely, a ratio type and a sum type. Based on the existing studies of the sum-type criterion, this paper further proposes a new sum-type form based on the global admittance from the PCC to assess system stability through frequency-domain analysis. This global admittance-based stability criterion can be used not only to analyze system stability, but also to reveal the influence of each VSI unit on system stability with a lower computational burden and provide guidance for resonance suppression, especially in the case of a large number of grid-connected inverters and asymmetric inverter parameters. Finally, a MATLAB/Simulink model and 400 kVA/400 V experimental platform consisting of six grid-connected VSIs were established, and the corresponding results are presented to verify the effectiveness of the proposed method.

Suggested Citation

  • Wu Cao & Kangli Liu & Shunyu Wang & Haotian Kang & Dongchen Fan & Jianfeng Zhao, 2019. "Harmonic Stability Analysis for Multi-Parallel Inverter-Based Grid-Connected Renewable Power System Using Global Admittance," Energies, MDPI, vol. 12(14), pages 1-16, July.
    • Handle: RePEc:gam:jeners:v:12:y:2019:i:14:p:2687-:d:247945
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    References listed on IDEAS

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    1. Youngho Cho & Kyeon Hur & Yong Cheol Kang & Eduard Muljadi, 2017. "Impedance-Based Stability Analysis in Grid Interconnection Impact Study Owing to the Increased Adoption of Converter-Interfaced Generators," Energies, MDPI, vol. 10(9), pages 1-17, September.
    2. Teuvo Suntio & Tuomas Messo & Matias Berg & Henrik Alenius & Tommi Reinikka & Roni Luhtala & Kai Zenger, 2019. "Impedance-Based Interactions in Grid-Tied Three-Phase Inverters in Renewable Energy Applications," Energies, MDPI, vol. 12(3), pages 1-31, January.
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    Cited by:

    1. Wu Cao & Kangli Liu & Haotian Kang & Shunyu Wang & Dongchen Fan & Jianfeng Zhao, 2019. "Resonance Detection Strategy for Multi-Parallel Inverter-Based Grid-Connected Renewable Power System Using Cascaded SOGI-FLL," Sustainability, MDPI, vol. 11(18), pages 1-15, September.
    2. Nabil Mohammed & Mihai Ciobotaru & Graham Town, 2019. "Online Parametric Estimation of Grid Impedance Under Unbalanced Grid Conditions," Energies, MDPI, vol. 12(24), pages 1-21, December.

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