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A Novel Stability Improvement Strategy for a Multi-Inverter System in a Weak Grid Utilizing Dual-Mode Control

Author

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  • Ming Li

    (School of Electrical Engineering and Automation, Hefei University of Technology, Hefei 230009, China)

  • Xing Zhang

    (School of Electrical Engineering and Automation, Hefei University of Technology, Hefei 230009, China)

  • Wei Zhao

    (Sungrow Power Supply Co., Ltd., Hefei 230088, China)

Abstract

Due to the increasing penetration of distributed generations (DGS) and non-negligible grid impedance, the instability problem of the multi-inverter system operating in current source mode (CSM) is becoming serious. In this paper, a closed-loop transfer function model of such a multi-inverter system is established, by which it is concluded that output current resonance will occur with the increase in the grid impedance. In order to address this problem, this paper presents a novel dual-mode control scheme of multiple inverters: one inverter operating in CSM will be alternated into voltage source mode (VSM) if the grid impedance is high. It is theoretically proved that the coupling between the inverters and the resonance in the output current can be suppressed effectively with the proposed scheme. Finally, the validity of the proposed theory is demonstrated by extensive simulations and experiments.

Suggested Citation

  • Ming Li & Xing Zhang & Wei Zhao, 2018. "A Novel Stability Improvement Strategy for a Multi-Inverter System in a Weak Grid Utilizing Dual-Mode Control," Energies, MDPI, vol. 11(8), pages 1-19, August.
    • Handle: RePEc:gam:jeners:v:11:y:2018:i:8:p:2144-:d:164167
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    References listed on IDEAS

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    1. Marwa Ben Said-Romdhane & Mohamed Wissem Naouar & Ilhem Slama Belkhodja & Eric Monmasson, 2017. "An Improved LCL Filter Design in Order to Ensure Stability without Damping and Despite Large Grid Impedance Variations," Energies, MDPI, vol. 10(3), pages 1-19, March.
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    Cited by:

    1. Panos C. Papageorgiou & Konstantinos F. Krommydas & Antonio T. Alexandridis, 2020. "Validation of Novel PLL-driven PI Control Schemes on Supporting VSIs in Weak AC-Connections," Energies, MDPI, vol. 13(6), pages 1-21, March.
    2. Quynh T.T Tran & Maria Luisa Di Silvestre & Eleonora Riva Sanseverino & Gaetano Zizzo & Thanh Nam Pham, 2018. "Driven Primary Regulation for Minimum Power Losses Operation in Islanded Microgrids," Energies, MDPI, vol. 11(11), pages 1-17, October.
    3. Tie Li & Yunlu Li & Junyou Yang & Weichun Ge & Bo Hu, 2019. "A Modified DSC-Based Grid Synchronization Method for a High Renewable Penetrated Power System Under Distorted Voltage Conditions," Energies, MDPI, vol. 12(21), pages 1-19, October.
    4. Paulo H. P. Silva & Francisco Kleber de A. Lima & Jean M. L. Fonseca & Carlos Gustavo C. Branco & Celso R. Schmidlin Júnior, 2018. "Synchronous Compensator Based on Doubly Fed Induction Generator to Improve the Power Quality under Unbalanced Grid Voltage Conditions," Energies, MDPI, vol. 11(10), pages 1-19, October.
    5. Mohamed Tolba & Hegazy Rezk & Ahmed A. Zaki Diab & Mujahed Al-Dhaifallah, 2018. "A Novel Robust Methodology Based Salp Swarm Algorithm for Allocation and Capacity of Renewable Distributed Generators on Distribution Grids," Energies, MDPI, vol. 11(10), pages 1-34, September.
    6. Claudio Burgos-Mellado & Alessandro Costabeber & Mark Sumner & Roberto Cárdenas-Dobson & Doris Sáez, 2019. "Small-Signal Modelling and Stability Assessment of Phase-Locked Loops in Weak Grids," Energies, MDPI, vol. 12(7), pages 1-30, March.

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