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Admittance Reshaping Control Methods to Mitigate the Interactions between Inverters and Grid

Author

Listed:
  • Ling Yang

    (School of Automation, Guangdong University of Technology, Guangzhou 510006, China)

  • Yandong Chen

    (College of Electrical and Information Engineering, Hunan University, Changsha 410082, China)

  • An Luo

    (College of Electrical and Information Engineering, Hunan University, Changsha 410082, China)

  • Kunshan Huai

    (Guangzhou Power Supply Co., Ltd., Guangzhou 510620, China)

Abstract

With the increasing impedance coupling between inverters and grid caused by the phase-locked loop (PLL), traditional three-phase inverters suffer from the harmonic distortion or instability problems under weak grid conditions. Therefore, the admittance reshaping control methods are proposed to mitigate the interactions between inverters and grid. Firstly, a dynamics model of traditional inverter output admittance including main circuit and PLL is developed in the direct-quadrature (dq) frame. And the qq channel impedance of the inverter presents as a negative incremental resistance with the PLL effect. Secondly, two admittance reshaping control methods are proposed to improve the system damping. The first reshaping technique uses the feedforward point of common coupling (PCC) voltage to modify the inverter output admittance. The second reshaping technique adopts the active damping controller to reconstruct the PLL equivalent admittance. The proposed control methods not only increase the system phase margin, but also ensure the system dynamic response speed. And the total harmonic distortion of steady-state grid-connected current is reduced to less than 2%. Furthermore, a specific design method of control parameters is depicted. Finally, experimental results are provided to prove the validity of the proposed control methods.

Suggested Citation

  • Ling Yang & Yandong Chen & An Luo & Kunshan Huai, 2019. "Admittance Reshaping Control Methods to Mitigate the Interactions between Inverters and Grid," Energies, MDPI, vol. 12(13), pages 1-18, June.
  • Handle: RePEc:gam:jeners:v:12:y:2019:i:13:p:2457-:d:243083
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    References listed on IDEAS

    as
    1. Ling Yang & Yandong Chen & Hongliang Wang & An Luo & Kunshan Huai, 2018. "Oscillation Suppression Method by Two Notch Filters for Parallel Inverters under Weak Grid Conditions," Energies, MDPI, vol. 11(12), pages 1-20, December.
    2. Ningyun Zhang & Houjun Tang & Chen Yao, 2014. "A Systematic Method for Designing a PR Controller and Active Damping of the LCL Filter for Single-Phase Grid-Connected PV Inverters," Energies, MDPI, vol. 7(6), pages 1-21, June.
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    Cited by:

    1. 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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