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Oscillation Suppression Method by Two Notch Filters for Parallel Inverters under Weak Grid Conditions

Author

Listed:
  • Ling Yang

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

  • Yandong Chen

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

  • Hongliang Wang

    (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 plenty of parallel inverters connected to a weak grid at the point of common coupling (PCC), the impedance coupling interactions between the inverters and the grid are enhanced, which may cause high-frequency harmonic oscillation and further aggravate the system instability. In this paper, a basic technique for inverter output impedance is proposed to suppress the oscillation, showing that the inverter output impedance should be designed relatively high at the harmonic oscillation frequency, while relatively low at other frequencies. On the basis of the proposed technique, two virtual impedances are added to be in parallel and in series with the original inverter output impedance, respectively. Thus, an oscillation suppression method by two notch filters is proposed to realize the virtual impedances and increase the whole system damping. The implementation forms of the virtual impedances are presented by the proposed PCC voltage feedforward and grid-side inductor current feedback with two notch filters. Finally, simulation and experimental results are provided to verify the validity of the proposed control method.

Suggested Citation

  • 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.
    • Handle: RePEc:gam:jeners:v:11:y:2018:i:12:p:3441-:d:189094
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    References listed on IDEAS

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    1. Ioannis Bouloumpasis & Panagis Vovos & Konstantinos Georgakas & Nicholas A. Vovos, 2015. "Current Harmonics Compensation in Microgrids Exploiting the Power Electronics Interfaces of Renewable Energy Sources," Energies, MDPI, vol. 8(4), pages 1-17, March.
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    Cited by:

    1. Ramy Ali & Terence O’Donnell, 2022. "Analysis and Mitigation of Harmonic Resonances in Multi–Parallel Grid–Connected Inverters: A Review," Energies, MDPI, vol. 15(15), pages 1-30, July.
    2. Teuvo Suntio & Tuomas Messo, 2019. "Power Electronics in Renewable Energy Systems," Energies, MDPI, vol. 12(10), pages 1-5, May.
    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. 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.

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