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Novel Active Damping Design Based on a Biquad Filter for an LLCL Grid-Tied Inverter

Author

Listed:
  • Bin Wang

    (School of Electronic and Information, Zhongyuan University of Technology, Zhengzhou 450007, China)

  • Qiangsong Zhao

    (School of Electronic and Information, Zhongyuan University of Technology, Zhengzhou 450007, China)

  • Gong Zhang

    (School of Electronic and Information, Zhongyuan University of Technology, Zhengzhou 450007, China)

  • Hongwei Zhang

    (School of Electronic and Information, Zhongyuan University of Technology, Zhengzhou 450007, China)

  • Kaiyue Liu

    (School of Electronic and Information, Zhongyuan University of Technology, Zhengzhou 450007, China)

  • Xuebin Yue

    (Department of Electronic and Computer Engineering, Ritsumeikan University, Kusatsu 525-8577, Shiga, Japan)

Abstract

LLCL filters for grid-tied inverters have been adopted to get better performance for the harmonics near the switching frequency than commonly used LCL filters. However, the resonant peak caused by a pair of unstable resonance poles of the LLCL filters is introduced and makes the system become unstable. In this paper, a biquad filter composed of a notch filter and a resonator is introduced to restrain the resonant peak. In this method, the resonance point and the notch point of the biquad filter are placed at the appointed frequency, and the resonant peak is transferred to the stable area by phase transformation, so that the system does not cross −180° at the resonant peak. This method makes the system have higher control bandwidth and stronger robustness even in a weak power grid. Meanwhile, a proportional-integral multiresonant repetitive controller is used to restrain low-frequency current harmonics and improve the steady-state and dynamic performance of the control system. Furthermore, based on the active damping of the biquad filter, the stability criterion of the control system under a weak power grid is given. Finally, the accuracy of the analysis and the effectiveness of the method is verified by simulations.

Suggested Citation

  • Bin Wang & Qiangsong Zhao & Gong Zhang & Hongwei Zhang & Kaiyue Liu & Xuebin Yue, 2023. "Novel Active Damping Design Based on a Biquad Filter for an LLCL Grid-Tied Inverter," Energies, MDPI, vol. 16(3), pages 1-15, January.
    • Handle: RePEc:gam:jeners:v:16:y:2023:i:3:p:1093-:d:1040674
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    References listed on IDEAS

    as
    1. Jiaxuan Han & Qiteng Hong & Zhiwang Feng & Mazheruddin H. Syed & Graeme M. Burt & Campbell D. Booth, 2022. "Design and Implementation of a Real-Time Hardware-in-the-Loop Platform for Prototyping and Testing Digital Twins of Distributed Energy Resources," Energies, MDPI, vol. 15(18), pages 1-19, September.
    2. Diuary Gonçalves & João Victor Matos Farias & Heverton Augusto Pereira & Alex-Sander Amável Luiz & Marcelo Martins Stopa & Allan Fagner Cupertino, 2022. "Design of Damping Strategies for LC Filter Applied in Medium Voltage Variable Speed Drive," Energies, MDPI, vol. 15(15), pages 1-18, August.
    3. Pedro C. Bolsi & Edemar O. Prado & Hamiltom C. Sartori & João Manuel Lenz & José Renes Pinheiro, 2022. "LCL Filter Parameter and Hardware Design Methodology for Minimum Volume Considering Capacitor Lifetimes," Energies, MDPI, vol. 15(12), pages 1-20, June.
    4. Pavel Ilyushin & Vladislav Volnyi & Konstantin Suslov & Sergey Filippov, 2022. "Review of Methods for Addressing Challenging Issues in the Operation of Protection Devices in Microgrids with Voltages of up to 1 kV That Integrates Distributed Energy Resources," Energies, MDPI, vol. 15(23), pages 1-22, December.
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