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An Improved Droop Control Method for Voltage-Source Inverter Parallel Systems Considering Line Impedance Differences

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  • Junjie Ma

    (College of Electrical and Electronics Engineering, Harbin University of Science and Technology, Harbin 150080, China
    College of Rongcheng, Harbin University of Science and Technology, Rongcheng 264300, China)

  • Xudong Wang

    (College of Electrical and Electronics Engineering, Harbin University of Science and Technology, Harbin 150080, China)

  • Jinfeng Liu

    (College of Electrical and Electronics Engineering, Harbin University of Science and Technology, Harbin 150080, China)

  • Hanying Gao

    (College of Electrical and Electronics Engineering, Harbin University of Science and Technology, Harbin 150080, China)

Abstract

In this paper, the effect of the line impedance difference between various inverters on power sharing with the traditional droop control method is fully analyzed. It reveals that the line impedance difference causes a significant reactive power error. An improved droop control method to eliminate the reactive power errors caused by the line impedance errors is proposed. In the proposed method, a voltage compensation determined by the actual reactive power error between the local inverter and the average one is added into the local voltage reference based on the CAN communication. Even when the communication is interrupted, the controller will operate with the last value of the average power, which still outperforms the traditional method. The effectiveness of the proposed control method is verified by simulation and experimental results, which show the proposed method possesses the better power sharing performance and dynamic response.

Suggested Citation

  • Junjie Ma & Xudong Wang & Jinfeng Liu & Hanying Gao, 2019. "An Improved Droop Control Method for Voltage-Source Inverter Parallel Systems Considering Line Impedance Differences," Energies, MDPI, vol. 12(6), pages 1-17, March.
    • Handle: RePEc:gam:jeners:v:12:y:2019:i:6:p:1158-:d:217020
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    References listed on IDEAS

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    1. Andishgar, Mohammad Hadi & Gholipour, Eskandar & Hooshmand, Rahmat-allah, 2017. "An overview of control approaches of inverter-based microgrids in islanding mode of operation," Renewable and Sustainable Energy Reviews, Elsevier, vol. 80(C), pages 1043-1060.
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    Cited by:

    1. Panagis N. Vovos & Ioannis D. Bouloumpasis & Konstantinos G. Georgakas, 2020. "Assessment Indexes for Converter P-Q Control Coupling," Energies, MDPI, vol. 13(5), pages 1-17, March.
    2. Monica Purushotham & Kowsalya Muniswamy, 2019. "Reinforced Droop for Active Current Sharing in Parallel NPC Inverter for Islanded AC Microgrid Application," Energies, MDPI, vol. 12(16), pages 1-27, August.
    3. Bilal Naji Alhasnawi & Basil H. Jasim & Walid Issa & Amjad Anvari-Moghaddam & Frede Blaabjerg, 2020. "A New Robust Control Strategy for Parallel Operated Inverters in Green Energy Applications," Energies, MDPI, vol. 13(13), pages 1-31, July.

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