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An Improved Droop Control Strategy Based on Changeable Reference in Low-Voltage Microgrids

Author

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  • Chunxia Dou

    (Institute of Electrical Engineering, Yanshan University, Qinhuangdao 066004, China
    Institute of Advanced Technology, Nanjing University of Posts and Telecommunications, Nanjing 210023, China)

  • Zhanqiang Zhang

    (Institute of Electrical Engineering, Yanshan University, Qinhuangdao 066004, China)

  • Dong Yue

    (Institute of Advanced Technology, Nanjing University of Posts and Telecommunications, Nanjing 210023, China)

  • Hanxiao Gao

    (Institute of Marxism, Yanshan University, Qinhuangdao 066004, China)

Abstract

This paper proposes an improved droop control strategy based on changeable reference in low-voltage microgrids. To restore running frequency of distributed generation to a rated value without affecting its reactive power output, changeable frequency reference, mainly compensating for frequency deviation, are proposed corresponding to various load demands. In terms of active power sharing inaccuracy associated with mismatched line impedance, changeable voltage amplitude reference is proposed to obtain a droop line suitable for the actual voltage of distributed generations. By further improvement of the active droop coefficient, power sharing is accurate with a difference in actual voltages of distributed generations. Virtual negative inductance is used to neutralize the redundant line inductance for strictly improving sharing accuracy. A robust control method based on Lyapunov function is used to handle the robustness problem in case of load variation. The control scheme is entirely decentralized, so communication links among distributed generations are redundant. Finally, simulation studies demonstrate the effectiveness of a control strategy.

Suggested Citation

  • Chunxia Dou & Zhanqiang Zhang & Dong Yue & Hanxiao Gao, 2017. "An Improved Droop Control Strategy Based on Changeable Reference in Low-Voltage Microgrids," Energies, MDPI, vol. 10(8), pages 1-18, July.
    • Handle: RePEc:gam:jeners:v:10:y:2017:i:8:p:1080-:d:105909
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    References listed on IDEAS

    as
    1. Kyriakarakos, George & Dounis, Anastasios I. & Rozakis, Stelios & Arvanitis, Konstantinos G. & Papadakis, George, 2011. "Polygeneration microgrids: A viable solution in remote areas for supplying power, potable water and hydrogen as transportation fuel," Applied Energy, Elsevier, vol. 88(12), pages 4517-4526.
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    Cited by:

    1. Bum-Jun Kim & Ho-Jung Kum & Jung-Min Park & Chung-Yuen Won, 2018. "Analysis, Design and Implementation of Droop-Controlled Parallel-Inverters Using Dynamic Phasor Model and SOGI-FLL in Microgrid Applications," Energies, MDPI, vol. 11(7), pages 1-19, June.
    2. Qiuxia Yang & Dongmei Yuan & Xiaoqiang Guo & Bo Zhang & Cheng Zhi, 2018. "A Novel Hierarchical Control Strategy for Low-Voltage Islanded Microgrids Based on the Concept of Cyber Physical System," Energies, MDPI, vol. 11(7), pages 1-24, July.
    3. Yalong Hu & Wei Wei, 2018. "Improved Droop Control with Washout Filter," Energies, MDPI, vol. 11(9), pages 1-18, September.

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