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A Novel Autonomous Current-Sharing Control Strategy for Multiple Paralleled DC–DC Converters in Islanded DC Microgrid

Author

Listed:
  • Qinjin Zhang

    (Marine Engineering College, Dalian Maritime University, Dalian 116026, China)

  • Xuzhou Zhuang

    (Marine Engineering College, Dalian Maritime University, Dalian 116026, China)

  • Yancheng Liu

    (Marine Engineering College, Dalian Maritime University, Dalian 116026, China)

  • Chuan Wang

    (Marine Engineering College, Dalian Maritime University, Dalian 116026, China)

  • Haohao Guo

    (Marine Engineering College, Dalian Maritime University, Dalian 116026, China)

Abstract

Due to the existence of line impedances and low-bandwidth communication, the traditional peer-to-peer control method based on droop control has difficult meeting the requirements of current sharing and voltage stability in islanded DC microgrids at the same time. In this paper, a novel current-sharing control strategy based on injected small ac voltage with low frequency and low amplitude is proposed for multiple paralleled DC–DC converters. The small ac voltage is superimposed onto the output voltage of each converter. Then, the reactive circulating power is generated and used to regulate the output DC voltage of each converter. Under the droop characteristic between the injected frequency and output DC current, a feedback mechanism is generated to realize the accurate current sharing. On this basis, a reactive power-voltage limiter link and virtual negative impedance are added. Under the interaction of the two links, the bus voltage drop caused by line impedances can be almost completely eliminated. This method does not need any communication or to change the hardware structure. The controller design process is presented in detail along with a system stability analysis. Finally, the feasibility and effectiveness of the proposed control strategy are validated by the results obtained from simulations and experiments.

Suggested Citation

  • Qinjin Zhang & Xuzhou Zhuang & Yancheng Liu & Chuan Wang & Haohao Guo, 2019. "A Novel Autonomous Current-Sharing Control Strategy for Multiple Paralleled DC–DC Converters in Islanded DC Microgrid," Energies, MDPI, vol. 12(20), pages 1-22, October.
    • Handle: RePEc:gam:jeners:v:12:y:2019:i:20:p:3951-:d:277622
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    References listed on IDEAS

    as
    1. Zhiping Cheng & Zhongwen Li & Jing Liang & Jinfeng Gao & Jikai Si & Shuhui Li, 2019. "Distributed Economic Power Dispatch and Bus Voltage Control for Droop-Controlled DC Microgrids," Energies, MDPI, vol. 12(7), pages 1-22, April.
    2. Yu, Dongmin & Zhu, Haoming & Han, Wenqi & Holburn, Daniel, 2019. "Dynamic multi agent-based management and load frequency control of PV/Fuel cell/ wind turbine/ CHP in autonomous microgrid system," Energy, Elsevier, vol. 173(C), pages 554-568.
    3. Dong-Keun Jeong & Ho-Sung Kim & Ju-Won Baek & Hee-Je Kim & Jee-Hoon Jung, 2018. "Autonomous Control Strategy of DC Microgrid for Islanding Mode Using Power Line Communication," Energies, MDPI, vol. 11(4), pages 1-22, April.
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    Cited by:

    1. Lu Liu & Yun Zeng, 2023. "Intelligent ISSA-Based Non-Singular Terminal Sliding-Mode Control of DC–DC Boost Converter Feeding a Constant Power Load System," Energies, MDPI, vol. 16(13), pages 1-23, June.

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