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An Active Power Sharing Method among Distributed Energy Sources in an Islanded Series Micro-Grid

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  • Wei-Man Yang

    (College of Electrical Engineering and Information Engineering, Lanzhou University of Technology, Lanzhou 730050, Gansu, China)

  • Xing-Gui Wang

    (College of Electrical Engineering and Information Engineering, Lanzhou University of Technology, Lanzhou 730050, Gansu, China)

  • Xiao-Ying Li

    (College of Electrical Engineering and Information Engineering, Lanzhou University of Technology, Lanzhou 730050, Gansu, China)

  • Zheng-Ying Liu

    (College of Electrical Engineering and Information Engineering, Lanzhou University of Technology, Lanzhou 730050, Gansu, China)

Abstract

Active power-sharing among distributed energy sources (DESs) is not only an important way to realize optimal operation of micro-grids, but also the key to maintaining stability for islanded operation. Due to the unique configuration of series micro-grids (SMGs), the power-sharing method adopted in an ordinary AC, DC, and hybrid AC/DC system cannot be directly applied into SMGs. Power-sharing in one SMG with multiple DESs involves two aspects. On the one hand, capacitor voltage stability based on an energy storage system (ESS) in the DC link must be complemented. Actually, this is a problem of power allocation between the generating unit and the ESS in the DES; an extensively researched, similar problem has been grid-off distributed power generation, for which there are good solutions. On the other hand, power-sharing among DESs should be considered to optimize the operation of a series micro-grid. In this paper, a novel method combining master control with auxiliary control is proposed. Master action of a quasi-proportional resonant controller is responsible for stability of the islanded SMG; auxiliary action based on state of charge ( SOC ) realizes coordinated allocation of load power among the source. At the same time, it is important to ensure that the auxiliary control does not influence the master action.

Suggested Citation

  • Wei-Man Yang & Xing-Gui Wang & Xiao-Ying Li & Zheng-Ying Liu, 2014. "An Active Power Sharing Method among Distributed Energy Sources in an Islanded Series Micro-Grid," Energies, MDPI, vol. 7(12), pages 1-15, November.
    • Handle: RePEc:gam:jeners:v:7:y:2014:i:12:p:7878-7892:d:42786
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    References listed on IDEAS

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    2. Llaria, Alvaro & Curea, Octavian & Jiménez, Jaime & Camblong, Haritza, 2011. "Survey on microgrids: Unplanned islanding and related inverter control techniques," Renewable Energy, Elsevier, vol. 36(8), pages 2052-2061.
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    Cited by:

    1. Fengbing Li & Kaigui Xie & Jiangping Yang, 2015. "Optimization and Analysis of a Hybrid Energy Storage System in a Small-Scale Standalone Microgrid for Remote Area Power Supply (RAPS)," Energies, MDPI, vol. 8(6), pages 1-25, May.

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