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Improved Control Strategy for Microgrid Ultracapacitor Energy Storage Systems

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Listed:
  • Xiaobo Dou

    (Department of Electrical Engineering, Southeast University, No. 2 Sipailou, Nanjing 210096, China)

  • Xiangjun Quan

    (Department of Electrical Engineering, Southeast University, No. 2 Sipailou, Nanjing 210096, China
    These authors contributed equally to this work.)

  • Zaijun Wu

    (Department of Electrical Engineering, Southeast University, No. 2 Sipailou, Nanjing 210096, China
    These authors contributed equally to this work.)

  • Minqiang Hu

    (Department of Electrical Engineering, Southeast University, No. 2 Sipailou, Nanjing 210096, China
    These authors contributed equally to this work.)

  • Jianlong Sun

    (Department of Electrical Engineering, Southeast University, No. 2 Sipailou, Nanjing 210096, China)

  • Kang Yang

    (Department of Electrical Engineering, Southeast University, No. 2 Sipailou, Nanjing 210096, China)

  • Minhui Xu

    (Department of Electrical Engineering, Southeast University, No. 2 Sipailou, Nanjing 210096, China)

Abstract

Ultracapacitors (UCs), with their features of high power density and high current charge-discharge, have become the best choice for dynamic power compensation to improve the stability of microgrids and are increasingly being applied in microgrids. This paper presents the control of an energy storage system (ESS) based on ultracapacitors in the context of grid-connected microgrids. The ESS is composed of DC/AC and DC/DC converters tied by a dc link. An improved dynamic model for the ESS is proposed. Based on the proposed model a Proportional-Integral-Resonant (PIR) DC link voltage controller is proposed to maintain the DC link voltage through the charging-discharging control of ultracapacitors, capable of working properly under all operating conditions. An extra double frequency component is injected into the UC current by a R controller to dynamically compensate for DC instantaneous power and double frequency AC instantaneous power due to unbalanced grid conditions and disturbances. This feature maintains the DC link voltage constant under unbalanced conditions and increases the degrees of freedom of the DC/AC converter and thus facilitates the application of UCs in microgrids. Simulation and experimental results verify the effectiveness of the proposed control strategy.

Suggested Citation

  • Xiaobo Dou & Xiangjun Quan & Zaijun Wu & Minqiang Hu & Jianlong Sun & Kang Yang & Minhui Xu, 2014. "Improved Control Strategy for Microgrid Ultracapacitor Energy Storage Systems," Energies, MDPI, vol. 7(12), pages 1-21, December.
    • Handle: RePEc:gam:jeners:v:7:y:2014:i:12:p:8095-8115:d:43028
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    References listed on IDEAS

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    2. Hadjipaschalis, Ioannis & Poullikkas, Andreas & Efthimiou, Venizelos, 2009. "Overview of current and future energy storage technologies for electric power applications," Renewable and Sustainable Energy Reviews, Elsevier, vol. 13(6-7), pages 1513-1522, August.
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    Cited by:

    1. Bingke Yan & Bo Wang & Lin Zhu & Hesen Liu & Yilu Liu & Xingpei Ji & Dichen Liu, 2015. "A Novel, Stable, and Economic Power Sharing Scheme for an Autonomous Microgrid in the Energy Internet," Energies, MDPI, vol. 8(11), pages 1-24, November.
    2. Danny Ochoa & Sergio Martinez, 2018. "Proposals for Enhancing Frequency Control in Weak and Isolated Power Systems: Application to the Wind-Diesel Power System of San Cristobal Island-Ecuador," Energies, MDPI, vol. 11(4), pages 1-25, April.
    3. Yiqi Liu & Jianze Wang & Ningning Li & Yu Fu & Yanchao Ji, 2015. "Enhanced Load Power Sharing Accuracy in Droop-Controlled DC Microgrids with Both Mesh and Radial Configurations," Energies, MDPI, vol. 8(5), pages 1-15, April.
    4. Ming-Tse Kuo & Ming-Chang Tsou, 2015. "Simulation of Standby Efficiency Improvement for a Line Level Control Resonant Converter Based on Solar Power Systems," Energies, MDPI, vol. 8(1), pages 1-18, January.

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