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A Riding-through Technique for Seamless Transition between Islanded and Grid-Connected Modes of Droop-Controlled Inverters

Author

Listed:
  • Shang-Hung Hu

    (Department of Electrical Engineering, National Sun Yat-sen University, Kaohsiung 80424, Taiwan)

  • Tzung-Lin Lee

    (Department of Electrical Engineering, National Sun Yat-sen University, Kaohsiung 80424, Taiwan)

  • Chun-Yi Kuo

    (Department of Electrical Engineering, National Sun Yat-sen University, Kaohsiung 80424, Taiwan)

  • Josep M. Guerrero

    (Department of Energy Technology, Aalborg University, Aalborg 9100, Denmark)

Abstract

This paper presents a seamless transition method for a droop-controlled inverter. The droop control is suitable to make the inverter work as a voltage source in both islanded and grid-connected modes, however, the transfer between theses modes can result in a big inrush current that may damage the system. The proposed method allows the droop-controlled inverter to improve the transient response when transferring between modes, by detecting the inrush current, activating a current control loop during transients, and then transferring back to droop-controlled mode smoothly by using a virtual inductance loop. In addition, a local phase-locked-loop (PLL) is proposed to align the inverter voltage with the grid in order to reduce the transient current during the transition. Therefore, the droop-controlled inverter is able to operate in both grid-connected and islanded modes, providing as well a smooth transition between them, requiring neither synchronization signals nor grid-side information. The control algorithm and design procedure are presented. Experimental results from a laboratory prototype validate the effectiveness of the proposed method.

Suggested Citation

  • Shang-Hung Hu & Tzung-Lin Lee & Chun-Yi Kuo & Josep M. Guerrero, 2016. "A Riding-through Technique for Seamless Transition between Islanded and Grid-Connected Modes of Droop-Controlled Inverters," Energies, MDPI, vol. 9(9), pages 1-15, September.
    • Handle: RePEc:gam:jeners:v:9:y:2016:i:9:p:732-:d:77852
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    Cited by:

    1. Hua Han & Lang Li & Lina Wang & Mei Su & Yue Zhao & Josep M. Guerrero, 2017. "A Novel Decentralized Economic Operation in Islanded AC Microgrids," Energies, MDPI, vol. 10(6), pages 1-18, June.
    2. Mostafa Ahmadzadeh & Saeedollah Mortazavi & Mohsen Saniei, 2018. "Applying the Taguchi Method for Investigating the Phase-Locked Loop Dynamics Affected by Hybrid Storage System Parameters," Energies, MDPI, vol. 11(1), pages 1-20, January.

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