DC-Link Protection and Control in Modular Uninterruptible Power Supply

Jinghang Lu, Mehdi Savaghebi, Yajuan Guan, Saeed Golestan, Juan Carlos Vasquez Quintero, Josep M. Guerrero, Albert Marzabal

Research output: Contribution to journalJournal articleResearchpeer-review

7 Citations (Scopus)
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In this paper, a DC-link voltage protection (DCVP) control method is proposed to address the DC-link overvoltage issue due to power back-feeding in parallel Uninterruptible Power Supply (UPS) system. The proposed control method is able to protect the inverter against the excessive DC-link voltage, which increases the system reliability and robustness. Moreover, a current sharing control strategy is proposed by online regulating the virtual resistance of each UPS module. The proposed current sharing control strategy is able to address the circulating fundamental and harmonic current caused by the line impedance mismatching or power back-feeding issue in the UPS system. In addition, an improved consensus-based distributed controller is proposed to alleviate the overshoot issue during the transient process in voltage amplitude and frequency restoration. Finally, the feasibility of the proposed methods are verified by experimental results from the parallel UPS prototypes.
Original languageEnglish
Article number8060574
JournalI E E E Transactions on Industrial Electronics
Issue number5
Pages (from-to)3942 - 3953
Number of pages12
Publication statusPublished - May 2018


  • Anti-windup
  • Consensus control
  • Current sharing
  • DC-link voltage protection (DCVP)
  • Uninterruptible power supply (UPS)
  • consensus control
  • uninterruptible power supply (UPS)
  • dc-link voltage protection (DCVP)
  • current sharing

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    TROY: UPS SLC-TROY Project

    Guerrero, J. M., Vasquez, J. C., Zhang, C., Wei, B. & Gui, Y.



    Project: Research

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