An effective solution for regeneration protection in uninterruptible power supply

Jinghang Lu*, Josep M. Guerrero, Mehdi Savaghebi, Amer M.Y.M. Ghias, Yajuan Guan, Xiaochao Hou, Juan C. Vasquez

*Corresponding author for this work

Research output: Contribution to journalJournal articleResearchpeer-review

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In this paper, a regeneration protection solution is proposed to address the dc-link overvoltage issue and the unequal power sharing in the parallel uninterruptible power supply (UPS) systems. First, a dc-link voltage protection control strategy is proposed to protect the inverter against the excessive dc-link voltage that may trigger the protection mechanism of the UPS system. In addition, an active power-sharing control strategy by regulating the virtual resistance is proposed to solve the circulating current caused by UPS regeneration issue. Finally, the feasibility of the proposed regeneration protection solution is verified by experimental results from the parallel UPS system prototype.

Original languageEnglish
JournalIEEE Transactions on Industry Applications
Issue number3
Pages (from-to)3055-3065
Publication statusPublished - 1. May 2019


  • Active power sharing
  • dc-link voltage protection (dcVP)
  • uninterruptible power supply (UPS)
  • virtual resistance


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