Multi-Mode Operation for On-line Uninterruptible Power Supply System

Jinghang Lu, Mehdi Savaghebi, Saeed Golestan, Juan C. Vasquez, Josep M. Guerrero, Albert Marzabal

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To enhance the robustness and disturbance rejection ability of an on-line uninterruptible power supply (UPS) system, an internal model control-based dc-link voltage regulation method is proposed in this paper. Furthermore, the multimode operations of the on-line UPS system are investigated and their corresponding control strategies are proposed. The proposed control strategies are capable of achieving the seamless transition in traditional normal mode, photovoltaic-aided normal mode, enhanced eco-mode (EEM), and burn-in test mode (BTM). Meanwhile, the uninterruptible load voltage is promised during the mode transition. The small-signal analysis is also conducted to investigate the stability of EEM and BTM. Finally, extensive experimental results are provided to validate the effectiveness of the proposed methods.

Original languageEnglish
JournalI E E E Journal of Emerging and Selected Topics in Power Electronics
Issue number2
Pages (from-to)1181-1196
Publication statusPublished - 1. Jun 2019
Externally publishedYes


  • Burn-in test mode (BTM)
  • dc-link voltage
  • disturbance rejection
  • enhanced eco-mode (EEM)
  • internal model control (IMC)
  • photovoltaic (PV)-aided normal mode
  • robustness
  • seamless transfer
  • uninterruptible power supply (UPS)


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