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A High-Frequency Isolated Online Uninterruptible Power Supply (UPS) System with Small Battery Bank for Low Power Applications

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  • Muhammad Aamir

    (Department of Electrical Engineering, Bahria University, Islamabad 44000, Pakistan
    Power Electronics and Renewable Energy Research Laboratory (PEARL), Department of Electrical Engineering, University of Malaya, Kuala Lumpur 50603, Malaysia)

  • Wajahat Ullah Tareen

    (Power Electronics and Renewable Energy Research Laboratory (PEARL), Department of Electrical Engineering, University of Malaya, Kuala Lumpur 50603, Malaysia)

  • Kafeel Ahmed Kalwar

    (Department of Electrical Engineering, DHA Suffa University, Karachi 75500, Pakistan)

  • Mudasir Ahmed Memon

    (Power Electronics and Renewable Energy Research Laboratory (PEARL), Department of Electrical Engineering, University of Malaya, Kuala Lumpur 50603, Malaysia)

  • Saad Mekhilef

    (Power Electronics and Renewable Energy Research Laboratory (PEARL), Department of Electrical Engineering, University of Malaya, Kuala Lumpur 50603, Malaysia)

Abstract

Uninterruptible power supplies (UPSs) are widely used to deliver reliable and high quality power to critical loads under all grid conditions. This paper proposes a high-frequency isolated online UPS system for low power applications. The proposed UPS consists of a single-stage AC-DC converter, boost DC-DC converter, and an inverter. The single-stage AC-DC converter provides galvanic isolation, input power factor correction, and continuous conduction of both input and output current. The low battery bank voltage is stepped up to high dc-link voltage by employing a high voltage gain boost converter, thus allows the reduction of battery bank to only 24 V parallel connected batteries. Operating batteries in parallel improves the battery performance and resolves the issues related to conventional battery banks that arrange the batteries in series combination. The inverter provides regulated output voltage to the load. A new cascaded slide mode (SM) and proportional-resonant (PR) control for the inverter has been proposed, which regulates the output voltage for both linear and non-linear loads. The controller shows excellent performance during load transients and step changes. Besides, the controller for boost converter and AC-DC converter is presented. Operating principle and experimental results of 1 kVA laboratory setup have been presented for the validation of proposed system.

Suggested Citation

  • Muhammad Aamir & Wajahat Ullah Tareen & Kafeel Ahmed Kalwar & Mudasir Ahmed Memon & Saad Mekhilef, 2017. "A High-Frequency Isolated Online Uninterruptible Power Supply (UPS) System with Small Battery Bank for Low Power Applications," Energies, MDPI, vol. 10(4), pages 1-20, March.
    • Handle: RePEc:gam:jeners:v:10:y:2017:i:4:p:418-:d:93861
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    References listed on IDEAS

    as
    1. Tareen, Wajahat Ullah & Mekhilef, Saad, 2016. "Transformer-less 3P3W SAPF (three-phase three-wire shunt active power filter) with line-interactive UPS (uninterruptible power supply) and battery energy storage stage," Energy, Elsevier, vol. 109(C), pages 525-536.
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    Cited by:

    1. Eduardo Augusto Oliveira Barbosa & Márcio Rodrigo Santos de Carvalho & Leonardo Rodrigues Limongi & Marcelo Cabral Cavalcanti & Eduardo José Barbosa & Gustavo Medeiros de Souza Azevedo, 2021. "High-Gain High-Efficiency DC–DC Converter with Single-Core Parallel Operation Switched Inductors and Rectifier Voltage Multiplier Cell," Energies, MDPI, vol. 14(15), pages 1-18, July.
    2. Wang, Kaifeng & Ye, Lin & Yang, Shihui & Deng, Zhanfeng & Song, Jieying & Li, Zhuo & Zhao, Yongning, 2023. "A hierarchical dispatch strategy of hybrid energy storage system in internet data center with model predictive control," Applied Energy, Elsevier, vol. 331(C).
    3. Liangliang Lu & Gaoshuai Shen & Haoran Xu & Qiaoling Tong & Run Min & Qiao Zhang & Jun Yuan & Ningyu Liu, 2022. "Triple-Mode Average Current Control with Valley Current Shaping for DCM/CRM/CCM Boost PFC Converter," Energies, MDPI, vol. 15(19), pages 1-23, October.
    4. Ye, Guisen & Gao, Feng & Fang, Jingyang, 2022. "A mission-driven two-step virtual machine commitment for energy saving of modern data centers through UPS and server coordinated optimizations," Applied Energy, Elsevier, vol. 322(C).

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