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Model Predictive Control for Paralleled Uninterruptible Power Supplies with an Additional Inverter Leg for Load-Side Neutral Connection

Author

Listed:
  • Tiago Oliveira

    (Department of Electrical and Computer Engineering, University of Coimbra—Pole 2, P-3030-290 Coimbra, Portugal
    Instituto de Telecomunicações, University of Coimbra—Pole 2, P-3030-290 Coimbra, Portugal)

  • Luís Caseiro

    (Instituto de Telecomunicações, University of Coimbra—Pole 2, P-3030-290 Coimbra, Portugal)

  • André Mendes

    (Department of Electrical and Computer Engineering, University of Coimbra—Pole 2, P-3030-290 Coimbra, Portugal
    Instituto de Telecomunicações, University of Coimbra—Pole 2, P-3030-290 Coimbra, Portugal)

  • Sérgio Cruz

    (Department of Electrical and Computer Engineering, University of Coimbra—Pole 2, P-3030-290 Coimbra, Portugal
    Instituto de Telecomunicações, University of Coimbra—Pole 2, P-3030-290 Coimbra, Portugal)

  • Marina Perdigão

    (Instituto de Telecomunicações, University of Coimbra—Pole 2, P-3030-290 Coimbra, Portugal)

Abstract

Uninterruptible Power Supplies (UPS) have been demonstrated to be the key technology in feeding either single- and three-phase loads in a wide range of critical applications, such as high-tier datacenters and medical facilities. To increase the overall system power capacity and resilience, UPS systems are usually connected in parallel. When UPS systems are parallel connected, a circulating current can rise, inhibiting correct system operation. Moreover, having a controlled load power distribution is another fundamental requirement in paralleled UPS systems. However, strategies to ensure these two topics have not been explored to date for UPS systems with a load-side neutral connection. This paper proposes an innovative Finite Control Set Model Predictive Control (FCS-MPC) strategy that ensures circulating current elimination and controlled load power distribution for paralleled UPS systems that use an additional inverter leg for load neutral point connection. Additionally, a system topology based on two parallel-connected UPS systems that can simultaneously supply single- and three-phase critical loads is proposed. Experimental results show the effectiveness and robustness of the proposed control techniques even when different types of loads are connected to the UPS systems.

Suggested Citation

  • Tiago Oliveira & Luís Caseiro & André Mendes & Sérgio Cruz & Marina Perdigão, 2021. "Model Predictive Control for Paralleled Uninterruptible Power Supplies with an Additional Inverter Leg for Load-Side Neutral Connection," Energies, MDPI, vol. 14(8), pages 1-29, April.
    • Handle: RePEc:gam:jeners:v:14:y:2021:i:8:p:2270-:d:538374
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    References listed on IDEAS

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    1. Hussain Sarwar Khan & Muhammad Aamir & Muhammad Ali & Asad Waqar & Syed Umaid Ali & Junaid Imtiaz, 2019. "Finite Control Set Model Predictive Control for Parallel Connected Online UPS System under Unbalanced and Nonlinear Loads," Energies, MDPI, vol. 12(4), pages 1-20, February.
    2. Miveh, Mohammad Reza & Rahmat, Mohd Fadli & Ghadimi, Ali Asghar & Mustafa, Mohd Wazir, 2016. "Control techniques for three-phase four-leg voltage source inverters in autonomous microgrids: A review," Renewable and Sustainable Energy Reviews, Elsevier, vol. 54(C), pages 1592-1610.
    3. Tiago Oliveira & Luís Caseiro & André Mendes & Sérgio Cruz, 2020. "Finite Control Set Model Predictive Control for Paralleled Uninterruptible Power Supplies," Energies, MDPI, vol. 13(13), pages 1-30, July.
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    Cited by:

    1. Mateusz Pietrala & Piotr Leśniewski & Andrzej Bartoszewicz, 2021. "Sliding Mode Control with Minimization of the Regulation Time in the Presence of Control Signal and Velocity Constraints," Energies, MDPI, vol. 14(10), pages 1-23, May.
    2. Tiago Oliveira & André Mendes & Luís Caseiro, 2022. "Model Predictive Control for Solid State Transformers: Advances and Trends," Energies, MDPI, vol. 15(22), pages 1-27, November.
    3. Paolo Mercorelli, 2022. "Model Predictive Control for Energy Optimization in Generators/Motors as Well as Converters and Inverters for Futuristic Integrated Power Networks," Energies, MDPI, vol. 15(16), pages 1-4, August.

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