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Fault Analysis and Non-Redundant Fault Tolerance in 3-Level Double Conversion UPS Systems Using Finite-Control-Set Model Predictive Control

Author

Listed:
  • Luís Caseiro

    (Instituto de Telecomunicações, Pólo 2—Pinhal de Marrocos, P-3030-290 Coimbra, Portugal)

  • André Mendes

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

Abstract

Fault-tolerance is critical in power electronics, especially in Uninterruptible Power Supplies, given their role in protecting critical loads. Hence, it is crucial to develop fault-tolerant techniques to improve the resilience of these systems. This paper proposes a non-redundant fault-tolerant double conversion uninterruptible power supply based on 3-level converters. The proposed solution can correct open-circuit faults in all semiconductors (IGBTs and diodes) of all converters of the system (including the DC-DC converter), ensuring full-rated post-fault operation. This technique leverages the versatility of Finite-Control-Set Model Predictive Control to implement highly specific fault correction. This type of control enables a conditional exclusion of the switching states affected by each fault, allowing the converter to avoid these states when the fault compromises their output but still use them in all other conditions. Three main types of corrective actions are used: predictive controller adaptations, hardware reconfiguration, and DC bus voltage adjustment. However, highly differentiated corrective actions are taken depending on the fault type and location, maximizing post-fault performance in each case. Faults can be corrected simultaneously in all converters, as well as some combinations of multiple faults in the same converter. Experimental results are presented demonstrating the performance of the proposed solution.

Suggested Citation

  • Luís Caseiro & André Mendes, 2021. "Fault Analysis and Non-Redundant Fault Tolerance in 3-Level Double Conversion UPS Systems Using Finite-Control-Set Model Predictive Control," Energies, MDPI, vol. 14(8), pages 1-39, April.
  • Handle: RePEc:gam:jeners:v:14:y:2021:i:8:p:2210-:d:536843
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    References listed on IDEAS

    as
    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. Jun-Hyung Jung & Hyun-Keun Ku & Yung-Deug Son & Jang-Mok Kim, 2019. "Open-Switch Fault Diagnosis Algorithm and Tolerant Control Method of the Three-Phase Three-Level NPC Active Rectifier," Energies, MDPI, vol. 12(13), pages 1-17, June.
    3. Ariel Villalón & Marco Rivera & Yamisleydi Salgueiro & Javier Muñoz & Tomislav Dragičević & Frede Blaabjerg, 2020. "Predictive Control for Microgrid Applications: A Review Study," Energies, MDPI, vol. 13(10), pages 1-32, May.
    4. Kuei-Hsiang Chao & Chen-Hou Ke, 2020. "Fault Diagnosis and Tolerant Control of Three-Level Neutral-Point Clamped Inverters in Motor Drives," Energies, MDPI, vol. 13(23), pages 1-25, November.
    5. 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.
    Full references (including those not matched with items on IDEAS)

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