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

Tiago Oliveira, Luís Caseiro, André Mendes, Sérgio Cruz and Marina Perdigão
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Tiago Oliveira: Department of Electrical and Computer Engineering, 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
Sérgio Cruz: Department of Electrical and Computer Engineering, 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

Energies, 2021, vol. 14, issue 8, 1-29

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.

Keywords: model predictive control; uninterruptible power supply; multilevel converters; zero sequence circulating current; power quality (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2021
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (3)

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