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Title: Model Predictive Control for Paralleled Uninterruptible Power Supplies with an Additional Inverter Leg for Load-Side Neutral Connection
Authors: Oliveira, Tiago 
Caseiro, Luís Miguel Antunes 
Mendes, André 
Cruz, Sérgio 
Perdigão, Marina 
Keywords: model predictive control; uninterruptible power supply; multilevel converters; zero sequence circulating current; power quality
Issue Date: 2021
Publisher: MDPI
Project: Project SAICT-45-2017-POCI-01-0145-FEDER-029112— PTDC/EEI-EEE/29112/2017 
FCT - scholarship 2020.04803.BD 
Serial title, monograph or event: Energies
Volume: 14
Issue: 8
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 loadside 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.
ISSN: 1996-1073
DOI: 10.3390/en14082270
Rights: openAccess
Appears in Collections:FCTUC Eng.Electrotécnica - Artigos em Revistas Internacionais
I&D IT - Artigos em Revistas Internacionais

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