Control strategy for three-phase four-wire PWM VSI parallel connected in UPS applications

Jappe, Tiago Kommers; Lazzarin, Telles Brunelli; Arbugeri, Cesar Augusto; Mussa, Samir Ahmad

doi:10.1109/isie.2014.6864654

Cited by 8 publications

(3 citation statements)

References 37 publications

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“…In the literature, there are two main solutions generally adopted in DC/AC converters of different applications. One of these solutions is characterized by the direct connection of the neutral point of the load to the mid-point of the DC bus [7,8]. The other possibility consists of using an extra leg in the inverter to which the neutral wire is connected [9][10][11][12].…”

Section: Introductionmentioning

confidence: 99%

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

et al. 2021

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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.

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Section: Introductionmentioning

confidence: 99%

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

et al. 2021

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“…Mesmo já sendo utilizado na indústria em inúmeras aplicações, o paralelismo de inversores continua sendo tópico de muitas pesquisas devido a sua complexidade e os inúmeros desafios que ainda estão por ser superados para se ter uma estratégia de controle padrão. Estudos na área de paralelismo de inversores monofásicos modulares [1], aplicações em UPS [2], paralelismo de inversores trifásicos a três e a quatro fios [3]- [5], comunicação entre os inversores [6], [7], diferentes arquiteturas de controle como o droop control [8]- [11] e controle de corrente [12], alimentação de diferentes cargas [11] e problemas como a circulação de corrente entre os inversores [13] são alguns dos tópicos ainda em evidência na literatura.…”

Section: Introductionunclassified

Estratégia de Paralelismo Baseado no Conceito de Impedância Virtual para Inversores Trifásicos a Quatro Fios

Mussa¹,

Arbugeri²,

Lazzarin³

et al. 2018

Eletrônica de Potência

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The paper proposes a strategy for parallel connection of three-phase inverters, which can be applied in UPS (uninterruptible power supply). The control strategy is based on the virtual impedance concept, with no communication among the inverters. The proposed strategy is highlighted by its easy implementation that is similar to the conventional control of one inverter. The main features of the proposed strategy are modularity, fast dynamic response and good static regulation, even under load disturbances or hot-swap connection of inverters. The digital design implementation of the control strategy is described and experimental verification using two fourwires VSI modules with rated power of 6 kVA each are reported herein.

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“…(Kim and Lee, 2007;Marzouki et al, 2010;Jin et al, 2012). Nowadays, they are used in a wide diversity of industrial applications such as uninterruptible power supplies ( Jappe et al, 2014), adjustable-speed drive (Hedayati et al, 2013), battery management (Maharjan et al, 2009), STATCOM (Scapini et al, 2014), etc. They are also a key element of distributed power generation systems (Olulope et al, 2013) as well as renewable energy production including wind energy (Fan et al, 2013;Wang et al, 2013), and photovoltaic grid tied systems (Buccella et al, 2013;Nnachi et al, 2013).…”

Section: Introductionmentioning

confidence: 99%

A hybrid controller for PWM active rectifiers based LCL filters

Marzouki

Hamouda

Fnaiech

2015

COMPEL: The International Journal for Computation and Mathematics in Electrical and Electronic Engineering

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Purpose – The purpose of this paper is to propose a new hybrid control method of pulse width modulation (PWM) active rectifiers tied to the grid through an LCL filter. The control method is designed with the aim to achieve a perfect regulation of the dc-bus voltage; a near unity input power factor (UIPF) operation as well as a high quality of the line currents. Design/methodology/approach – The proposed hybrid control method consists of a PI-based linear controller cascaded with a nonlinear one. The nonlinear controller (inner loop) is designed using the input-output feedback linearization (IOFL) theory. It should control both the dc-bus voltage and the input currents at the converter’s poles. The linear controller (outer loop) is devoted to control the reactive line current so as to achieve a near UIPF. Findings – A perfect regulation of the dc-bus voltage and a near UIPF operation are achieved. Moreover, a high quality of the line currents is obtained. The robustness and effectiveness of the proposed control method have been successfully tested under variation of the dc voltage reference as well as grid and load disturbances. Practical implications – The proposed method is useful for single-stage and two-stage grid connected photovoltaic systems, wind energy conversion, and distributed power generation systems. Originality/value – The main novelty of this paper is the combination of linear and nonlinear controllers with the aim to control a PWM active rectifier tied to the grid through a third-order LCL filter. In the opinion, such control method has not been applied to this converter in earlier research papers. The numerical simulations carried out under normal and abnormal conditions confirm the effectiveness of the proposed approach.

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Control strategy for three-phase four-wire PWM VSI parallel connected in UPS applications

Cited by 8 publications

References 37 publications

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

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

Estratégia de Paralelismo Baseado no Conceito de Impedância Virtual para Inversores Trifásicos a Quatro Fios

A hybrid controller for PWM active rectifiers based LCL filters

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