A Circulating-Current Suppression Method for Parallel-Connected Voltage-Source Inverters With Common DC and AC Buses

Wei, Baoze; Guerrero, Josep M.; Vasquez, Juan C.; Guo, Xiaoqiang

doi:10.1109/tia.2017.2681620

Cited by 93 publications

(24 citation statements)

References 39 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Esta malha é utilizada com o intuito de limitar a corrente que circula pelos inversores, fazendo com que a divisão de corrente entre os inversores seja adequada. Também serve para evitar a circulação de corrente entre os módulos durante a operação do sistema, seja durante o regime permanente ou transitório [13]. O projeto desta malha de controle emprega o sistema de representação por unidade (pu), o qual é comumente usado na análise de sistemas de potência.…”

Section: Conversorunclassified

“…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

See 1 more Smart Citation

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

Mussa¹,

Arbugeri²,

Lazzarin³

et al. 2018

Eletrônica de Potência

View full text Add to dashboard Cite

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.

show abstract

Section: Conversorunclassified

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

View full text Add to dashboard Cite

show abstract

“…Three-phase UPSs found commercially and in scientific work are based, with slight variations, on a classical topology employing two-level PWM converters [4][5][6][7]. Despite being able to maintain power quality on both the mains side and the load side, its efficiency is limited due to the large switching losses in the electronic switches.…”

Section: Introductionmentioning

confidence: 99%

Design of an Highly Efficient AC-DC-AC Three-Phase Converter Using SiC for UPS Applications

2018

View full text Add to dashboard Cite

With the constant increase of energy consumption in the world, the efficiency of systems and equipment is becoming more important. Uninterruptible Power Supply (UPS) is an equipment that provides safe and reliable supply for critical load systems, that is, systems where a supply interruption can lead to economical or even human losses. The Double Conversion UPS is the most complete UPS class in terms of load protection, regulation, performance, and reliability, however, it has lower efficiency and higher cost because of its high number of power converters. Silicon Carbide devices are emerging as an opportunity to construct power converters with higher efficiency and higher power density. The main purpose of this work is to design a three-phase AC-DC-AC converter using Silicon Carbide for Double Conversion UPS applications. The aim is to maximize efficiency and minimize volume and mass. The methodologies to size and choose the main hardware components are described in detail. Experimental results obtained with the prototype prove the high efficiency and high power density achievable with Silicon Carbide Metal Oxide Semiconductor Field Effect Transistor (MOSFETs).

show abstract

“…Moreover, the circulating fundamental and harmonic current, which are caused by the power back-feeding and line impedance mismatching, are harmful to the stable operation of the UPS system, as these circulating currents lead to the increased power losses and even overloading one of the UPS units. The circulating current issue has been investigated by some previous works [24][25][26][27][28]; [24,28] proposed the circulating suppression methods to deal with zero sequence current in the common DC-bus inverter system. The PWM switching strategies were investigated by [25][26][27] to solve the circulating current caused by the common mode voltage.…”

mentioning

confidence: 99%

DC-Link Protection and Control in Modular Uninterruptible Power Supply

Savaghebi

Guan

et al. 2018

IEEE Trans. Ind. Electron.

Self Cite

View full text Add to dashboard Cite

In this paper, a DC-link voltage protection (DCVP) control method is proposed to address the DC-link overvoltage issue due to power back-feeding in parallel Uninterruptible Power Supply (UPS) system. The proposed control method is able to protect the inverter against the excessive DC-link voltage, which increases the system reliability and robustness. Moreover, a current sharing control strategy is proposed by online regulating the virtual resistance of each UPS module. The proposed current sharing control strategy is able to address the circulating fundamental and harmonic current caused by the line impedance mismatching or power back-feeding issue in the UPS system. In addition, an improved consensus-based distributed controller is proposed to alleviate the overshoot issue during the transient process in voltage amplitude and frequency restoration. Finally, the feasibility of the proposed methods are verified by experimental results from the parallel UPS prototypes. Index Terms-Uninterruptible Power Supply(UPS), DC link voltage protection, current sharing, consensus control, Anti-windup. I. INTRODUCTION RIVEN by the increasing importance of the Uninterruptible Power Supply (UPS) in the industry including enterprise IT, commercial telecom, data center and cloud computing area [1], the global market for the UPS system is projected to soar dramatically in the next few years. Meanwhile, the strong need for the UPS system to provide more reliable, efficient and secure electrical power supply for the modern digital equipment propels the UPS technology advancement by engineers and academic researchers [2]. According to the European Standard EN 62040-3 [3], the UPS systems are divided into on-line, off-line and lineinteractive UPSs. In an on-line UPS system, the load is always powered by the inverter regardless of the grid condition; the only exception is that when the overloading occurs and the bypass switch closes to connect the load with the grid. In offline and line-interactive UPS systems, however, the load power is supplied from the grid or a combination of the inverter and the grid, respectively [4]. The on-line UPS system is the most

show abstract

A Circulating-Current Suppression Method for Parallel-Connected Voltage-Source Inverters With Common DC and AC Buses

Cited by 93 publications

References 39 publications

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

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

Design of an Highly Efficient AC-DC-AC Three-Phase Converter Using SiC for UPS Applications

DC-Link Protection and Control in Modular Uninterruptible Power Supply

Contact Info

Product

Resources

About