Simplified control strategy to improve AC-input-current waveform of parallel-connected current-type PWM rectifiers

Sato, Yukihiko; Kataoka, T.

doi:10.1049/ip-epa:19951809

Cited by 62 publications

(18 citation statements)

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“…There are three conventional methods to suppress the zero sequence circuiting current. The first method is that the fundamental frequency output isolation transformer is adopted by each inverter [5][6][7][14][15][16][17], the second is that DC power supplies are isolated with each other [8][9][10] or an isolated DC/DC converter between the DC power supply and the inverter is adopted by each inverter [11], the third method is that tap inductors are adopted between the same phase bridge arms [12,13]. The purpose of the first two methods is to cut off the zero sequence circuit, namely the zero sequence impedance is infinite.…”

Section: Introduction (Heading 1)mentioning

confidence: 99%

The zero sequence circulating current suppression based on virtual impedance

Tie-yan

Luo

2012

2012 Power Engineering and Automation Conference

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There are zero sequence circuits, when inverters work in parallel directly, and zero sequence circulating current would flow, when zero sequence voltage of the inverter is different with that of the gird. The mechanism of the zero sequence circulating current is analyzed. By the analysis of the influence of the power switch tube voltage-drop, the dead time of PWM and the most common two PWM methods on the zero sequence voltage, the zero sequence voltage is a periodic signal the frequency of which is triple of the fundamental frequency. A novel zero sequence circulating current suppression method based on virtual impedance is proposed by the analysis of the zero sequence output impedance of the inverter, and the zero sequence voltage harmonic impedance is increased to improve the performance. The results of simulations and experiments show that the circulating current is suppressed effectively.

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Section: Introduction (Heading 1)mentioning

confidence: 99%

The zero sequence circulating current suppression based on virtual impedance

Tie-yan

Luo

2012

2012 Power Engineering and Automation Conference

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“…If no common-mode impedance exists between the sysPaper IPCSD-06-100, presented at the 2003 Industry Applications Society Annual Meeting, Salt Lake City, UT, October 12-16, and approved for publication in the IEEE TRANSACTIONS ON tems, it is necessary to actively control common-mode current. Various control techniques have been proposed to control this common-mode circulating current [6], [7], [10]- [13]. This paper describes an ac-dc-ac drive system with an active rectifier and an inverter based on the actively clamped resonant dc-link (ACRDCL) converter.…”

Section: Introductionmentioning

confidence: 99%

Mitigating Circulating Common-Mode Currents Between Parallel Soft-Switched Drive Systems

Cuzner¹,

Nowak²,

Bendre³

et al. 2007

IEEE Trans. on Ind. Applicat.

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A mathematical model that is developed for a generalized drive system, including common-mode passive and active elements, is used to explore the issues of paralleling soft-switched resonant dc-link drive systems. Differences between the modulation pattern for each drive system cause common voltage disturbances, which lead to significant circulating currents between the drive systems. Control methods for actively compensating for common-mode circulating currents or reducing the commonmode voltage disturbances are investigated. Practical modifications to the drive system controls are implemented to reduce the circulating currents between paralleled systems.Index Terms-Component, drive system modeling, electromagnetic interference (EMI), paralleling power converters, softswitched power converters.

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“…Much research has been done in order to suppress or reduce such a kind of zero-sequence circulating currents. In general, four kinds of techniques can be found: isolation [8], high impedance [9], synchronized control [10], and active suppression [11], are used to eliminate such a kind of circulating current. In order to have all the DC/AC modules share the same active and reactive power, various kinds of parallel technology have been proposed [12]- [15].…”

Section: (A)mentioning

confidence: 99%

Thermal impact analysis of circulating current in high power modular online uninterruptible power supplies application

Zhang

Guerrero

Vasquez

2015

2015 17th European Conference on Power Electronics and Applications (EPE'15 ECCE-Europe)

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In a modular uninterruptible power supplies (UPS), each DC/AC module was designed to work in a circular way considering the reliability and power stress issues of the whole system. Thus unsynchronized PWMs will occur if any of the DC/AC modules is plugged in or out of the system at any time. On the other hand, modular difference is another issue that will bring such kind of circulating current. In order to reduce system size and cost, each module shares the same DC and AC bus without any isolation or passive elements in the system. Consequently, potential zero-sequence current is possible to occur and should be paid specific attention. In this paper, a four-module online UPS system is designed. And thermal and loss distribution condition are investigated under different circulating current condition with conventional three phase H-bridge topology.

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Simplified control strategy to improve AC-input-current waveform of parallel-connected current-type PWM rectifiers

Cited by 62 publications

References 0 publications

The zero sequence circulating current suppression based on virtual impedance

The zero sequence circulating current suppression based on virtual impedance

Mitigating Circulating Common-Mode Currents Between Parallel Soft-Switched Drive Systems

Thermal impact analysis of circulating current in high power modular online uninterruptible power supplies application

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