NDLI: Instantaneous Current-Sharing Control Strategy for Parallel Operation of UPS Modules Using Virtual Impedance

Content Provider	IEEE Xplore Digital Library
Author	Yu Zhang Mi Yu Fangrui Liu Yong Kang
Copyright Year	1986
Abstract	By regulating the inverter output current every switching cycle, instantaneous current-sharing control strategies are usually employed in paralleled modular uninterruptible power supplies (UPSs). In this paper, virtual impedance, which is usually utilized in the droop method, is firstly introduced to the instantaneous current-sharing control strategy to achieve good load current-sharing performance. The instantaneous circulating current model of the paralleled system is developed and the circulating impedance is derived as well to clearly identify the intrinsic nature of unequal sharing of load current. By inserting the virtual impedance to the circulating impedance with the help of proper control strategy, good current-sharing capability can be obtained. The parallel inductor, e.g., coupled inductor, which is generally added at the output of each inverter to reduce the circulating current among modules, can be, therefore, eliminated, contributing to reduced weight, volume, and cost. In the meantime, the system output-voltage regulation performance, e.g., amplitude and waveform quality, is not affected by the introduction of the virtual impedance. The designation of the virtual impedance is provided and its implementation is simple but rather effective. Experimental results are also provided to verify the feasibility of the proposed method.
Sponsorship	IEEE Power Electronics Society
Starting Page	432
Ending Page	440
Page Count	9
File Size	1490753
File Format	PDF
ISSN	08858993
Volume Number	28
Issue Number	1
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2013-01-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Impedance Voltage control Inverters Inductors Uninterruptible power systems Transient analysis Power harmonic filters virtual impedance Current sharing parallel uninterruptible power supplies (UPSs)
Content Type	Text
Resource Type	Article
Subject	Electrical and Electronic Engineering

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