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http://dx.doi.org/10.5207/JIEIE.2013.27.4.088

Parallel Operation of Three-Phase Four wire UPS using Droop Control  

Kim, Hyunseob (Dept. of Railway Electrical and Signaling Engineering, Seoul National University of Science and Technology)
Han, Jungho (Dept. of Railway Electrical and Signaling Engineering, Seoul National University of Science and Technology)
Song, Joong-Ho (Dept. of Electrical and Information Engineering, Seoul National University of Science and Technology)
Publication Information
Journal of the Korean Institute of Illuminating and Electrical Installation Engineers / v.27, no.4, 2013 , pp. 88-95 More about this Journal
Abstract
A new droop control method which can be applied to 3-phase 4-wire uninterruptible power supply is proposed in this paper. The droop control method for parallel operation is very attractive one as UPS parallel operation can be carried out without any data communication devices provided among UPS systems connected, but it reportedly shows a PnP(plug-and-play) problem. A basic reason why a circulating current could flow among parallel-connected UPS systems is clearly investigated as well when droop-controlled-ups systems are operated in the manner of PnP. The proposed algorithm is deduced from the investigated result and is basically structured to keep a balanced frequency and balanced voltage profile against power variation. This paper shows that balanced parallel operation of droop control method can be obtained under unbalanced load as well as balanced load conditions when PnP operation is needed and load change occurs.
Keywords
UPS(Uninterruptible Power Supply); Inverter; Droop Control; Parallel Operation;
Citations & Related Records
Times Cited By KSCI : 2  (Citation Analysis)
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