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

Droop Control을 이용한 3상 4선식 UPS의 병렬운전

  • 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)
  • 김현섭 (서울과학기술대학교 철도전문대학원) ;
  • 한정호 (서울과학기술대학교 철도전문대학원) ;
  • 송중호 (서울과학기술대학교 전기정보공학과)
  • Received : 2013.02.13
  • Accepted : 2013.03.19
  • Published : 2013.04.30

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

References

  1. W. C. Lee, D. S. Hyun, "A Master and Slave Control Strategy for Parallel Operation of Three-Phase UPS Systems with Different Ratings", Journal of the Korean Institute Power Electronics, vol 9, no 6, pp. 341-349, Aug. 2004.
  2. W. J. Choi, H. J. Jong, "Design of the Fuel Cell Powered Line-Interactive UPS System", Jounal of the Korean Institute od llluminating and Electrical Installation Engineer, vol. 18, no. 6, pp. 205-212, Nov. 2004. https://doi.org/10.5207/JIEIE.2004.18.6.205
  3. J. M. Guerrero, L. García de Vicuna, and J. Uceda, "Uninterruptible power supply systems provide protection," IEEE Ind. Electron. Mag., vol. 1, no. 1, pp. 28-38, 2007.
  4. J. M. Guerrero, L. Hang, and J. Uceda, "Control of distributed uninterruptible power supply systems," in IEEE Trans. Ind. Electron., Aug. 2008, vol. 55, no. 8, pp. 2845-2859, 2008. https://doi.org/10.1109/TIE.2008.924173
  5. E.-H. Kim, J.-M. Kwon, J.-K. Park, and B.-H. Kwon, "Practical control implementation of a three- to singlephase online UPS," IEEE Trans. Ind. Electron., vol. 55, no. 8, pp. 2933-2942, 2008. https://doi.org/10.1109/TIE.2008.918476
  6. R. S. Herrera and P. Salmer'on, "Instantaneous reactive power theory: A comparative evaluation of different formulations," IEEE Trans. Power Del. vol. 22, no. 1, pp. 595-604, Jan. 2007. https://doi.org/10.1109/TPWRD.2006.881468
  7. M. G. Villalva and E. R. Filho, "3-D space vector PWM for three leg four-wire voltage source inverters," in Proc. IEEE PESC, pp. 3946-3951, 2004.
  8. N. Pogaku, M. Prodanovic, and T. Green, "Modeling, analysis and testing of autonomous operation of an inverter-based microgrid," IEEE Trans. Power Electron., vol. 22, no. 2, pp. 613-625, Mar. 2007. https://doi.org/10.1109/TPEL.2006.890003

Cited by

  1. The Study of the Circulation Current Control Scheme on Single Phase Inverter System vol.28, pp.2, 2014, https://doi.org/10.5207/JIEIE.2014.28.2.060