The DC Link Energy Control Method of Dynamic Voltage Restorer System

DVR(Dynamic Voltage Restorer)에서의 직류에너지 제어 방법

  • Published : 2001.12.01

Abstract

Dynamic Voltage Restorer(DVR) which is installed between the supply and a critical load can restore voltage disturbances in distribution system. The restoration is based on injecting the same voltages as voltage sags. The ideal restoration is compensation to make the load voltages be unchanged. But voltage restoration involves real power or energy injection and the capability of energy storage is limited. So it must be considered how injection energy can be minimized and voltages can be made close to the voltages before fault. This paper describes conventional restoration techniques, which draw minimum energy from the DVR in order to correct a given voltage sag or swell. And this paper proposes a new concept of restoration technique to inject minimum energy. The proposed method is based on the definition of voltage tolerance in load side. Hence using the proposed method a particular disturbance can be corrected with less amount of storage energy compared to those of conventional methods.

Keywords

References

  1. Math H. J. Bollen, Understanding Power Quality Problems: Voltage Sags and Interruptions, New York, IEEE Press, 1999
  2. Johan H.R. Enslin, 'Unified Approach to Power Quality Mitigation,' Industrial Electronics, Proceedings. ISIE '98. IEEE International Symposium on Volume: 1, pp.8-20 https://doi.org/10.1109/ISIE.1998.707741
  3. K. Chan and A. Kara, 'Voltage Sags Mitigation with an Integrated Gate Commutated Thyristor Based Dynamic Voltage Restorer,' Harmonics and Quality of Power Proceedings, Proceedings. 8th International Conference On Volume:1, 1998, pp.561-565 https://doi.org/10.1109/ICHQP.1998.759971
  4. John Godsk Nielsen, Frede Blaabjerg and Ned Mohan, 'Control Stategies for Dynamic Voltage Restorer Compensating Voltage Sags with Phase Jump,' Applied Power Electronics Conference and Exposition, 2001. APEC 2001. Sixteenth Annual IEEE , Volume: 2 , 2001 pp.1267 -1273 https://doi.org/10.1109/APEC.2001.912528
  5. A.A.D.R. Perera, M. Vilathgamuwa and S.S Choi, 'Sag Correction with Minimum Storage Capacity,' Proc. of the International Power Engineering Conference, Singapore, 1999
  6. M. Vilathgamuwa, A.A.D Ranjith Perera, S.S. Choi and K.J. Tseng, 'Control of Energy Optimized Dynamic Voltage Restorer,' Industrial Electronics Society, IECON Proceedings The 25th Annual Conference of the IEEE Volume:2 1999, pp873-878 https://doi.org/10.1109/IECON.1999.816526
  7. 한국전력공사 발전처, 전력계통운용 자료집, 1986
  8. J. Arrillaga, N.R. Watson and S. Chen, Power System Quality Assessment, John Wiley & Sons, 2000