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http://dx.doi.org/10.5370/KIEE.2012.61.2.199

Dynamic Voltage Restorer (DVR) for 6.6[kV]/60[Hz] Power Distribution System Using Two Quasi Z-Source AC-AC Converters  

Oum, Jun-Hyun (전남대학교 전기공학과)
Jung, Young-Gook (대불대학교 융합기술학부)
Lim, Young-Cheol (전남대학교 전기공학과)
Choi, Joon-Ho (전남대학교 전기공학과)
Publication Information
The Transactions of The Korean Institute of Electrical Engineers / v.61, no.2, 2012 , pp. 199-208 More about this Journal
Abstract
This paper proposes a quasi Z-source DVR(Dynamic Voltage Restorer) system with a series connection of the output terminals, to compensate the voltage variations in the 6.6[kV]/60[Hz] power distribution system. The conventional DVR using one quasi Z-source AC-AC converter has the advantage which it can compensate the voltage variations without the need for the additional energy storage device such as a battery, but it is impossible to compensate for the 50[%] under voltage sags. To solve this problem, a DVR system using two quasi Z-source AC-AC converters with the series connection of the output terminals is proposed. By controlling the duty ratio D in the buck-boost mode, the proposed system can control the compensation voltage. For case verification of the proposed system, PSIM simulation is achieved. As a result, in case that the voltage sags-swells occur 10[%], 20[%], 60[%] in power distribution system, and, in case that the 50[%] under voltage sags-swells continuously occur, all case could compensate by the proposed system. Especially, the compensated voltage THD was examined under the condition of the 10[%]~50[%] voltage sags and the 20[${\Omega}$]~100[${\Omega}$] load changes. The compensated voltage THD was worse for the higher load resistances and more severe voltage sags. Finally, In case of the voltage swells compensation, the compensation factor has approached nearly 1 regardless of the load resistance changes, while the compensation factor of voltage sags was related to the load variations.
Keywords
Quasi Z-soruce AC-AC converter; Series connection; Voltage sag-swell compensation; Power distribution system; Compensation factor; THD; Duty ratio;
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Times Cited By KSCI : 1  (Citation Analysis)
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1 Mark F. McGranaghan et al, "Voltage Sags in Industrial Systems", IEEE Trans. on Ind. Applicat., Vol.29, No.2, PP.397-403, 1993   DOI   ScienceOn
2 전영환, 김지원, 전진홍, "직렬 전압 주입에 의한 순간 전압 강하 보상기기에 관한 연구", 한국에너지공학회지, Vol. 10, No. 4, pp.310-317, 2001.
3 Y.W. Li, P.C. Loh, F. Blaabjerg, and D. M. Vilathgamuwa, "Investigation and Improvement of Transient Response of DVR at Medium Voltage Level", IEEE Trans. Ind. Applicat., Vol. 43, No. 5, pp. 1309-1319, 2007.   DOI   ScienceOn
4 M. Vilathgamuwa, A. A. D. R. Perera, S. S. Choi, and K. J. Tseng, "Control of Energy Optimized Dynamic Voltage Restorer", in Proc. IEEE IECON'99, 1999, pp. 873-878.
5 T. Jimichi, H. Fujita, and H. Akagi, "Design and Experimentation on a Dynamic Voltage Restorer Capable of Significantly Reducing an Energy- Storage Element", in Proc. IEEE IAS'05, 2005, pp. 896-903.
6 D. M. Vilathgamuwa, C. J. Gajanayake, P. C. Loh, and Y. W. Li, "Voltage Sag Compensation with Z-Source Inverter Based Dynamic Voltage Restorer", in Proc. IEEE IAS'06, 2006, pp. 2242-2248.
7 M.K. Nguyen, Y. G. Jung, and Y.C. Lim, "Single-Phase Z-Source Voltage Sag/Swell Compensator", in Proc. IEEE ISIE'09, 2009, 24-28.
8 이기택, 정영국, 임영철, "단상 Quasi Z-소스 동적 전압 보상기", 전력전자학회 논문지, Vol. 15, No. 4, pp.327-334, 2010.
9 D. Mahinda Vilathgamuwa et al, "Voltage Sag Compensation With Energy Optimized Dynamic Voltage Restorer", IEEE Trans., Power Delivery, Vol.18, No.3, pp.928-936, July 2003.   DOI   ScienceOn
10 Eric John, "Experience with a Static Series Compensation Device(DVR) at a Semiconductor Facility", ABB Power T&D Company Inc., April 1999.