Proceedings of the KIEE Conference (대한전기학회:학술대회논문집)
- 2006.04b
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- Pages.267-269
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- 2006
New Voltage Sag/Swell Compensator Using Direct Power Conversion Method
직접전력변환 방식을 이용한 새로운 전압 sag/swell 보상기
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Cha, Han-Ju
(Chungnam National University) ;
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Lee, Dae-Dong
(Chungnam National University)
- Published : 2006.04.20
Abstract
In this paper, a new single phase voltage sag/swell compensator using direct power conversion is introduced. A new compensator consists of input/output filter, series transformer and direct ac-ac converter, which is a single-phase back-to-back PWM converter without dc-link capacitors. Advantages of the proposed compensator include: simple power circuit by eliminating dc-link electrolytic capacitors and thereby, improved reliability and increased life time of the entire compensator; simple PWM strategy to compensate voltage sag/swell at the same time and reduced switching losses in the ac-ac converter. Further, the proposed scheme is able to adopt simple switch commutation method without requiring complex four-step commutation method commonly required in the direct power conversion. Simulation results are shown to demonstrate the advantages of the new compensator and PWM strategy.
Keywords