High-performance transformerless online UPS
SCIE
SCOPUS
- Title
- High-performance transformerless online UPS
- Authors
- Park, JK; Kwon, JM; Kim, EH; Kwon, BH
- Date Issued
- 2008-08
- Publisher
- IEEE-INST ELECTRICAL ELECTRONICS ENGI
- Abstract
- In this paper, a high-performance single-phase transformerless online uninterruptible power supply (UPS) is proposed. The proposed UPS is composed of a four-leg-type converter, which operates as a rectifier, a battery charger/discharger, and an inverter. The rectifier has the capability of power-factor collection and regulates a constant dc-link voltage. The battery charger/discharger eliminates the need for the transformer and the increase of the number of battery and supplies the power demanded by the load to the dc-link capacitor in the event of the input-power failure or abrupt decrease of the input voltage. The inverter provides a regulated sinusoidal output voltage to the load and limits the output current under an impulsive load. The control of the dc-link voltage enhances the transient response of the output voltage and the utilization of the input power. By utilizing the battery charger/discharger, the overall efficiency of the system is improved, and the size, weight, and cost of the system are significantly reduced. Experimental results obtained with a 3-kVA prototype show a normal efficiency of over 95.6% and an input power factor of over 99.7%.
- Keywords
- battery charger/discharger; current-limiting technique; online uninterruptible power supply (UPS); power-factor correction; DESIGN; CONVERTER
- URI
- https://oasis.postech.ac.kr/handle/2014.oak/22595
- DOI
- 10.1109/TIE.2008.918606
- ISSN
- 0278-0046
- Article Type
- Article
- Citation
- IEEE TRANSACTIONS ON INDUSTRIAL ELECTRONICS, vol. 55, no. 8, page. 2943 - 2953, 2008-08
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