Practical control implementation of a three- to single-phase online UPS
SCIE
SCOPUS
- Title
- Practical control implementation of a three- to single-phase online UPS
- Authors
- Kim, EH; Kwon, JM; Park, JK; Kwon, BH
- Date Issued
- 2008-08
- Publisher
- IEEE-INST ELECTRICAL ELECTRONICS ENGI
- Abstract
- A high-performance three- to single-phase online uninterruptible power supply (UPS) is proposed. The proposed UPS is composed of a rectifier, a battery charger/discharger, and an inverter. The rectifier has the capability of power-factor correction and regulates a dc-link voltage. When the rectifier becomes unavailable or when the current required by the load exceeds the output rating of the rectifier, the charger/discharger supplies the power demanded by the load to a dc-link capacitor. The inverter provides a regulated sinusoidal output voltage and limits an output current under an impulsive load. New control algorithms of the rectifier, the charger/discharger, and the inverter are proposed. The proposed algorithms of the rectifier and the charger/discharger improve dynamic performance at step load change. To improve the transient response of the output voltage at outage of an input source, a mode change method of the charger/discharger is also proposed. Additionally, the proposed current-limit algorithm of the inverter can be implemented without additional hardware, and it increases the reliability of the UPS.
- Keywords
- adaptive gain control; charger/discharger; current-limiting technique; online uninterruptible power supply (UPS); power-factor correction (PFC); POWER-FACTOR; CONVERTER; RECTIFIER
- URI
- https://oasis.postech.ac.kr/handle/2014.oak/22596
- DOI
- 10.1109/TIE.2008.918476
- ISSN
- 0278-0046
- Article Type
- Article
- Citation
- IEEE TRANSACTIONS ON INDUSTRIAL ELECTRONICS, vol. 55, no. 8, page. 2933 - 2942, 2008-08
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