High-performance online UPS using three-leg-type converter
Jin-Ha Choi
Jung-Min Kwon
Jee-Hoon Jung
Bong-Hwan Kwon
Dept. of Electron. & Electr. Eng., Pohang Univ. of Sci. & Technol., South Korea;
This paper appears in: Industrial Electronics, IEEE Transactions on
Publication Date: June 2005
Volume: 52,
Issue: 3
On page(s): 889- 897
ISSN: 0278-0046
INSPEC Accession Number: 8464615
Digital Object Identifier: 10.1109/TIE.2005.847575
Current Version Published: 2005-05-31
Abstract
A high-performance single-phase online uninterruptible power supply (UPS) is proposed. The UPS is composed of a three-leg-type converter which operates as a battery charger and an inverter. The first leg is controlled to charge the battery, and the third leg is controlled to make the output voltage. The common leg is controlled in line frequency. The charger and the inverter are controlled independently. The charger has the capability of power-factor correction while charging a battery. The inverter regulates output voltage and limits output current under an impulsive load. The three-leg-type converter reduces the number of switching devices. As a result, the system has less power loss and a low-cost structure. In the determination of the charger voltage, the nominal voltage is derived using the feedback linearization concept and then a perturbed voltage is determined for the reactive power control. The disturbance of input voltage is detected using a fast sensing technique of the input voltage. Experimental results obtained with a 3-VA prototype show a normal efficiency of over 87% and an input power factor of over 99%.
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