Title :
A simple method for improving input power factor of single-phase UPS
Author :
Lee, Jia-You ; Tsai, Win-Inne ; Chang, Yu-Ming
Author_Institution :
Dept. of Electr. Eng., Nat. Cheng Kung Univ., Tainan, Taiwan
fDate :
28 Oct-1 Nov 1991
Abstract :
A simple method for improving the input power factor of a single-phase online UPS (uninterruptible power supply) by making the DC-bus capacitance as small as possible is proposed. A feedforward modulation scheme is provided for solving the rapid DC-bus voltage fluctuation problem due to insufficient filtering. A discrete-time model of the UPS with the proposed scheme and a design technique for the compensators are also developed. Finally, a laboratory prototype 1kVA single-phase online UPS is set up to experimentally verify the predicted and analyzed results. The proposed UPS features a high input power factor, fast transient response, high efficiency, light weight, and small size
Keywords :
power factor; uninterruptible power supplies; 1 kVA; DC-bus capacitance; discrete-time model; feedforward modulation; input power factor; single-phase UPS; uninterruptible power supply; Batteries; Capacitance; Capacitors; Filtering; Inverters; Laboratories; Power harmonic filters; Reactive power; Uninterruptible power systems; Voltage fluctuations;
Conference_Titel :
Industrial Electronics, Control and Instrumentation, 1991. Proceedings. IECON '91., 1991 International Conference on
Conference_Location :
Kobe
Print_ISBN :
0-87942-688-8
DOI :
10.1109/IECON.1991.239181
