A Single Phase Uninterruptible Power System with a Gradationally Controlled Voltage Inverter

Author

Mori, Osamu ; Yamada, Masaki ; Iwata, Akihiko ; Maruyama, Shinichiro ; Okada, Joji ; Hatakeyama, Yoshihiro

Author_Institution

Mitsubishi Electr. Corp., Hyogo

fYear

2006

fDate

6-10 Nov. 2006

Firstpage

1956

Lastpage

1961

Abstract

We have developed a gradationally controlled voltage inverter which is capable of outputting a high-precision waveform even at low switching frequencies and have succeeded in putting it to practical use. This inverter uses plural inverters which have a binary or ternary DC-link voltage ratio with one another, and are connected in series to output the sum of their output voltages. The waveform of the resultant output voltage is quasi-sinusoidal. In this paper, a new UPS applying this technology is explained. The UPS with the high efficiency of 97% and the thin size of 29 mm/kVA has been realized by the miniaturization of the LC output filter and the loss reduction of the power devices

Keywords

invertors; power filters; switching convertors; uninterruptible power supplies; DC-link voltage ratio; LC output filter; UPS; gradationally controlled voltage inverter; high-precision waveform; plural inverters; single phase uninterruptible power system; Control systems; Electrical equipment industry; Filters; Industrial control; Network servers; Pulse width modulation inverters; Switching frequency; Uninterruptible power systems; Voltage control; Voltage fluctuations;

fLanguage

English

Publisher

ieee

Conference_Titel

IEEE Industrial Electronics, IECON 2006 - 32nd Annual Conference on

Conference_Location

Paris

ISSN

1553-572X

Print_ISBN

1-4244-0390-1

Type

conf

DOI

10.1109/IECON.2006.347466

Filename

4152963