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Development of a Novel Power Apparatus to Make up for Voltage Dips
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| Author(s) |
M. Ohshima; F. Nakamura; S. Tamai; Y. Yamamoto; H. Mori |
| Abstract |
Along with wide and deep penetration of electronics application into our modern society voltage dips
and momentary interruptions mainly due to lightning and snow damage on overhead transmission
lines has become to disturb normal operation of loads. UPS, which is mostly employed to protect
sensitive loads from them, has such limitations that it dissipates not less energy in running operation
because currents flow through two converters in series, that it is poor to feed electric motors which
occupy main loads in industrial plants and that it costs high to be applied in common. UPS can be
regarded not as omnipotent against voltage dips and short interruptions.
We have developed a novel power apparatus termed QBS (Quick Backup System) to supplement above
drawbacks in UPS, employing one reversible ac/dc converter and one high-speed switch. Normally
QBS supplies power directly from a commercial network to critical loads while the reversible
converter interconnects with it to charge the battery. When the critical bus voltage deviates from the
tolerance range QBS disconnects the high-speed switch and continues to feed the critical loads in UPS
mode. The whole power transition is completed within 2ms. QBS has already been put to practical
use in telecommunication center and electronics manufacturer of Japan. This paper presents
constitutional technologies developed to realize QBS and obtained experimental data in the field
demonstration test of a 100kVA QBS. |
| Download |
| Filename: | EPE2001 - PP00182 - Ohshima.pdf |
| Filesize: | 537 KB |
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| Type |
Members Only |
| Date |
Last modified 2004-03-11 by System |
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