KIEE International Transaction on Electrical Machinery and Energy Conversion Systems

The Korean Institute of Electrical Engineers (대한전기학회)
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A Study on a Single-Phase Module UPS using a Three-Arm Converter/Inverter

  • Koo, Tae-Geun (Power Electronics Group at Korea Electro-technology Research Institute(KERI)) ;
  • Byun, Young-Bok (Power Electronics Group at Korea Electro-technology Research Institute(KERI)) ;
  • Joe, Ki-Yeon (Power Electronics Group at Korea Electro-technology Research Institute(KERI)) ;
  • Kim, Dong-Hee (School of Electrical and Electronic Engineering at Yeungnam University) ;
  • Kim, Chul-U (School of Electrical and Electronic Engineering at Pusan National University)
  • Published : 2003.01.01
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Abstract

The module UPS can flexibly implement expansion of power system capacities. Further-more, it can be used to build up the parallel redundant system to improve the reliability of power system operation. To realize the module UPS, load sharing without interconnection among parallel connecting modules as well as a small scale and lightweight topology is necessary. In this paper, the three-arm converter/inverter is compared with the general full-bridge and half-bridge topology from a practical point of view and chosen as the module UPS topology. The switching control approaches based on a pulse width modulation of the converter and inverter of the system are presented independently. The frequency and voltage droop method is applied to parallel operation control to achieve load sharing. Two prototype 3㎸A modules are designed and implemented to confirm the effectiveness of the pro-posed approaches. Experimental results show that the three-arm UPS system has a high power factor, a low distortion of output voltage and input current, and good load sharing characteristics.

Keywords

References

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