Proceedings of the KIPE Conference (전력전자학회:학술대회논문집)

The Korean Institute of Power Electronics (전력전자학회)
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DC Link Currents in Frequency Domain for Three-Phase AC/DC/AC PWM Converters

  • Park Young-Wook (School of Electrical Engineering and Computer Science, Yeungnam University) ;
  • Lee Dong-Choon (School of Electrical Engineering and Computer Science, Yeungnam University) ;
  • Seok Jul-Ki (School of Electrical Engineering and Computer Science, Yeungnam University)
  • Published : 2001.10.01
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Abstract

In this paper, dc link ripple currents for three-phase ac/dc/ac PWM converters are ana lysed in a frequency domain. The expression of the harmonic currents is developed by using switching functions and exponential Fourier series expansion. The dc link ripple currents with regard to power factor and modulation index are investigated. In addition, the effect of the displacement angle between the switching periods of line-side converters and load-side inverters on the dc link ripple current is studied. The result of the dc link current analysis is helpful in specifying the dc link capacitor size and its lifetime estimation.

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