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Spectral Analysis of DC Link Ripple Currents in Three-Phase AC/DC/AC PWM Converters  

이동춘 (영남대학교 전자정보공학부)
박영욱 (한국항공우주산업)
석줄기 (영남대학교 전자정보공학부)
Publication Information
The Transactions of the Korean Institute of Power Electronics / v.7, no.3, 2002 , pp. 244-252 More about this Journal
Abstract
In this paper, do link ripple currents for three-phase ac/dc/ac PWM converters feeding adjustable speed ac machine drives are analysed in a frequency domain. The expression of the harmonic currents is developed by using switching functions of the converter and exponential courier series expansion. The effect of the displacement angle between the switching Periods of line-side converters and motor-side inverters on the dc link ripple currents is Investigated. Also, the influence of asynchronization of PWM is observed. The result of analysis is compared with frequency spectrum which results from PSIM simulation. The proposed analysis technique is useful to understand the principles of P% and to derive an equivalent model of the dc link capacitors in a high frequency range.
Keywords
Ac/dc/ac PWM converter; dc link ripple current; Fouler series; switching function;
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