Abstract
Abstract The increasing presence of harmonics in power system has caused a need for the development of analytical methods of studying harmonic current effects. This paper describes a new method for modeling a six-pulse DC motor drive. One of the main features is that this model is derived from the actual waveform, which can be more accurate than the traditional constant current source model. Computer simulation method is used to analyze the six-pulse DC motor drive system and to compute the steady state responses of the DC load current and the AC line currents. The currents can be presented as a convenient set of mathematical expressions. The harmonic contents of currents can be obtained using fast Fourier transforms (FFT). In this paper, the effect of unbalanced voltage source is also studied. In addition, a full understanding of the sensitivity of the harmonic currents to different operating conditions is introduced.
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