Analysis and Calculation of DC-Link Current and Voltage Ripples for Three-Phase Inverter With Unbalanced Load

In this paper, an analysis and calculation of the dc-link current and voltage ripples are presented for a three-phase inverter with unbalanced load. A comparison of the dc-link average and root-mean-square (rms) currents between considering and ignoring high frequency harmonics of the output current...

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Bibliographic Details
Published in:IEEE transactions on power electronics 2015-10, Vol.30 (10), p.5401-5412
Main Authors: Pei, Xuejun, Zhou, Wu, Kang, Yong
Format: Article
Language:English
Subjects:
Accuracy
Capacitors
DC-link current
double fundamental frequency harmonic
Electric currents
Harmonic analysis
Inductors
Inverters
Power harmonic filters
Power supply
Pulse width modulation
Switches
symmetrical components method
Symmetry
unbalanced load
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Summary:In this paper, an analysis and calculation of the dc-link current and voltage ripples are presented for a three-phase inverter with unbalanced load. A comparison of the dc-link average and root-mean-square (rms) currents between considering and ignoring high frequency harmonics of the output current is drawn. It is shown that high frequency harmonic currents have little effect on the dc-link current, and therefore, they can be ignored. Based on the symmetrical components method, the dc-link average and harmonic rms currents are derived, and the dc-link voltage ripple is compared between the balanced and unbalanced loads. It can be found that the dc-link current and voltage ripples consist of not only high frequency harmonics but also the double fundamental frequency harmonic, and the voltage ripple is independent of the positive-sequence component and determined by the negative-sequence component, under the unbalanced load. Experimental results are shown to verify the accuracy of the theoretical analysis.
ISSN:0885-8993
1941-0107
DOI:10.1109/TPEL.2014.2375353