Pulsewidth Modulation of Z-Source Inverters With Minimum Inductor Current Ripple

This paper proposes the pulsewidth modulation (PWM) strategy of Z-source inverters (ZSIs) with minimum inductor current ripple. In existing PWM strategy with single-phase shoot-through, the shoot-through time interval is divided into six equal parts, therefore the three phase legs bear the equal sho...

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Bibliographic Details
Published in:IEEE transactions on industrial electronics (1982) 2014-01, Vol.61 (1), p.98-106
Main Authors: Tang, Yu, Xie, Shaojun, Ding, Jiudong
Format: Article
Language:English
Subjects:
Capacitors
Current ripple
Inductors
Inverters
Pulse width modulation
pulsewidth modulation (PWM)
single-phase shoot-through (SPST)
Switches
Topology
Voltage control
Z-source inverter (ZSI)
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Summary:This paper proposes the pulsewidth modulation (PWM) strategy of Z-source inverters (ZSIs) with minimum inductor current ripple. In existing PWM strategy with single-phase shoot-through, the shoot-through time interval is divided into six equal parts, therefore the three phase legs bear the equal shoot-through time interval. In this manner, the allotment and arrangement of the shoot-through state is easy to realize, but the inductor current ripple is not optimized. This causes to use relatively large inductors. In the proposed PWM strategy, the shoot-through time intervals of three phase legs are calculated and rearranged according to the active state and zero state time intervals to achieve the minimum current ripple across the Z-source inductor, while maintaining the same total shoot-through time interval. The principle of the proposed PWM strategy is analyzed in detail, and the comparison of current ripple under the traditional and proposed PWM strategy is given. Simulation and experimental results on the series ZSI are shown to verify the analysis.
ISSN:0278-0046
1557-9948
DOI:10.1109/TIE.2013.2240632