Analysis and Suppression of Circulating Current Caused by Carrier Phase Difference in Parallel Voltage Source Inverters With SVPWM

Although high-frequency circulating current exists in parallel-operated inverters, it has not attracted as much attention as low-frequency circulating current, and thus has not been analyzed in detail previously. In this paper, a mathematical model and analysis are presented, which reveal the spectr...

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Bibliographic Details
Published in:IEEE transactions on power electronics 2018-12, Vol.33 (12), p.11007-11020
Main Authors: Xueguang, Zhang, Li, Weiwei, Xiao, Yi, Wang, Gaolin, Xu, Dianguo
Format: Article
Language:English
Subjects:
Carrier phase difference
circulating current control
Computer simulation
Current carriers
Hardware
Inverters
Mathematical model
Modulation
parallel voltage source inverters
Phase shift
Support vector machines
Switches
switching frequency circulating current
Synchronization
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Summary:Although high-frequency circulating current exists in parallel-operated inverters, it has not attracted as much attention as low-frequency circulating current, and thus has not been analyzed in detail previously. In this paper, a mathematical model and analysis are presented, which reveal the spectrum components and their changing trends of the circulating currents caused by carrier phase differences. The impact of carrier phase difference on high-frequency circulating current is also analyzed and verified. A closed-loop control scheme is proposed to suppress the switching frequency circulating current caused by carrier phase difference. In addition, the deadbeat and closed-loop control are combined to suppress the low- and high-frequency circulating currents simultaneously, to improve the overall performance of circulating current suppression. The effectiveness of the proposed scheme is verified by the simulation and experimental results acquired from a laboratory platform.
ISSN:0885-8993
1941-0107
DOI:10.1109/TPEL.2018.2826577