Suppression of High-Frequency Circulating Current Caused by Asynchronous Carriers for Parallel Three-Phase Grid-Connected Converters

The parallel three-phase grid-connected converters sharing dc and ac bus can increase the system power level effectively. However, the circulating current will occur inevitably. The existing studies primarily focus on dc, fundamental, and low-frequency circulating current. The high-frequency circula...

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Bibliographic Details
Published inIEEE transactions on industrial electronics (1982) Vol. 65; no. 2; pp. 1031 - 1040
Main Authors Jiang, Weidong, Gao, Yan, Xiao, Benxian, Wang, Jinping, Ding, Xingxing, Wang, Lei
Format Journal Article
LanguageEnglish
Published New York IEEE 01.02.2018
The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subjects
Carrier synchronization
circulating current
Commutation
Current carriers
Electric converters
Frequency modulation
grid-connected converter
Hardware
Inductors
Modules
parallel
Pulse width modulation
Switches
Voltage control
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Summary:The parallel three-phase grid-connected converters sharing dc and ac bus can increase the system power level effectively. However, the circulating current will occur inevitably. The existing studies primarily focus on dc, fundamental, and low-frequency circulating current. The high-frequency circulating current (HFCC) caused by asynchronous carriers is studied emphatically in this paper, which is based on the analysis of the change of circulating current in one control cycle. A novel method to suppress HFCC caused by asynchronous carriers of modules is proposed. In this method, the carrier period of slave module is adjustable and the carrier period of the master module is constant. When a large phase shift between modules occurs, an adjusting cycle is inserted to carrier of slave module to realize resynchronizing with master module. It is noted that there is no other commutation between the two modules (expect the dq current reference), such as the carrier information. Finally, the feasibility and effectiveness of the proposed method are verified by experiments.
ISSN:0278-0046
1557-9948
DOI:10.1109/TIE.2017.2726985