A Novel Circulating Current Suppression for Paralleled Current Source Converter Based on Virtual Impedance Concept

Xiao Fu, Huaibao Wang, Xiaoqiang Guo, Changli Shi, Dongqiang Jia, Chao Chen and Josep M. Guerrero
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Xiao Fu: Electrical Engineering Department, Yanshan University, Qinhuangdao 066000, China
Huaibao Wang: Electrical Engineering Department, Yanshan University, Qinhuangdao 066000, China
Xiaoqiang Guo: Electrical Engineering Department, Yanshan University, Qinhuangdao 066000, China
Changli Shi: Institute of Electrical Engineering, Chinese Academy of Sciences, Beijing 100190, China
Dongqiang Jia: State Grid Beijing Electric Power Company, Beijing 100031, China
Chao Chen: State Grid Jiaxing Electric Power Supply Company, Jiaxing 314000, China
Josep M. Guerrero: Department of Energy Technology, Aalborg University, DK-9220 Aalborg, Denmark

Energies, 2022, vol. 15, issue 5, 1-22

Abstract: The circulating current is one of the important issues for parallel converters. It affects the system stable operation and degrades the power quality. In order to reduce the circulating current of the parallel converter and reduce the harmonic pollution to the power grid, a new circulating current suppression strategy is proposed for the parallel current source converter without any communication line. This strategy is able to realize the current sharing between parallel modules by changing the external characteristics of the parallel modules to thus suppress the circulating current among the parallel current source converters. The proposed control strategy adopts DC-side droop control and AC-side virtual impedance control. The DC-side droop control is used to generate the reference voltage of each parallel module, while the AC-side virtual impedance is used to the circulating current suppression. We performed a time domain test of the parallel converter, and the results show that the proposed control strategy reduced the RMS circulating current of the parallel converter by 50% and effectively reduced the grid-side current THD while ensuring the stable operation of the converter. The effectiveness of the proposed control strategy was, therefore, verified.

Keywords: current source converter; paralleled operation; suppression of circulating current; mathematical model; virtual impedance control (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2022
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (1)

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