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; Josep M. Guerrero

doi:10.3390/en15051952

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, Josep M. Guerrero

^*Corresponding author for this work

Research output: Contribution to journal › Journal article › Research › peer-review

5 Citations (Scopus)

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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.

Original language	English
Article number	1952
Journal	Energies
Volume	15
Issue number	5
ISSN	1996-1073
DOIs	https://doi.org/10.3390/en15051952
Publication status	Published - Mar 2022

Bibliographical note

Funding Information:
Funding: This work was supported by the National Key Research and Development Program of China (2021YFB2601600), Hebei Province Natural Science Foundation (F2020203013) and Hebei Province 333 Talent Program (A202005001).

Publisher Copyright:
© 2022 by the authors. Licensee MDPI, Basel, Switzerland.

Keywords

Current source converter
Mathematical model
Paralleled operation
Suppression of circulating current
Virtual impedance control

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Open Access articleFinal published version, 5.14 MBLicence: CC BY 4.0

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title = "A Novel Circulating Current Suppression for Paralleled Current Source Converter Based on Virtual Impedance Concept",

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, Mathematical model, Paralleled operation, Suppression of circulating current, Virtual impedance control",

author = "Xiao Fu and Huaibao Wang and Xiaoqiang Guo and Changli Shi and Dongqiang Jia and Chao Chen and Guerrero, {Josep M.}",

note = "Funding Information: Funding: This work was supported by the National Key Research and Development Program of China (2021YFB2601600), Hebei Province Natural Science Foundation (F2020203013) and Hebei Province 333 Talent Program (A202005001). Publisher Copyright: {\textcopyright} 2022 by the authors. Licensee MDPI, Basel, Switzerland.",

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doi = "10.3390/en15051952",

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AU - Fu, Xiao

AU - Wang, Huaibao

AU - Guo, Xiaoqiang

AU - Shi, Changli

AU - Jia, Dongqiang

AU - Chen, Chao

AU - Guerrero, Josep M.

N1 - Funding Information: Funding: This work was supported by the National Key Research and Development Program of China (2021YFB2601600), Hebei Province Natural Science Foundation (F2020203013) and Hebei Province 333 Talent Program (A202005001). Publisher Copyright: © 2022 by the authors. Licensee MDPI, Basel, Switzerland.

PY - 2022/3

Y1 - 2022/3

N2 - 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.

AB - 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.

KW - Current source converter

KW - Mathematical model

KW - Paralleled operation

KW - Suppression of circulating current

KW - Virtual impedance control

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DO - 10.3390/en15051952

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JO - Energies

JF - Energies

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M1 - 1952

ER -

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

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