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

Author

Listed:
  • 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)

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.

Suggested Citation

  • Xiao Fu & Huaibao Wang & Xiaoqiang Guo & Changli Shi & Dongqiang Jia & Chao Chen & Josep M. Guerrero, 2022. "A Novel Circulating Current Suppression for Paralleled Current Source Converter Based on Virtual Impedance Concept," Energies, MDPI, vol. 15(5), pages 1-22, March.
    • Handle: RePEc:gam:jeners:v:15:y:2022:i:5:p:1952-:d:766070
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    References listed on IDEAS

    as
    1. Waqar Uddin & Tiago D. C. Busarello & Kamran Zeb & Muhammad Adil Khan & Anil Kumar Yedluri & Hee-Je Kim, 2021. "Control Strategy Based on Arm-Level Control for Output and Circulating Current of MMC in Stationary Reference Frame," Energies, MDPI, vol. 14(14), pages 1-20, July.
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    Cited by:

    1. Hao Ding & Quanjie Li & Jing Yuan & Wei Wang & Mingming Li & Josep M. Guerrero, 2022. "A Novel Overlap-Time Effect Suppression for Current Source Converter," Energies, MDPI, vol. 15(16), pages 1-16, August.

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