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A Current Control Method for Grid-Connected Inverters

Author

Listed:
  • Wenping Zhang

    (Department of Electrical and Information Engineering, Tianjin University, Tianjin 300072, China
    Research Center, Ginlong Technologies Co., Ltd., Ningbo 315712, China)

  • Yiming Wang

    (Research Center, Ginlong Technologies Co., Ltd., Ningbo 315712, China)

  • Po Xu

    (Research Center, Ginlong Technologies Co., Ltd., Ningbo 315712, China)

  • Donghui Li

    (Department of Electrical and Information Engineering, Tianjin University, Tianjin 300072, China)

  • Baosong Liu

    (Research Center, Ginlong Technologies Co., Ltd., Ningbo 315712, China)

Abstract

It is simple to implement conventional current control with a proportional integral (PI) controller. However, system stability and dynamic performance are not perfect, particularly when operating under unfavorable conditions. In this paper, an improved control method is proposed by introducing a compensation unit. The compensation unit can effectively compensate the system’s phase around the crossover frequency, greatly enhancing the system’s phase margin and stability. It is also capable of handling weak-grid conditions. In this paper, the concept of the proposed compensation unit is explained first. Then, the corresponding mathematical model for the current control loop is built, and system bode diagrams for the conventional and proposed methods are compared. Furthermore, the effect of the parameters for the compensation unit is investigated, and an optimization method is proposed to determine optimal parameters. In addition, to handle weak-grid conditions, the proposed scheme is expanded by including the compensation unit in the grid’s feed-forward loop. Finally, an experimental platform is constructed, and the experimental results are presented to validate the proposed method.

Suggested Citation

  • Wenping Zhang & Yiming Wang & Po Xu & Donghui Li & Baosong Liu, 2023. "A Current Control Method for Grid-Connected Inverters," Energies, MDPI, vol. 16(18), pages 1-17, September.
    • Handle: RePEc:gam:jeners:v:16:y:2023:i:18:p:6558-:d:1238162
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