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A Fixed-Time Zero Sequence Circulating Current Suppression Strategy Based on Extended Kalman Filter

Author

Listed:
  • Xiaopeng Li

    (College of Electrical Engineering & New Energy, China Three Gorges University, Yichang 443002, China
    School of Electrical and Control Engineering, Henan University of Urban Construction, Pingdingshan 467036, China)

  • Guofeng He

    (College of Electrical Engineering & New Energy, China Three Gorges University, Yichang 443002, China
    School of Electrical and Control Engineering, Henan University of Urban Construction, Pingdingshan 467036, China)

  • Yuanhao Zhou

    (School of Electrical and Control Engineering, Henan University of Urban Construction, Pingdingshan 467036, China)

  • Yanfei Dong

    (School of Electrical and Control Engineering, Henan University of Urban Construction, Pingdingshan 467036, China)

  • Hang Wang

    (College of Electrical Engineering & New Energy, China Three Gorges University, Yichang 443002, China)

Abstract

The operation of parallel inverters can enhance the reliability of power supply and meet the demand of the grid forming system; however, due to the difference in the Zero Sequence Voltage (ZSV) and the existence of the Zero Sequence Path (ZSP), the problem of Zero Sequence Circulating Current (ZSCC) inevitably occurs. This paper proposes a fixed-time control strategy based on the Extended Kalman Filter (EKF), used in order to suppress the ZSCC issue in a paralleled inverter system. Firstly, the detailed mathematical model of ZSCC is described, where the inductance perturbations are considered according to the generation mechanism of ZSCC, and a novel ZSCC controller is designed based on the principles of the fixed-time stability theory which can assure the action time of the zero vectors in one switching cycle. Secondly, to reduce the influence of the inductor parameters on the ZSCC control effect, the EKF is used to identify the online inductance parameters of the filter, and the robustness of the algorithm can be improved. Subsequently, based on the Lyapunov stability criterion, it has been proved that the proposed control strategy is fixed-time stable. Finally, the simulation and experiments are employed to demonstrate the effectiveness of the proposed control method.

Suggested Citation

  • Xiaopeng Li & Guofeng He & Yuanhao Zhou & Yanfei Dong & Hang Wang, 2025. "A Fixed-Time Zero Sequence Circulating Current Suppression Strategy Based on Extended Kalman Filter," Energies, MDPI, vol. 18(2), pages 1-22, January.
    • Handle: RePEc:gam:jeners:v:18:y:2025:i:2:p:408-:d:1569999
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