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DC Component Suppression of Grid-Connected Z-Source Inverter Based on Disturbance Observer

Author

Listed:
  • Guofeng He

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

  • Junfang Lin

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

  • Guojiao Li

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

  • Yanfei Dong

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

  • Wenjie Zhang

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

Abstract

Regarding the problems of resonance and direct current (DC) components when the Z-source inverter (ZSI) without an isolation transformer is connected to the grid through an LCL filter, this paper proposes a novel DC component suppression strategy for a grid-connected ZSI based on the split capacitor method of disturbance observer (DOB). The split capacitor method is utilized to convert a third-order LCL filter into a first-order one to eliminate the resonance problem. The DC component of the inverter output voltage is regarded as an external disturbance, and the employed DOB is used to observe it, which is fed forward to suppress the DC disturbance component. Various comparison results of the simulation and experiment show that the proposed control strategy can effectively reduce grid-connected DC components injected into the grid at less than 0.5%, which decreases the DC component from 1.8% to 0.1%.

Suggested Citation

  • Guofeng He & Junfang Lin & Guojiao Li & Yanfei Dong & Wenjie Zhang, 2022. "DC Component Suppression of Grid-Connected Z-Source Inverter Based on Disturbance Observer," Energies, MDPI, vol. 15(15), pages 1-17, August.
    • Handle: RePEc:gam:jeners:v:15:y:2022:i:15:p:5700-:d:881377
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