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Research on LADRC of Grid-Connected Inverter Based on LCCL

Author

Listed:
  • Guofeng He

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

  • Guanxu Chen

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

A grid-connected inverter’s stability is easily influenced by the system’s internal and external characteristics, especially when the grid-connected inverter is connected to the grid by an LCL filter, which complicates the system design and operating conditions. To handle the problem of disturbance in the high-order grid-connected system of the inverter, a linear active disturbance rejection control (LADRC) strategy based on LCCL (which divides the capacitor of the LCL filter into two halves in a specified proportion) is proposed in this paper. First, the system is reduced from third order to first order by using the split capacitor control method, which solves the difficulties of complicated LCL grid-connected inverter controller design and easy resonance. Meanwhile, the internal and external disturbances of the inverter system are treated as generalized disturbances. Then, the LADRC control is used to adjust the closed-loop system’s parameters, which enhances the quality of the grid current and the system’s stability. Finally, the impacts of PI and LADRC control on the power mutation and voltage drop of an LCCL grid-connected inverter are compared by the experiments. The experimental results show the effectiveness of the proposed LADRC control strategy.

Suggested Citation

  • Guofeng He & Guanxu Chen & Yanfei Dong & Guojiao Li & Wenjie Zhang, 2022. "Research on LADRC of Grid-Connected Inverter Based on LCCL," Energies, MDPI, vol. 15(13), pages 1-12, June.
    • Handle: RePEc:gam:jeners:v:15:y:2022:i:13:p:4686-:d:848344
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