Journal of Power Electronics

The Korean Institute of Power Electronics (전력전자학회)
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LCL APF based on fractional-order fast repetitive control strategy

  • Pan, Guobing (College of Mechanical Engineering, Zhejiang University of Technology) ;
  • Gong, Fei (College of Mechanical Engineering, Zhejiang University of Technology) ;
  • Jin, Libing (College of Mechanical Engineering, Zhejiang University of Technology) ;
  • Wu, Hao (College of Mechanical Engineering, Zhejiang University of Technology) ;
  • Chen, Sihan (College of Mechanical Engineering, Zhejiang University of Technology)
  • Received : 2021.01.20
  • Accepted : 2021.08.11
  • Published : 2021.10.20
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Abstract

The LCL type active power filter (APF) with a traditional repetitive controller has drawbacks in terms of poor dynamic performance, large steady-state error, and difficult digital implementation. A fast repetitive control (RC) algorithm was proposed in this paper in an effort to improve the APF dynamic performance without worsening its stability. To eliminate the non-integer delay of the traditional RC, a fractional-order RC algorithm based on the Lagrangian Interpolation was developed. The proposed fast fractional-order RC (FFORC) strategy only needs 1/6 delay time when compared to the traditional RC. In addition, it can track the error signal quickly and obtain a higher steady-state accuracy. Furthermore, the double current loops control method with grid side current and inverter side current feedback is proposed to achieve active damping of the resonance peak of the LCL filter, which ensures that the APF system is stable. Simulation and experimental results are presented to verify the performance of the dynamic response and steady-state accuracy of the proposed FFORC strategy.

Keywords

Acknowledgement

This research is financially supported by Key R&D Program of Zhejiang Province, China (2021C01112) and The National Key Research and Development Program of China (2017YFA0700301).

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