Journal of Power Electronics

The Korean Institute of Power Electronics (전력전자학회)
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Active noise cancellation frequency-locked loop with a notch filter

  • Pan, Lei (School of Control and Mechanical Engineering, Tianjin Chengjian University) ;
  • Xu, Dongxing (School of Control and Mechanical Engineering, Tianjin Chengjian University) ;
  • Zhang, Jingmei (School of Control and Mechanical Engineering, Tianjin Chengjian University) ;
  • Yin, Chang (School of Control and Mechanical Engineering, Tianjin Chengjian University) ;
  • Wu, Zifeng (School of Control and Mechanical Engineering, Tianjin Chengjian University) ;
  • Guo, Yingjun (School of Electrical Engineering, Hebei University of Science and Technology)
  • Received : 2021.03.03
  • Accepted : 2021.09.07
  • Published : 2021.12.20
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Abstract

To improve the performance of frequency-locked loops (FLLs) under distorted grid conditions, a series of pre-filtering techniques have been added to remove harmonics. One of them is the FLL-based comb filter (COMB-FLL), which offers a high disturbance rejection capability. However, it has some disadvantages, such as approximating a fractional delay and compensating an accumulated round-of error in the digital implementation of COMB-FLL. To alleviate these problems, this study proposes an active noise cancellation (ANC) FLL with a notch filter (NF), which incorporates an NF and an ANC to improve the frequency-locking ability. In this research, the structure of a comb filter is simplified into an NF, and an ANC is creatively introduced to eliminate harmonics from the frequency signal obtained by FLL. Furthermore, ANC has been improved to make it suitable for electricity-related applications. The proposed FLL features a unique cascade structure, which has excellent frequency-locking ability and dynamic characteristics under normal, abnormal, and harmonically distorted grid conditions. The simulations and experimental results verify the validity and reliability of the proposed FLL.

Keywords

Acknowledgement

This work was supported in part by Tianjin Education Commission Scientific Research Project under Grant 2019KJ104, in part by New Energy and Smart Grid Technology Innovation Special Project of Hebei Provincial Key Research and Development Program under Grant 19214501D, and in part by Hebei Provincial Key Research and Development Program New Energy Industry Technology Innovation Special Project under Grant 20314501D.

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