Active noise cancellation frequency‑locked loop with a notch filter

Lei Pan; Dongxing Xu; Jingmei Zhang; Chang Yin; Zifeng Wu; Yingjun Guo

Active noise cancellation frequency‑locked loop with a notch filter

Vol. 21, No. 12, pp. 1743-1756, Dec. 2021

10.1007/s43236-021-00310-z

Frequency-locked loop

Comb filter

Grid synchronization

Active noise cancellation

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-off 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.

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Cite this article

[IEEE Style]

L. Pan, D. Xu, J. Zhang, C. Yin, Z. Wu, Y. Guo, "Active noise cancellation frequency‑locked loop with a notch filter," Journal of Power Electronics, vol. 21, no. 12, pp. 1743-1756, 2021. DOI: 10.1007/s43236-021-00310-z.

[ACM Style]

Lei Pan, Dongxing Xu, Jingmei Zhang, Chang Yin, Zifeng Wu, and Yingjun Guo. 2021. Active noise cancellation frequency‑locked loop with a notch filter. Journal of Power Electronics, 21, 12, (2021), 1743-1756. DOI: 10.1007/s43236-021-00310-z.