An accurate and robust adaptive notch filter‑based phase‑locked loop

Jinbo Li; Qin Wang; Lan Xiao; Zehao Liu; Qunfang Wu

An accurate and robust adaptive notch filter‑based phase‑locked loop

Vol. 20, No. 6, pp. 1514-1525, Nov. 2020

10.1007/s43236-020-00127-2

Adaptive notch filter (ANF)

Phase-locked loop (PLL)

Synchronization

Phase detection

Frequency estimation

Abstract

The use of an adaptive notch filter (ANF) is one of the most popular methods to block harmonics in a phase-locked loop (PLL). Existing ANFs suffer from drawbacks such as a low harmonic rejection capability, complex structure or instability. To improve the performance of ANF-based PLLs, an enhanced ANF (EANF) is proposed in this paper. Its structure, filtering characteristics and frequency-adaptive method are analyzed. Multiple EANFs can be easily cascaded and achieve adaptation through a common frequency feedback loop (FFL). A small signal model is provided, and its control parameters are tuned through the symmetrical optimum method. The harmonic rejection capability and stability of the proposed method are confirmed through simulation and experimental results.

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Cite this article

[IEEE Style]

J. Li, Q. Wang, L. Xiao, Z. Liu, Q. Wu, "An accurate and robust adaptive notch filter‑based phase‑locked loop," Journal of Power Electronics, vol. 20, no. 6, pp. 1514-1525, 2020. DOI: 10.1007/s43236-020-00127-2.

[ACM Style]

Jinbo Li, Qin Wang, Lan Xiao, Zehao Liu, and Qunfang Wu. 2020. An accurate and robust adaptive notch filter‑based phase‑locked loop. Journal of Power Electronics, 20, 6, (2020), 1514-1525. DOI: 10.1007/s43236-020-00127-2.