A novel phase-locked loop based on frequency detector and initial phase angle detector

Liang Wang*, Qirong Jiang, Lucheng Hong, Chunpeng Zhang, Yingdong Wei

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

121 Citations (Scopus)

Abstract

This paper proposes a new three-phase software phase-locked loop (PLL) that operates fast and accurately in unbalanced, polluted, and frequency deviating circumstances. The proposed PLL consists of a frequency detector and an initial phase angle detector. In the synchronous reference frame, the initial phase angle detector tracks a ramp phase angle, which is generated from frequency deviation of the inputs, with steady error. This detection error is utilized to estimate the actual grid frequency. Frequency adaptive moving average filters (MAFs) are applied in this new PLL to eliminate noises, harmonics, and negative sequence components. In this paper, the effect of discrete sampling on the MAFs is analyzed, and a linear interpolation is employed to enhance the performances of the MAFs. The stability of the proposed PLL is also analyzed, a sufficient stability condition is identified, and the design procedures of the control parameters are also presented. Simulations and experiments verify the performances of the novel PLL.

Original languageEnglish
Article number6397623
Pages (from-to)4538-4549
Number of pages12
JournalIEEE Transactions on Power Electronics
Volume28
Issue number10
DOIs
Publication statusPublished - 2013
Externally publishedYes

Keywords

  • Digital filter
  • grid synchronization
  • moving average filter (MAF)
  • phase-locked loop (PLL)

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Wang, L., Jiang, Q., Hong, L., Zhang, C., & Wei, Y. (2013). A novel phase-locked loop based on frequency detector and initial phase angle detector. IEEE Transactions on Power Electronics, 28(10), 4538-4549. Article 6397623. https://doi.org/10.1109/TPEL.2012.2236848