A Frequency-Fixed SOGI-Based PLL for Single-Phase Grid-Connected Converters

Furong Xiao, Lei Dong*, Li Li, Xiaozhong Liao

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

290 Citations (Scopus)

Abstract

Second-order generalized integrator (SOGI) based phase-locked loops (PLLs) are widely used for grid synchronization in single-phase grid-connected power converters. Previously, the estimated frequency of the PLL stage is fed back to the front-end SOGI block to make SOGI-PLLs frequency-Adaptive, which increases the implementation complexity, and makes the tuning sensitive, thus reducing stability margins. Alternatively, a frequency-fixed SOGI-based PLL (briefly called FFSOGI-PLL) is proposed to ensure stability and simple implementation in this letter. It is commonly known that the in-phase and quadrature-phase signals generated by the frequency-fixed SOGI are of different amplitudes in the presence of frequency drifts, which causes second-harmonic ripples in the estimated parameters of the PLL loop. To deal with this issue, a simple yet effective method is developed in FFSOGI-PLL. The standard SOGI-PLL is first introduced, followed by the working principle and small-signal model of FFSOGI-PLL. The FFSOGI-PLL is then compared with the SOGI-PLL in terms of stability and transient performance. Finally, experimental results are presented to demonstrate the effectiveness of FFSOGI-PLL.

Original languageEnglish
Pages (from-to)1713-1719
Number of pages7
JournalIEEE Transactions on Power Electronics
Volume32
Issue number3
DOIs
Publication statusPublished - Mar 2017

Keywords

  • Frequency-fixed second-order generalized integrator (SOGI)
  • SOGI
  • phase-locked loop (PLL)

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