A Critical Examination of Frequency-Fixed Second-Order Generalized Integrator-Based Phase-Locked Loops

Saeed Golestan, Seyyed-Yousef Mousazadeh Mousavi, Josep M. Guerrero, Juan Carlos Vasquez Quintero

Research output: Contribution to journalJournal articleResearchpeer-review

33 Citations (Scopus)


The implementation of a large number of single-phase phase-locked loops (PLLs) involves creating a fictitious quadrature signal. A popular approach for this purpose is using a second-order generalized integrator-based quadrature signal generator (SOGIQSG) because it results in an acceptable speed/accuracy tradeoff. The SOGI-QSG based PLL (or briefly the SOGI-PLL), in its standard form, involves a frequency feedback loop for adjusting the SOGI resonance frequency under frequency drifts. Some recent research works have reported that the speed/accuracy tradeoff of the SOGI-PLL can be considerably enhanced by removing the frequency feedback loop. In these methods, the SOGI resonance frequency is fixed at the nominal frequency and a compensation strategy for correcting errors caused under off-nominal frequencies are presented. The main aim of this letter is to provide a critical analysis of frequency-fixed SOGI-based PLLs (FFSOGI-PLLs) to highlight their real advantages and disadvantages.
Original languageEnglish
JournalI E E E Transactions on Power Electronics
Issue number9
Pages (from-to)6666 - 6672
Number of pages7
Publication statusPublished - Sep 2017


  • Synchronization
  • Quadrature signal generation
  • Phase-locked loop (PLL)
  • Second-order generalized integrator (SOGI)


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