Adaptive grid synchronization technique for single-phase inverters in AC microgrid

Animesh Sahoo, Khizir Mahmud, Mihai Ciobotaru, Jayashri Ravishankar

Research output: Chapter in Book/Report/Conference proceedingConference proceeding contributionpeer-review

8 Citations (Scopus)


Second order generalized integrator (SOGI) based phase-locked loop (PLL) technique employs two interdependent loops one for frequency and the other for phase-angle during the synchronization process in single-phase inverters and thus called the closed loop technique. During grid transients like frequency or phase jumps such synchronization technique suffers from PLL loop delay which affects the fault ride-through capability of the inverter control. Additionally, the frequency-adaptive nature of the SOGI based PLL makes it complex to implement and reduces the stability margin as well. To avoid such issues, this paper proposes a hybrid SOGI based PLL technique in which the frequency required for quadratic signal generation is provided by Teager energy operator based frequency estimation and the phase from the arctangent of the signals generated from SOGI. In the proposed technique there is no interdependent loop, thus called as open loop estimation. Moreover there is no tuning issue unlike the conventional SOGI based PLL.

Original languageEnglish
Title of host publication2019 IEEE Energy Conversion Congress and Exposition (ECCE)
Place of PublicationPiscataway, NJ
PublisherInstitute of Electrical and Electronics Engineers (IEEE)
Number of pages6
ISBN (Electronic)9781728103952, 9781728103945
ISBN (Print)9781728103969
Publication statusPublished - 2019
Event11th Annual IEEE Energy Conversion Congress and Exposition, ECCE 2019 - Baltimore, United States
Duration: 29 Sep 20193 Oct 2019

Publication series

ISSN (Print)2329-3721
ISSN (Electronic)2329-3748


Conference11th Annual IEEE Energy Conversion Congress and Exposition, ECCE 2019
Country/TerritoryUnited States


  • Single-phase Inverter
  • Synchronization
  • Teager energy operator
  • Arctangent
  • Phase-jump
  • Frequency-jump


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