Power-sharing based on open-loop synchronization of inverters in an islanded AC microgrid

Animesh Sahoo, Kuthsav Thattai, Jayashri Ravishankar, Mihai Ciobotaru

Research output: Chapter in Book/Report/Conference proceedingConference proceeding contribution

3 Citations (Scopus)

Abstract

Accurate and fast estimation of magnitude, frequency, and phase of the grid voltage is an essential part of the synchronization process and power-sharing control among parallel connected inverter-based AC microgrids, while running in islanded mode. Synchronization can be done using both open-loop and closed-loop estimation techniques. The conventional closed-loop synchronization technique used is Synchronous Reference Frame based Phase Locked Loop (SRF-PLL), estimates the phase angle of the grid voltage with a typical settling time of one or multiple fundamental periods. Moreover, the SRF-PLL estimates both, the frequency and phase angle of the voltage in one single loop, thus a jump in the phase angle affects the frequency estimation, which will have a negative impact on the power sharing control. To overcome these issues, this paper proposes an open loop synchronization technique based on Teager-Kaiser Energy Operator (TKEO) and Cross Energy Operator (TKCEO) to estimate the grid voltage frequency and phase angle, respectively. Presented results show that the power-sharing with energy operator based calculations gives a better response when compared to classical SRF-PLL.

Original languageEnglish
Title of host publicationProceedings
Subtitle of host publicationIECON 2018 - 44th Annual Conference of the IEEE Industrial Electronics Society
Place of PublicationPiscataway, NJ
PublisherInstitute of Electrical and Electronics Engineers (IEEE)
Pages237-242
Number of pages6
ISBN (Electronic)9781509066841, 9781509066834
ISBN (Print)9781509066858
DOIs
Publication statusPublished - 2018
Event44th Annual Conference of the IEEE Industrial Electronics Society, IECON 2018 - Washington, United States
Duration: 20 Oct 201823 Oct 2018

Publication series

Name
ISSN (Print)1553-572X
ISSN (Electronic)2577-1647

Conference

Conference44th Annual Conference of the IEEE Industrial Electronics Society, IECON 2018
CountryUnited States
CityWashington
Period20/10/1823/10/18

Keywords

  • AC Microgrid
  • Phase-locked Loop
  • VSI
  • Energy Operator
  • Power-sharing

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