A novel communication-less frequency restoration technique in droop controlled inverter-based islanded AC Microgrid

Animesh Sahoo, Mihai Ciobotaru, Jayashri Ravishankar

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

2 Citations (Scopus)

Abstract

Active and Reactive power is shared between the inverters in an islanded AC Microgrid (MG) using droop control technique in a decentralized manner. Deviations in the frequency and voltage magnitudes, from their nominal values, are inevitable in the droop based power-sharing. To maintain the grid code, it is important to restore these parameters to their rated values, which is basically done by a secondary control layer in the hierarchical control system of an islanded AC Microgrid. This paper proposes a communication-less frequency restoration technique in the primary layer by adopting the property of Recursive Discrete Fourier Transform (RDFT) and Inverse Recursive Discrete Fourier Transform (IRDFT) in the droop control equation. This technique replicates the frequency response of a Band Pass Filter (BPF) and thus extracts the nominal frequency if there is a drift in frequency due to the active power-sharing. The proposed technique is validated with the help of simulation studies for the parallel operation of two three-phase inverters for various test cases.

Original languageEnglish
Title of host publicationProceedings of 2018 IEEE International Conference on Power Electronics, Drives and Energy Systems (PEDES)
Place of PublicationPiscataway, NJ
PublisherInstitute of Electrical and Electronics Engineers (IEEE)
Pages1-6
Number of pages6
ISBN (Electronic)9781538693162, 9781538693155
ISBN (Print)9781538693179
DOIs
Publication statusPublished - 2 Jul 2018
Event8th IEEE International Conference on Power Electronics, Drives and Energy Systems, PEDES 2018 - Chennai, India
Duration: 18 Dec 201821 Dec 2018

Conference

Conference8th IEEE International Conference on Power Electronics, Drives and Energy Systems, PEDES 2018
CountryIndia
CityChennai
Period18/12/1821/12/18

Keywords

  • AC Microgrid
  • VSI
  • Communication-less control
  • Power-sharing
  • Frequency restoration

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