ProQuest
Abstract/Details

Optimal Protection Coordination of Microgrids Powered by Synchronverters During Unbalanced Faults

Montazeri, Parinaz.   University of Windsor (Canada) ProQuest Dissertations Publishing,  2023. 30249716.

Abstract (summary)

Distributed energy resources (DERs) (i.e., wind turbines, photovoltaic systems, gas microturbines, etc.) integrated into conventional distributed networks result in active distribution networks (ADNs), which can be evolved into microgrids. Microgrids can operate either in grid-connected or islanded modes. Providing clean energy, reducing fuel use, and increasing grid resiliency and sustainability are among the advantages of microgrids. However, the advantages offered would be in jeopardy if not adequately protected. Short circuit currents are among the most significant issues in microgrids. DERs are integrated into AC networks through power electronic components. Power electronic devices provide power without enough inertia to the system. The lack of enough inertia leads to system instabilities. Synchronverters are inverters that mimic the behavior of synchronous generators (SGs) and provide virtual inertia to the grid. However, synchronverters generate high inrush currents during faults. In this work, adaptive virtual impedance fault current limiters (VI-FCLs) are employed in the synchronverter controllers to limit their fault currents and protect inverter switches from overcurrents. The incorporation of synchronverters with VI-FCLs should be considered in the protection scheme. The optimal protection coordination (OPC) scheme is presented to determine the minimum operating time for all relays while assuring protection coordination requirements. This protection scheme is then evaluated on a Canadian 9-bus system. Simulation results verify the efficacy of the proposed control scheme to maintain the protection coordination among all relays under different operating scenarios.

Indexing (details)


Subject
Electrical engineering;
Engineering
Classification
0544: Electrical engineering
0537: Engineering
Identifier / keyword
Distributed energy resources; Distributed generators; Optimal protection coordination; Virtual impedance fault current limiter; Microgrids
Title
Optimal Protection Coordination of Microgrids Powered by Synchronverters During Unbalanced Faults
Author
Montazeri, Parinaz
Number of pages
86
Publication year
2023
Degree date
2023
School code
0115
Source
MAI 84/9(E), Masters Abstracts International
Place of publication
Ann Arbor
Country of publication
United States
ISBN
9798377611110
Advisor
Azzouz, Maher
Committee member
Gherib, Faouzi; Sakr, Ahmed Hamdi
University/institution
University of Windsor (Canada)
Department
ELECTRICAL ENGINEERING
University location
Canada -- Ontario, CA
Degree
M.A.Sc.
Source type
Dissertation or Thesis
Language
English
Document type
Dissertation/Thesis
Dissertation/thesis number
30249716
ProQuest document ID
2784774983
Copyright
Database copyright ProQuest LLC; ProQuest does not claim copyright in the individual underlying works.
Document URL
https://www.proquest.com/pqdtglobal/docview/2784774983/38863CF713D4616PQ