Transient Stability Analysis of Islanded AC Microgrids with a Significant Share of Virtual Synchronous Generators

Chang Yuan, Peilin Xie, Dan Yang, Xiangning Xiao

Research output: Contribution to journalJournal articleResearchpeer-review

7 Citations (Scopus)

Abstract

As an advanced control method that could bring extra inertia and damping characteristics to inverter-based distributed generators, the virtual synchronous generator (VSG) has recently drawn considerable attention. VSGs are expected to enhance the frequency regulation capability of the local power grid, especially the AC microgrid in island mode. However, the cost of that performance promotion is potential instability. In this paper, the unstable phenomena of the islanded microgrid dominated by SGs and distributed generators (DSs) are addressed after mathematical modeling and detailed eigenvalue analyses respectively. The influence of VSG key parameters, e.g., virtual inertia, damping factor, and droop coefficient on system stability is investigated, and the corresponding mathematical calculation method of unstable region is obtained. The theoretical analysis is well supported by time domain simulation results. The predicted frequency oscillation suggests the consideration of stability constrain during the VSG parameters design procedure.
Original languageEnglish
Article number44
JournalEnergies
Volume11
Issue number1
Pages (from-to)1-19
Number of pages19
ISSN1996-1073
DOIs
Publication statusPublished - Jan 2018
Externally publishedYes

Fingerprint

Microgrid
Transient Analysis
Synchronous generators
Stability Analysis
Generator
Damping
Inertia
System stability
Unstable
Local Power
Inverter
Parameter Design
Mathematical Modeling
Time Domain
Theoretical Analysis
Costs
Oscillation
Grid
Eigenvalue
Coefficient

Keywords

  • microgrid
  • island
  • virtual synchronous generator (VSG)
  • stability
  • parameters design

Cite this

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title = "Transient Stability Analysis of Islanded AC Microgrids with a Significant Share of Virtual Synchronous Generators",
abstract = "As an advanced control method that could bring extra inertia and damping characteristics to inverter-based distributed generators, the virtual synchronous generator (VSG) has recently drawn considerable attention. VSGs are expected to enhance the frequency regulation capability of the local power grid, especially the AC microgrid in island mode. However, the cost of that performance promotion is potential instability. In this paper, the unstable phenomena of the islanded microgrid dominated by SGs and distributed generators (DSs) are addressed after mathematical modeling and detailed eigenvalue analyses respectively. The influence of VSG key parameters, e.g., virtual inertia, damping factor, and droop coefficient on system stability is investigated, and the corresponding mathematical calculation method of unstable region is obtained. The theoretical analysis is well supported by time domain simulation results. The predicted frequency oscillation suggests the consideration of stability constrain during the VSG parameters design procedure.",
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Transient Stability Analysis of Islanded AC Microgrids with a Significant Share of Virtual Synchronous Generators. / Yuan, Chang; Xie, Peilin; Yang, Dan; Xiao, Xiangning.

In: Energies, Vol. 11, No. 1, 44, 01.2018, p. 1-19.

Research output: Contribution to journalJournal articleResearchpeer-review

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AU - Yang, Dan

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Y1 - 2018/1

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AB - As an advanced control method that could bring extra inertia and damping characteristics to inverter-based distributed generators, the virtual synchronous generator (VSG) has recently drawn considerable attention. VSGs are expected to enhance the frequency regulation capability of the local power grid, especially the AC microgrid in island mode. However, the cost of that performance promotion is potential instability. In this paper, the unstable phenomena of the islanded microgrid dominated by SGs and distributed generators (DSs) are addressed after mathematical modeling and detailed eigenvalue analyses respectively. The influence of VSG key parameters, e.g., virtual inertia, damping factor, and droop coefficient on system stability is investigated, and the corresponding mathematical calculation method of unstable region is obtained. The theoretical analysis is well supported by time domain simulation results. The predicted frequency oscillation suggests the consideration of stability constrain during the VSG parameters design procedure.

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