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Energies 2018, 11(1), 44; doi:10.3390/en11010044

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

State Key Laboratory for Alternate Electrical Power System with Renewable Energy Source, North China Electric Power University, Beijing 102206, China
Author to whom correspondence should be addressed.
Received: 16 November 2017 / Revised: 16 December 2017 / Accepted: 19 December 2017 / Published: 1 January 2018


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. View Full-Text
Keywords: microgrid; island; virtual synchronous generator (VSG); stability; parameters design microgrid; island; virtual synchronous generator (VSG); stability; parameters design

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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Yuan, C.; Xie, P.; Yang, D.; Xiao, X. Transient Stability Analysis of Islanded AC Microgrids with a Significant Share of Virtual Synchronous Generators. Energies 2018, 11, 44.

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