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Dynamic Stability Analysis of Synchronverter-Dominated Microgrid Based on Bifurcation Theory

Dynamic Stability Analysis of Synchronverter-Dominated Microgrid Based on Bifurcation Theory

Dynamic Stability Analysis of Synchronverter-Dominated Microgrid Based on Bifurcation Theory

 

Abstract—

In the traditional power grid, inverter-interfaced distributed energy resources (DERs) are widely used in microgrids such as conventional synchronous generators (SGs) in the traditional power grid. They are expected to decrease the rotational inertia and spinning reserve capacity that are specific to SGs, while synchronverters can compensate for the loss. Thus, an increasing number of interfaced inverters may act as synchronverters in a microgrid. The dynamic stability of the synchronverter-dominated microgrid must thus be
carefully evaluated to ensure the reliable operation of this type of system. This paper presents a nonlinear model of a synchronverter-dominated microgrid. The eigenvalues of
the system state matrix, along with the participation factors, are analyzed to determine the predominant parameters affecting the stability. Bifurcation theory is then used to predict and describe the unstable phenomenon as the system parameters fluctuate; the effect of these parameters on the system stability is then examined. A simulation on Matlab/Simulink and experiments were performed and results validated the presented analysis.

 

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