Dynamic modeling and transient stability analysis of distributed generators in a microgrid system

Hamed Ahmadi, Qobad Shafiee, Hassan Bevrani

Abstract


Increasing the penetration level of distributed generation units as well as power electronic devices adds more complexity and variability to the dynamic behaviour of the microgrids. For such systems, studying the transient modelling and stability is essential. One of the major disadvantages of most studies on microgrid modelling is their excessive attention to the steady state period and the lack of attention to microgrid performance during the transient period. In most of the research works, the behaviour of different microgrid loads has not been studied. One of the mechanisms of power systems stability studies is the application of state space modelling. This paper presents a mathematical model for connected inverters in microgrid systems with many variations of operating conditions. Nonlineal tools, phase-plane trajectory analysis, and Lyapunov method were employed to evaluate the limits of small signal models. Based on the results of the present study, applying the model allows for the analysis of the system when subjected to a severe transient disturbance such as loss of large load or generation. Studying the transient stability of microgrid systems in the stand-alone utility grid is useful and necessary for improving the design of the microgrid’s architecture.

Keywords


method of lyapunov; microgrid model; nonlinear model; transient stability;



DOI: http://doi.org/10.11591/ijece.v11i5.pp%25p

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International Journal of Electrical and Computer Engineering (IJECE)
p-ISSN 2088-8708, e-ISSN 2722-2578