SHORT-CIRCUIT PERFORMANCE FOR LINE-TO-LINE AND DOUBLE LINE-TO-GROUND FAULTS IN A SYNCHRONVERTER-BASED MICROGRID

Abstract

Most microgrids are based on generation units dominated by power electronics. This has led to a reduction in rotational inertia in modern electrical systems, posing a challenge to ensuring their stability in the event of disturbances. This article presents a study of the dynamic response and steady-state behavior of an AC microgrid connected to the grid. The research focuses on comparing the dynamic response of this microgrid when subjected to temporary line-to-line and double line-to-ground short-circuit events with the gradual incorporation of synchronous converters. The study was carried out and simulated in Matlab/Simulink. The results show that, with the incorporation of virtual inertia generated by the synchronous converter, the dynamics of the analysis variables such as voltage, current, active power, and frequency perform better and more closely resemble a system dominated by synchronous generators. Thus, the synchronous converter model for incorporating virtual inertia has proven to be an effective solution to the challenges arising from low-inertia systems.