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Abstract. This research has as main objective to analyze the contributions of a distributed generation unit when connected to a medium voltage distribution feeder (13.8 kV). The behaviour this electrical system is evaluated following the occurrence of some disturbances. Before this, all the modelling of the electrical system was performed using ATP -Alternative Transients Program. Three types of disturbances were simulated: phase-toground short-circuit, islanding of part of the electrical system and load increase on the feeder. To easy the comparisons, all studies were carried out with and without the presence of the distributed generator taking into account the following variables: busbar voltage profile, output power provided by the substation and by the distributed generator when present.

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The DC electric energy transmission has shown to be an attractive solution for many applications. In the last few years, the multiterminal arrangement has assumed a relevant position facing the growing necessity of the main grid. Although a great deal of development has been made for parallel schemes, there is not much information and experience in literature conming series multiterminal DC transmission systems. Thus, this paper aims to present the results of studies to establish a control strategy for such systems, as well as the implementation into a transient stability program. Study results using a typical system are presented and discussed in order to verify the proposed model performance.