LV DC distribution network with distributed energy resources: Analysis of possible structures

The attention of the end users to the electric power quality problem, the widespread use of the electronic power converters and the need to integrate the new distributed generation and storage systems have increased the interest in considering a public distribution system in direct current. The main idea is to extend the DC section, nowadays present in many electric devices, distributed generation systems and uninterruptible power supplies, at the level of LV public distribution. In this way it would be possible to create an high quality electric island that achieves also the advantages of the number and the complexity reduction of the power converters connected to the distribution network and a greater energy transport capacity with the same conductors [1]. In the present paper some possible circuital configurations are analyzed both from the technical and the economical points of view. Moreover, some remarks related to electrical safety have been presented. Finally, some simulation results are given. This paper was developed within the activity "Ricerca di Sistema" (DM 28/02/2003).