Interaction of MV- and LV-automation systems for a smart distribution grid

Abstract

The electrical energy sector is in a fundamental changing process. The integration of decentral renewable power plant and new electrical devices, like electrical vehicles, cause critical situations in the distribution grid. Smart grid systems can solve these situations. Nowadays there are smart grid solutions for the medium or the low voltage level. These systems work decentral (semi-) autarkic and consider only one single voltage level although there are huge interdependencies between the different levels. For this reason, this paper starts with the approach to build up a holistic smart grid system for the complete distribution grid. As a first step, the interactions between medium and low voltage smart grid systems are shown in this paper. Especially the ability of the low voltage system to be an aggregated medium voltage actuator is presented. The low voltage smart grid system aggregates all actuators for the medium voltage and provides reliable actuator flexibility. It will be shown, that the combination of both LV- and MV-systems in a holistic smart distribution grid will open up huge synergy effects.