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The building is the largest consumer of energy, before the transport and industry. It also accounts for 25% of emissions of carbon dioxide on the national level, it consumes a lot of energy for the production of domestic hot water (DHW) and the heat and cold production. For this reason, the building is considered a huge reservoir of potential energy savings, hence the existence of numerous research studies on this topic, [1]. So to reduce this consumption we thought to integrate renewable sources of energy (RES) using a control strategy of DC building. The objective of this paper is to present a model of a building equipped with RES, different electrical loads, and behavior of the energy consumption of a building in real time using multi-physics description software package known as Simscape and we propose also a 230V DC microgrid which consists of a 20 KWp photovoltaic panel, batteries and DC loads and also a hierarchical control strategy to ensure balance power of the DC microgrid and the maintenance of common DC bus voltage is presented.