The today Energy system is characterized by the more and more growth and diffusion of the various distributed energy renewable sources in the generation and distribution level, such as wind and solar, are marked by the intermittent and variable generation. Moreover, now the customer can become a prosumer, it is no longer the last in the hierarchical order of the energy system, it can produce energy for itself and also feed the grid, so now need to be more integrated and in touch with the grid system. These aspects bring the necessity to evolve the actual power grid system that can't handle those changes.